<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:8441a9e9-2216-43aa-a200-70347edeab05,g:57dd14ca-5be6-4a31-9688-4c7b0b3c4c31-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.jackhenry.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="jkhy-20220630.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended" id="i9699e3576e3e429896d6f9dd941e9abd_CONSOLIDATEDBALANCESHEETS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_018c0f96-ddc3-4b34-af68-803a24453757" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_28267730-6ddb-42c4-8986-8624b659ba0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_018c0f96-ddc3-4b34-af68-803a24453757" xlink:to="loc_us-gaap_AssetsAbstract_28267730-6ddb-42c4-8986-8624b659ba0a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_28267730-6ddb-42c4-8986-8624b659ba0a" xlink:to="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_0f19d28d-a0a0-41d7-bedd-edac7b9a69c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_0f19d28d-a0a0-41d7-bedd-edac7b9a69c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_2c2c6643-8fdc-41cd-a185-ecd64430929b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_2c2c6643-8fdc-41cd-a185-ecd64430929b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivable_fbfa2f83-1473-4385-8b6e-7be73d81267a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_IncomeTaxesReceivable_fbfa2f83-1473-4385-8b6e-7be73d81267a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_263a3d62-655d-47c0-b1e6-c9db6e440419" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_263a3d62-655d-47c0-b1e6-c9db6e440419" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsCurrent_f65d8946-db2a-416c-9bb2-ad4e04d636c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCostsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_DeferredCostsCurrent_f65d8946-db2a-416c-9bb2-ad4e04d636c0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_023ffd01-4959-440e-9c91-04ff0db547bc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_023ffd01-4959-440e-9c91-04ff0db547bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_55de5778-c966-493a-9f9d-38307f436b3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d0af2df3-3e6d-4109-af8a-09d2707cdd1f" xlink:to="loc_us-gaap_AssetsCurrent_55de5778-c966-493a-9f9d-38307f436b3b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_3343b5ff-cd3a-4bf5-a76c-4ca46f2b644a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_28267730-6ddb-42c4-8986-8624b659ba0a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_3343b5ff-cd3a-4bf5-a76c-4ca46f2b644a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_28267730-6ddb-42c4-8986-8624b659ba0a" xlink:to="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCosts_6521b1ea-daee-44c0-b123-4a2c4202fde2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_DeferredCosts_6521b1ea-daee-44c0-b123-4a2c4202fde2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_f32c52ef-61cf-4ed5-9b8c-56351542acd1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_f32c52ef-61cf-4ed5-9b8c-56351542acd1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_4f50cdaf-0b5e-4ac9-9903-094b92eb5ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_4f50cdaf-0b5e-4ac9-9903-094b92eb5ae5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8535587f-8e04-44d8-9d7f-b36fff5e5c9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8535587f-8e04-44d8-9d7f-b36fff5e5c9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_324b4287-c9db-4d01-9754-e9f7b34ab4be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_324b4287-c9db-4d01-9754-e9f7b34ab4be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_1c94a8c4-5e12-4429-b228-9ac5fdb5eb46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_Goodwill_1c94a8c4-5e12-4429-b228-9ac5fdb5eb46" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_2004ec23-26ba-48e4-a1d5-ba21cc73b727" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_AssetsNoncurrent_2004ec23-26ba-48e4-a1d5-ba21cc73b727" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_bde5c2a8-048f-42d2-841e-63ca8e4013d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_dc21c7a3-244e-41bc-935d-81b433ff8b9c" xlink:to="loc_us-gaap_Assets_bde5c2a8-048f-42d2-841e-63ca8e4013d9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3680c743-c789-4e15-836e-fb26ae38080e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_018c0f96-ddc3-4b34-af68-803a24453757" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3680c743-c789-4e15-836e-fb26ae38080e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3680c743-c789-4e15-836e-fb26ae38080e" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_6eafed90-c0fd-4ad1-a422-b7cbdba7c33e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:to="loc_us-gaap_AccountsPayableCurrent_6eafed90-c0fd-4ad1-a422-b7cbdba7c33e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_bc583d9a-1bfc-494b-92d1-9e1d8f776af5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_bc583d9a-1bfc-494b-92d1-9e1d8f776af5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_a2995c45-da00-417e-9d4c-33531b3ae997" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:to="loc_us-gaap_NotesPayableCurrent_a2995c45-da00-417e-9d4c-33531b3ae997" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_eace8c67-a178-4774-b24d-0101f3961049" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_eace8c67-a178-4774-b24d-0101f3961049" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_2eb1654e-7824-40be-97b2-01b5b8abb9e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_8e8ff48d-2c71-4e74-8067-9c60c50396af" xlink:to="loc_us-gaap_LiabilitiesCurrent_2eb1654e-7824-40be-97b2-01b5b8abb9e6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3680c743-c789-4e15-836e-fb26ae38080e" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e15a74f0-85ff-4e7b-a593-7bfdd2697389" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_e15a74f0-85ff-4e7b-a593-7bfdd2697389" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_c313a281-2669-40c7-89ae-bd018f8cdf4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_c313a281-2669-40c7-89ae-bd018f8cdf4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_c7d97bb4-741e-424b-ac8c-afe6197868a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_c7d97bb4-741e-424b-ac8c-afe6197868a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_2f8a9052-6253-4141-9538-bca70f18d06a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_2f8a9052-6253-4141-9538-bca70f18d06a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_e324796a-9996-4a3a-8174-722c688e4c29" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_e324796a-9996-4a3a-8174-722c688e4c29" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_f1062bf5-8031-41e0-9c38-c6330b750c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6636f9cd-3e74-4b4f-b23f-84eb9ee64007" xlink:to="loc_us-gaap_Liabilities_f1062bf5-8031-41e0-9c38-c6330b750c2f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3680c743-c789-4e15-836e-fb26ae38080e" xlink:to="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_2ea8b8f5-ce2f-4ca2-8fab-305eba927e27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_2ea8b8f5-ce2f-4ca2-8fab-305eba927e27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_6afd2fbb-b2f7-4b24-8b95-5e52a80eacfe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_6afd2fbb-b2f7-4b24-8b95-5e52a80eacfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_980e7147-b9b6-47c8-beda-c47c1d0d751a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_PreferredStockSharesIssued_980e7147-b9b6-47c8-beda-c47c1d0d751a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_2d7184bd-694a-4526-b693-d0cbe5c72e94" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_PreferredStockValue_2d7184bd-694a-4526-b693-d0cbe5c72e94" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_226bd4e7-5abe-4c3c-bdcc-c16369a06408" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_226bd4e7-5abe-4c3c-bdcc-c16369a06408" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_0e4d68a2-760e-4d4c-a380-67c8a531b6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_0e4d68a2-760e-4d4c-a380-67c8a531b6d4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_2a089682-004b-4d36-bd60-e16d9fe8a76a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_CommonStockSharesIssued_2a089682-004b-4d36-bd60-e16d9fe8a76a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_5c413fa8-c34f-484d-b32c-a8842600930f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_CommonStockValue_5c413fa8-c34f-484d-b32c-a8842600930f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_bc271ae7-8b3b-450e-8a45-a85618939957" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_AdditionalPaidInCapital_bc271ae7-8b3b-450e-8a45-a85618939957" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_be842618-b422-4da8-8f9f-33ced533aa0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_be842618-b422-4da8-8f9f-33ced533aa0f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockShares_bda016c5-b5d0-4bcb-8aa6-782eb55f3a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_TreasuryStockShares_bda016c5-b5d0-4bcb-8aa6-782eb55f3a1f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_7c04f7b5-3a47-4399-a8f9-c847e90770b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_TreasuryStockValue_7c04f7b5-3a47-4399-a8f9-c847e90770b8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_a955c30a-5061-4e16-8be1-447381180ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_StockholdersEquity_a955c30a-5061-4e16-8be1-447381180ea2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_63f20282-8088-41da-8414-9808ca750a5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_5a511473-a8b6-4045-bfd5-8415279440c1" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_63f20282-8088-41da-8414-9808ca750a5b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_83a4f241-3e89-4841-b837-c47370370405" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_018c0f96-ddc3-4b34-af68-803a24453757" xlink:to="loc_us-gaap_StatementTable_83a4f241-3e89-4841-b837-c47370370405" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6c8e7a6b-184e-40d7-8963-58aa583d5c0b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_83a4f241-3e89-4841-b837-c47370370405" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6c8e7a6b-184e-40d7-8963-58aa583d5c0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6c8e7a6b-184e-40d7-8963-58aa583d5c0b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6c8e7a6b-184e-40d7-8963-58aa583d5c0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6c8e7a6b-184e-40d7-8963-58aa583d5c0b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_37d1d578-957b-440f-bd72-5ad241d006ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6c8e7a6b-184e-40d7-8963-58aa583d5c0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_37d1d578-957b-440f-bd72-5ad241d006ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_9ee4fb46-54aa-4efc-bd4b-3223f882d192" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_37d1d578-957b-440f-bd72-5ad241d006ba" xlink:to="loc_us-gaap_CustomerRelationshipsMember_9ee4fb46-54aa-4efc-bd4b-3223f882d192" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_612eaacb-0853-4014-8395-f0bc27727bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_83a4f241-3e89-4841-b837-c47370370405" xlink:to="loc_us-gaap_DebtInstrumentAxis_612eaacb-0853-4014-8395-f0bc27727bcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_612eaacb-0853-4014-8395-f0bc27727bcd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_612eaacb-0853-4014-8395-f0bc27727bcd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_612eaacb-0853-4014-8395-f0bc27727bcd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_c88c0fe6-5215-4927-9e4a-0110d462fa5a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_612eaacb-0853-4014-8395-f0bc27727bcd" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_c88c0fe6-5215-4927-9e4a-0110d462fa5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_3e304784-cf89-48a0-8a16-e2567f2cbe7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_c88c0fe6-5215-4927-9e4a-0110d462fa5a" xlink:to="loc_us-gaap_UnsecuredDebtMember_3e304784-cf89-48a0-8a16-e2567f2cbe7e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITY" xlink:type="simple" xlink:href="jkhy-20220630.xsd#CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITY"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITY" xlink:type="extended" id="i17c3422130854c8c8870a2521cfcda96_CONSOLIDATEDSTATEMENTSOFCHANGESINSTOCKHOLDERSEQUITY">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_24c6a798-f8b6-4694-9f73-39fe79a3a8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_24c6a798-f8b6-4694-9f73-39fe79a3a8e6" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_04bd72d5-a5ad-4d62-ae2a-2fe44e3d467c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_04bd72d5-a5ad-4d62-ae2a-2fe44e3d467c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_613f298b-bddb-4f08-bb72-19259d5c9362" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_StockholdersEquity_613f298b-bddb-4f08-bb72-19259d5c9362" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_f1a66708-47b8-4216-93c6-dc71087e225c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_f1a66708-47b8-4216-93c6-dc71087e225c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_f0f18ea5-ec4f-4cd1-b54c-d31770b93796" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_f0f18ea5-ec4f-4cd1-b54c-d31770b93796" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2846a81b-f543-438f-b3d6-00f76efa01a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_2846a81b-f543-438f-b3d6-00f76efa01a7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_1866e847-8cdb-45c9-97b9-fce2145dc9d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_1866e847-8cdb-45c9-97b9-fce2145dc9d8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_f44fa8e8-e94d-4633-a744-10af0a91129f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_f44fa8e8-e94d-4633-a744-10af0a91129f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_f1a2a451-5f3b-4bfd-af1e-5dfd9d62aa17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_f1a2a451-5f3b-4bfd-af1e-5dfd9d62aa17" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7eaaa3ca-9ce1-4615-929d-88876ecc45f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_7eaaa3ca-9ce1-4615-929d-88876ecc45f1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_35cde51f-ff1e-48d5-a479-21a9bb595406" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_NetIncomeLoss_35cde51f-ff1e-48d5-a479-21a9bb595406" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_7034fe39-54e2-4fab-a181-1906746f0f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_DividendsCommonStock_7034fe39-54e2-4fab-a181-1906746f0f2d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_ecd19a82-a908-4b44-9bc2-8abcc12ff701" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_0c2bfc6c-79ce-4bea-9f88-8abe62865e63" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_ecd19a82-a908-4b44-9bc2-8abcc12ff701" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_4c2a67e9-ce16-487e-b3ce-94440da702a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_5a16d130-4ad7-415f-b436-94651456c3ca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_a8f9aba5-6b84-443a-8b03-5de5de60e161" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_24c6a798-f8b6-4694-9f73-39fe79a3a8e6" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_a8f9aba5-6b84-443a-8b03-5de5de60e161" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b478bf06-594f-4d93-910a-929782584ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_24c6a798-f8b6-4694-9f73-39fe79a3a8e6" xlink:to="loc_us-gaap_StatementTable_b478bf06-594f-4d93-910a-929782584ba8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_7d7ed31d-0825-4213-b665-01cff84756fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b478bf06-594f-4d93-910a-929782584ba8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_7d7ed31d-0825-4213-b665-01cff84756fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7d7ed31d-0825-4213-b665-01cff84756fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7d7ed31d-0825-4213-b665-01cff84756fc" xlink:to="loc_us-gaap_EquityComponentDomain_7d7ed31d-0825-4213-b665-01cff84756fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7d7ed31d-0825-4213-b665-01cff84756fc" xlink:to="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_0425eb09-d004-4e08-b0a4-5d4a6530b384" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:to="loc_us-gaap_PreferredStockMember_0425eb09-d004-4e08-b0a4-5d4a6530b384" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_b8e4d5aa-17b3-4c0b-86ba-4d6f079513fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:to="loc_us-gaap_CommonStockMember_b8e4d5aa-17b3-4c0b-86ba-4d6f079513fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_0b658761-d258-4314-a44e-0931f9a75193" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_0b658761-d258-4314-a44e-0931f9a75193" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_386567a7-c482-4830-a806-a6c0950adfca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:to="loc_us-gaap_RetainedEarningsMember_386567a7-c482-4830-a806-a6c0950adfca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_6a474dba-2f1d-4ddb-9b4a-a5afb475e48f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a3163955-fb83-4efd-95c2-024e61c503ed" xlink:to="loc_us-gaap_TreasuryStockMember_6a474dba-2f1d-4ddb-9b4a-a5afb475e48f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_aa802d2b-359b-4343-9646-949d5587a81b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b478bf06-594f-4d93-910a-929782584ba8" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_aa802d2b-359b-4343-9646-949d5587a81b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_aa802d2b-359b-4343-9646-949d5587a81b_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_aa802d2b-359b-4343-9646-949d5587a81b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_aa802d2b-359b-4343-9646-949d5587a81b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_31dbe941-b8b0-4107-9ee9-ec2da156c994" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_aa802d2b-359b-4343-9646-949d5587a81b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_31dbe941-b8b0-4107-9ee9-ec2da156c994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate201613Member_67c4df27-371f-4fa1-8d22-3b126d10a8ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate201613Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_31dbe941-b8b0-4107-9ee9-ec2da156c994" xlink:to="loc_us-gaap_AccountingStandardsUpdate201613Member_67c4df27-371f-4fa1-8d22-3b126d10a8ba" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#NatureofOperationsandSummaryofSignificantAccountingPoliciesAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesAllowanceforCreditLossesDetails" xlink:type="extended" id="iba8b4c02662641e480f8f9f11d2b465f_NatureofOperationsandSummaryofSignificantAccountingPoliciesAllowanceforCreditLossesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_8aa052b1-1d33-4517-8349-669f22f6b9d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8aa052b1-1d33-4517-8349-669f22f6b9d1" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_d30e91b9-8e32-4ba3-b0af-e86f5cdda406" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_d30e91b9-8e32-4ba3-b0af-e86f5cdda406" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease_d4de0d35-07a5-4534-873b-2412a9b71935" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease_d4de0d35-07a5-4534-873b-2412a9b71935" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_f4a9e20a-1d76-44b5-94ad-c85b4a2f0043" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_f4a9e20a-1d76-44b5-94ad-c85b4a2f0043" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries_a11171e9-99e2-41d4-99e1-09fe34f238c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries_a11171e9-99e2-41d4-99e1-09fe34f238c1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_de3f28f4-ed5a-4fd2-a344-5715825ea3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_1a25daaa-4f2b-4158-8b6c-0a9bcb1b4268" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_de3f28f4-ed5a-4fd2-a344-5715825ea3d2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_d4e09986-1f31-476a-8a4f-2967b440e60a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_0ccac9ff-8a93-415b-a11b-5a32cdf07122" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8aa052b1-1d33-4517-8349-669f22f6b9d1" xlink:to="loc_us-gaap_StatementTable_0ccac9ff-8a93-415b-a11b-5a32cdf07122" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_27b125c0-d633-42e9-a934-86c5bc67aef7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0ccac9ff-8a93-415b-a11b-5a32cdf07122" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_27b125c0-d633-42e9-a934-86c5bc67aef7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_27b125c0-d633-42e9-a934-86c5bc67aef7_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_27b125c0-d633-42e9-a934-86c5bc67aef7" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_27b125c0-d633-42e9-a934-86c5bc67aef7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_7286a838-d39a-4b0f-b258-0f4e67e851b9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_27b125c0-d633-42e9-a934-86c5bc67aef7" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_7286a838-d39a-4b0f-b258-0f4e67e851b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate201613Member_48edf61f-b533-4306-8d2c-ed5b7e71c619" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountingStandardsUpdate201613Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_7286a838-d39a-4b0f-b258-0f4e67e851b9" xlink:to="loc_us-gaap_AccountingStandardsUpdate201613Member_48edf61f-b533-4306-8d2c-ed5b7e71c619" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentDetails" xlink:type="extended" id="i85d8488fcbc44599b2cf8d4d1fb1d4a5_NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems_597e49d2-f22b-4cdf-adbc-2618208e6358" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtCost_2c0a2b05-6573-447f-b74f-98f08e6ab781" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InvestmentOwnedAtCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems_597e49d2-f22b-4cdf-adbc-2618208e6358" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_2c0a2b05-6573-447f-b74f-98f08e6ab781" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCostMethodInvestmentsTable_70b36c20-3716-4df9-9d38-4c747cdd5811" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfCostMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueLineItems_597e49d2-f22b-4cdf-adbc-2618208e6358" xlink:to="loc_us-gaap_ScheduleOfCostMethodInvestmentsTable_70b36c20-3716-4df9-9d38-4c747cdd5811" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eaa07e97-3e66-46b1-ab3c-dcd7d2b12825" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCostMethodInvestmentsTable_70b36c20-3716-4df9-9d38-4c747cdd5811" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eaa07e97-3e66-46b1-ab3c-dcd7d2b12825" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_eaa07e97-3e66-46b1-ab3c-dcd7d2b12825_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eaa07e97-3e66-46b1-ab3c-dcd7d2b12825" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_eaa07e97-3e66-46b1-ab3c-dcd7d2b12825_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_a6090516-1456-4227-abf4-0accbfb4296a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_eaa07e97-3e66-46b1-ab3c-dcd7d2b12825" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_a6090516-1456-4227-abf4-0accbfb4296a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AutomatedBookkeepingInc.Member_f2d57924-ca8e-4973-b788-69158dc5832a" xlink:href="jkhy-20220630.xsd#jkhy_AutomatedBookkeepingInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_a6090516-1456-4227-abf4-0accbfb4296a" xlink:to="loc_jkhy_AutomatedBookkeepingInc.Member_f2d57924-ca8e-4973-b788-69158dc5832a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_63697e30-a51b-4081-b72c-b73d29cc5ade" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCostMethodInvestmentsTable_70b36c20-3716-4df9-9d38-4c747cdd5811" xlink:to="loc_us-gaap_FinancialInstrumentAxis_63697e30-a51b-4081-b72c-b73d29cc5ade" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_63697e30-a51b-4081-b72c-b73d29cc5ade_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_63697e30-a51b-4081-b72c-b73d29cc5ade" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_63697e30-a51b-4081-b72c-b73d29cc5ade_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1b1b9ecc-cb0d-49b6-b4d7-4662ac2da306" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_63697e30-a51b-4081-b72c-b73d29cc5ade" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1b1b9ecc-cb0d-49b6-b4d7-4662ac2da306" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_990961e1-4b35-4053-a346-caef2e38fb26" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1b1b9ecc-cb0d-49b6-b4d7-4662ac2da306" xlink:to="loc_us-gaap_PreferredStockMember_990961e1-4b35-4053-a346-caef2e38fb26" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RevenueandDeferredCostsNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#RevenueandDeferredCostsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RevenueandDeferredCostsNarrativeDetails" xlink:type="extended" id="i57899e45c0ee42898440da685c74baf9_RevenueandDeferredCostsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_83961916-b391-4f31-9511-b7e0d7d94ea7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_83961916-b391-4f31-9511-b7e0d7d94ea7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_f39b9622-37b0-420d-b19f-f182b0c6179f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_f39b9622-37b0-420d-b19f-f182b0c6179f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_c3f0d009-ab8c-4afc-89ab-9276d6540a06" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_c3f0d009-ab8c-4afc-89ab-9276d6540a06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7a61908a-183e-45e2-8216-55aa064d54d6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7a61908a-183e-45e2-8216-55aa064d54d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_945fbd37-6687-4cf0-b05c-09ff4d95660f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7a61908a-183e-45e2-8216-55aa064d54d6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_945fbd37-6687-4cf0-b05c-09ff4d95660f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RevenueandDeferredCostsNarrativeDetails_1" xlink:type="simple" xlink:href="jkhy-20220630.xsd#RevenueandDeferredCostsNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RevenueandDeferredCostsNarrativeDetails_1" xlink:type="extended" id="i981df95617af4deaaab920c0ad023ca0_RevenueandDeferredCostsNarrativeDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_83961916-b391-4f31-9511-b7e0d7d94ea7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_83961916-b391-4f31-9511-b7e0d7d94ea7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_f39b9622-37b0-420d-b19f-f182b0c6179f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_f39b9622-37b0-420d-b19f-f182b0c6179f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_c3f0d009-ab8c-4afc-89ab-9276d6540a06" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_c3f0d009-ab8c-4afc-89ab-9276d6540a06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7a61908a-183e-45e2-8216-55aa064d54d6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_90ce770d-17ef-4698-826e-98092225e47d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_7a61908a-183e-45e2-8216-55aa064d54d6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/DisaggregationofRevenueDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#DisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/DisaggregationofRevenueDetails" xlink:type="extended" id="i8778cfb25e5449f68ca57bc92946135d_DisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_a6c210de-ae65-4daa-8df0-f15b387f51ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_7dbc9251-1b0a-4e5c-83ef-993eab7ae652" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a6c210de-ae65-4daa-8df0-f15b387f51ef" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_7dbc9251-1b0a-4e5c-83ef-993eab7ae652" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_9080962b-bbff-4007-b31f-7de68f824485" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a6c210de-ae65-4daa-8df0-f15b387f51ef" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_9080962b-bbff-4007-b31f-7de68f824485" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_199fcf95-acd1-4062-a705-dcd21971fcdb" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_9080962b-bbff-4007-b31f-7de68f824485" xlink:to="loc_srt_ProductOrServiceAxis_199fcf95-acd1-4062-a705-dcd21971fcdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_199fcf95-acd1-4062-a705-dcd21971fcdb_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_199fcf95-acd1-4062-a705-dcd21971fcdb" xlink:to="loc_srt_ProductsAndServicesDomain_199fcf95-acd1-4062-a705-dcd21971fcdb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_199fcf95-acd1-4062-a705-dcd21971fcdb" xlink:to="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_OutsourcingCloudMember_d062821d-12b7-4cfb-9c02-d1e28e31cceb" xlink:href="jkhy-20220630.xsd#jkhy_OutsourcingCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:to="loc_jkhy_OutsourcingCloudMember_d062821d-12b7-4cfb-9c02-d1e28e31cceb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ProductDeliveryandServiceMember_9e3c6221-550f-4b9c-b5e4-39f769aa3111" xlink:href="jkhy-20220630.xsd#jkhy_ProductDeliveryandServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:to="loc_jkhy_ProductDeliveryandServiceMember_9e3c6221-550f-4b9c-b5e4-39f769aa3111" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_InHouseSupportMember_1822642c-8960-4338-a440-8aef198632e5" xlink:href="jkhy-20220630.xsd#jkhy_InHouseSupportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:to="loc_jkhy_InHouseSupportMember_1822642c-8960-4338-a440-8aef198632e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndServiceMember_dbaa0f6c-3c30-4cbb-838c-13a67999d8b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LicenseAndServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:to="loc_us-gaap_LicenseAndServiceMember_dbaa0f6c-3c30-4cbb-838c-13a67999d8b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ProcessingMember_36a75722-f9d9-4d5d-b4fd-eec29df2a659" xlink:href="jkhy-20220630.xsd#jkhy_ProcessingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_158d6ac0-a312-4789-a9d8-444fdf954ad4" xlink:to="loc_jkhy_ProcessingMember_36a75722-f9d9-4d5d-b4fd-eec29df2a659" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/FairValueMeasuresandDisclosuresDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#FairValueMeasuresandDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/FairValueMeasuresandDisclosuresDetails" xlink:type="extended" id="idfaa86e20b734f38b179e5aecab9227f_FairValueMeasuresandDisclosuresDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a3008f72-c58e-440f-b603-5a2a63db9974" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_11505e79-b3fc-46c6-82eb-171b54e8c928" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a3008f72-c58e-440f-b603-5a2a63db9974" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_11505e79-b3fc-46c6-82eb-171b54e8c928" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditFairValueDisclosure_9c8846bc-2c4d-471c-aa2b-1cc87176f184" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LinesOfCreditFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a3008f72-c58e-440f-b603-5a2a63db9974" xlink:to="loc_us-gaap_LinesOfCreditFairValueDisclosure_9c8846bc-2c4d-471c-aa2b-1cc87176f184" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e76caf33-b6e4-4c1e-a1f8-59a1545480c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_a3008f72-c58e-440f-b603-5a2a63db9974" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e76caf33-b6e4-4c1e-a1f8-59a1545480c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_6f60d1bb-e979-4d58-977e-3a2a85845966" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e76caf33-b6e4-4c1e-a1f8-59a1545480c6" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_6f60d1bb-e979-4d58-977e-3a2a85845966" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_6f60d1bb-e979-4d58-977e-3a2a85845966_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_6f60d1bb-e979-4d58-977e-3a2a85845966" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_6f60d1bb-e979-4d58-977e-3a2a85845966_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_493c6ef4-fb99-4a1c-9c7d-eb587cc216df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_6f60d1bb-e979-4d58-977e-3a2a85845966" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_493c6ef4-fb99-4a1c-9c7d-eb587cc216df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_2cbb3d08-5576-4568-ad42-979cb2a39c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CertificatesOfDepositMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_493c6ef4-fb99-4a1c-9c7d-eb587cc216df" xlink:to="loc_us-gaap_CertificatesOfDepositMember_2cbb3d08-5576-4568-ad42-979cb2a39c4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2d8f11b5-0582-43ba-a5d0-fc175132de6b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_493c6ef4-fb99-4a1c-9c7d-eb587cc216df" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_2d8f11b5-0582-43ba-a5d0-fc175132de6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dd140c0-5ba3-4fb5-9fc1-e6f674a17983" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e76caf33-b6e4-4c1e-a1f8-59a1545480c6" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dd140c0-5ba3-4fb5-9fc1-e6f674a17983" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9dd140c0-5ba3-4fb5-9fc1-e6f674a17983_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dd140c0-5ba3-4fb5-9fc1-e6f674a17983" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9dd140c0-5ba3-4fb5-9fc1-e6f674a17983_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_066df6da-50e3-4faf-b1e6-4eca74d4538c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dd140c0-5ba3-4fb5-9fc1-e6f674a17983" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_066df6da-50e3-4faf-b1e6-4eca74d4538c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_46c5291a-7a55-48d3-bcc8-305a1c84f18e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_066df6da-50e3-4faf-b1e6-4eca74d4538c" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_46c5291a-7a55-48d3-bcc8-305a1c84f18e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_42797613-8fc7-432c-ad50-5e7810b2d04c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_066df6da-50e3-4faf-b1e6-4eca74d4538c" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_42797613-8fc7-432c-ad50-5e7810b2d04c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_8188b20b-1060-4061-9dc7-78db684a370c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_066df6da-50e3-4faf-b1e6-4eca74d4538c" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_8188b20b-1060-4061-9dc7-78db684a370c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1b8dfd87-eaeb-4380-81b1-3231e9d8d1db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_e76caf33-b6e4-4c1e-a1f8-59a1545480c6" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1b8dfd87-eaeb-4380-81b1-3231e9d8d1db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_1b8dfd87-eaeb-4380-81b1-3231e9d8d1db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1b8dfd87-eaeb-4380-81b1-3231e9d8d1db" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_1b8dfd87-eaeb-4380-81b1-3231e9d8d1db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_ef0a9617-76a2-4f85-830d-e0123292b8ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_1b8dfd87-eaeb-4380-81b1-3231e9d8d1db" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_ef0a9617-76a2-4f85-830d-e0123292b8ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_47f72cc5-2e8f-4b9d-b5d6-baf856527376" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_ef0a9617-76a2-4f85-830d-e0123292b8ac" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_47f72cc5-2e8f-4b9d-b5d6-baf856527376" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/LeasesDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#LeasesDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/LeasesDetails" xlink:type="extended" id="ie219ce516a4645598b21399ddce01627_LeasesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_e8f34e21-0719-419c-8089-f95b4963fd15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_e8f34e21-0719-419c-8089-f95b4963fd15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_53f74fa1-e749-4196-98ed-0064cbe642a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_53f74fa1-e749-4196-98ed-0064cbe642a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_0501c808-cc52-464d-b8ba-90bf8eeb0396" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_0501c808-cc52-464d-b8ba-90bf8eeb0396" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_4064505b-39ea-42b4-b8dd-2da2faa5bbbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseLiability_4064505b-39ea-42b4-b8dd-2da2faa5bbbb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_047fd49b-2593-47ca-b763-5e8b67cae47a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_047fd49b-2593-47ca-b763-5e8b67cae47a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_6cd5f980-344c-4e7f-8d31-d030f0832bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_6cd5f980-344c-4e7f-8d31-d030f0832bb8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_4242dc38-d9da-4db2-acee-df9722dbfe0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseLiability_4242dc38-d9da-4db2-acee-df9722dbfe0d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_c89fd79d-b900-4602-bf30-2fcd627bf4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_c89fd79d-b900-4602-bf30-2fcd627bf4d1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_13f7af0f-82db-44d7-aa46-ac09685ebcbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_13f7af0f-82db-44d7-aa46-ac09685ebcbb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AccumulatedAmortizationOperatingLeaseRightofuseasset_700c64be-2b50-412e-9a59-bec846476933" xlink:href="jkhy-20220630.xsd#jkhy_AccumulatedAmortizationOperatingLeaseRightofuseasset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_jkhy_AccumulatedAmortizationOperatingLeaseRightofuseasset_700c64be-2b50-412e-9a59-bec846476933" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AccumulatedAmortizationFinanceLeaseRightOfUseAsset_4cd5b6b9-bfa3-44b2-9496-630b2cca085a" xlink:href="jkhy-20220630.xsd#jkhy_AccumulatedAmortizationFinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_jkhy_AccumulatedAmortizationFinanceLeaseRightOfUseAsset_4cd5b6b9-bfa3-44b2-9496-630b2cca085a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_f9558038-21f0-4b40-b148-14af55885976" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseCost_f9558038-21f0-4b40-b148-14af55885976" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_fc63ae39-4717-4e06-a3ec-5fd2fe2929d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_fc63ae39-4717-4e06-a3ec-5fd2fe2929d8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_c40d2f41-c30a-49a0-aae3-5f1ab53e3ab4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_VariableLeaseCost_c40d2f41-c30a-49a0-aae3-5f1ab53e3ab4" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_a6a5af25-a383-4bda-bf85-0a7e2892f05f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeasePayments_a6a5af25-a383-4bda-bf85-0a7e2892f05f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_a95dd871-ebf6-43bb-a157-cbb10d0f0062" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_a95dd871-ebf6-43bb-a157-cbb10d0f0062" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquipmentOnLease_5f5874da-0510-4974-8990-6224a554f438" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireEquipmentOnLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_PaymentsToAcquireEquipmentOnLease_5f5874da-0510-4974-8990-6224a554f438" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_54f3a0d9-94f6-4316-a060-24fa1a0c071d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_54f3a0d9-94f6-4316-a060-24fa1a0c071d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_df47edfe-806f-46fb-8af3-f03e0d657b6d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_df47edfe-806f-46fb-8af3-f03e0d657b6d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_1274a632-6e07-4da9-a0f6-de4b570ab45d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_1274a632-6e07-4da9-a0f6-de4b570ab45d" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_186222e0-ea22-4124-9d30-1a141612f697" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_186222e0-ea22-4124-9d30-1a141612f697" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_OperatingLeaseLiabilityOptionToExtendAmounts_8f47c1dd-5476-4630-91e3-f922e375922b" xlink:href="jkhy-20220630.xsd#jkhy_OperatingLeaseLiabilityOptionToExtendAmounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_jkhy_OperatingLeaseLiabilityOptionToExtendAmounts_8f47c1dd-5476-4630-91e3-f922e375922b" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_LesseeLeaseNotYetCommencedFutureMinimumPaymentsDue_f1fc2275-15a3-47ca-8169-909bb7857e17" xlink:href="jkhy-20220630.xsd#jkhy_LesseeLeaseNotYetCommencedFutureMinimumPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_jkhy_LesseeLeaseNotYetCommencedFutureMinimumPaymentsDue_f1fc2275-15a3-47ca-8169-909bb7857e17" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_b89c3dcb-c86e-49ab-8eb0-3497f58f8b07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1_b89c3dcb-c86e-49ab-8eb0-3497f58f8b07" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_df2310f8-4d44-4135-905f-61ee103296cb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_df2310f8-4d44-4135-905f-61ee103296cb" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_fdbfab33-7add-4d58-bfa2-7c18dc8d7659" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_fdbfab33-7add-4d58-bfa2-7c18dc8d7659" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_21ce508e-340f-4eda-b33d-28d8bb45754f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_21ce508e-340f-4eda-b33d-28d8bb45754f" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_480ee9cd-1f22-497f-989d-671e6e4b48d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_480ee9cd-1f22-497f-989d-671e6e4b48d8" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_9705c3a0-dbb4-4752-bbb3-7b0ad2ec81af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_9705c3a0-dbb4-4752-bbb3-7b0ad2ec81af" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_ed0cf181-6536-436f-939f-98ef4554b3a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_ed0cf181-6536-436f-939f-98ef4554b3a7" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_442abe1d-7752-4801-a063-250230be2990" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_c5a4ad7f-c20f-4815-9b13-1ed3fd3c4745" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_442abe1d-7752-4801-a063-250230be2990" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6d4125d9-7a62-4b53-a407-d8ee5530704e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_442abe1d-7752-4801-a063-250230be2990" xlink:to="loc_srt_RangeAxis_6d4125d9-7a62-4b53-a407-d8ee5530704e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6d4125d9-7a62-4b53-a407-d8ee5530704e_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6d4125d9-7a62-4b53-a407-d8ee5530704e" xlink:to="loc_srt_RangeMember_6d4125d9-7a62-4b53-a407-d8ee5530704e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_97b3c3a5-0f5a-4aa9-84a9-ba519011c41b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6d4125d9-7a62-4b53-a407-d8ee5530704e" xlink:to="loc_srt_RangeMember_97b3c3a5-0f5a-4aa9-84a9-ba519011c41b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_959ff175-2df7-4a27-8663-bb255c01802a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_97b3c3a5-0f5a-4aa9-84a9-ba519011c41b" xlink:to="loc_srt_MinimumMember_959ff175-2df7-4a27-8663-bb255c01802a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3f45b794-cad8-41d4-a041-cd2ac4ddffe6" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_97b3c3a5-0f5a-4aa9-84a9-ba519011c41b" xlink:to="loc_srt_MaximumMember_3f45b794-cad8-41d4-a041-cd2ac4ddffe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_ab24384f-db19-4d55-86f5-4b50e32d40b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_442abe1d-7752-4801-a063-250230be2990" xlink:to="loc_us-gaap_LeaseContractualTermAxis_ab24384f-db19-4d55-86f5-4b50e32d40b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_ab24384f-db19-4d55-86f5-4b50e32d40b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_ab24384f-db19-4d55-86f5-4b50e32d40b6" xlink:to="loc_us-gaap_LeaseContractualTermDomain_ab24384f-db19-4d55-86f5-4b50e32d40b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_f2230446-65bd-4805-9946-ac91cf2c55ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_ab24384f-db19-4d55-86f5-4b50e32d40b6" xlink:to="loc_us-gaap_LeaseContractualTermDomain_f2230446-65bd-4805-9946-ac91cf2c55ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CedarFallsIAMember_c5c5d650-8ab2-49a2-95fe-135b87b9c5d1" xlink:href="jkhy-20220630.xsd#jkhy_CedarFallsIAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_f2230446-65bd-4805-9946-ac91cf2c55ac" xlink:to="loc_jkhy_CedarFallsIAMember_c5c5d650-8ab2-49a2-95fe-135b87b9c5d1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/PropertyandEquipmentDetails" xlink:type="extended" id="i1055e052a7204b5d8dc5df294134fb1d_PropertyandEquipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Land_4d8d6d9d-6a9f-4e62-a55f-4b79f342fab6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Land"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_Land_4d8d6d9d-6a9f-4e62-a55f-4b79f342fab6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandImprovements_2de6424a-ac65-47e8-9d7b-e3f38fa9171c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LandImprovements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_LandImprovements_2de6424a-ac65-47e8-9d7b-e3f38fa9171c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_a113bc21-3855-454f-9528-405402df364a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingsAndImprovementsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_BuildingsAndImprovementsGross_a113bc21-3855-454f-9528-405402df364a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsGross_c501f41b-4681-4ba6-a5c4-6b029224cef0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseholdImprovementsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_LeaseholdImprovementsGross_c501f41b-4681-4ba6-a5c4-6b029224cef0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixturesAndEquipmentGross_4c373c0e-b3c0-40d6-b8c0-7878c7a28faf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FixturesAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_FixturesAndEquipmentGross_4c373c0e-b3c0-40d6-b8c0-7878c7a28faf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FlightEquipmentGross_8df61d05-ee66-41c7-9044-d5680410b25f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FlightEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_FlightEquipmentGross_8df61d05-ee66-41c7-9044-d5680410b25f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressGross_d79dbfc3-6260-4494-a516-efc21514c115" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConstructionInProgressGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_ConstructionInProgressGross_d79dbfc3-6260-4494-a516-efc21514c115" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_3b1f8545-1927-4f45-a11e-9f0062f35a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_3b1f8545-1927-4f45-a11e-9f0062f35a0e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_ea9aa8d5-f3aa-4e05-a90b-65bb2405a417" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_ea9aa8d5-f3aa-4e05-a90b-65bb2405a417" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_65f0a5a2-c42c-488c-b195-5f6fb5e7c6b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_65f0a5a2-c42c-488c-b195-5f6fb5e7c6b4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_48e4a0b8-90c2-4bb0-99cb-6adf82a3500f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_48e4a0b8-90c2-4bb0-99cb-6adf82a3500f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d17f7e27-7a87-4982-8f37-bf635673e45e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d17f7e27-7a87-4982-8f37-bf635673e45e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAssumed1_e87c780b-fd7c-4f98-8119-f305da6266d8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAssumed1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_LiabilitiesAssumed1_e87c780b-fd7c-4f98-8119-f305da6266d8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ChangesInPropertyAndEquipmentAcquiredThroughCapitalLeases_8ac695ec-7e34-4e9f-99cb-3f49678b9c8f" xlink:href="jkhy-20220630.xsd#jkhy_ChangesInPropertyAndEquipmentAcquiredThroughCapitalLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_jkhy_ChangesInPropertyAndEquipmentAcquiredThroughCapitalLeases_8ac695ec-7e34-4e9f-99cb-3f49678b9c8f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_9da251fa-1d71-43af-89b7-be75a860a108" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_9da251fa-1d71-43af-89b7-be75a860a108" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_7c5418fb-c292-4e05-ba44-a0c480e926c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_7c5418fb-c292-4e05-ba44-a0c480e926c7" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a3f45ae6-6ad0-46db-b724-05576420aec0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_03ec3187-d103-4bd8-8638-44cd6c733d92" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a3f45ae6-6ad0-46db-b724-05576420aec0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_53afbfa5-221e-494f-9de5-be3044ab27e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a3f45ae6-6ad0-46db-b724-05576420aec0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_53afbfa5-221e-494f-9de5-be3044ab27e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53afbfa5-221e-494f-9de5-be3044ab27e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_53afbfa5-221e-494f-9de5-be3044ab27e1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_53afbfa5-221e-494f-9de5-be3044ab27e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_53afbfa5-221e-494f-9de5-be3044ab27e1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandImprovementsMember_bbafbf03-4980-420f-a78c-a3bd3c0c6909" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LandImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:to="loc_us-gaap_LandImprovementsMember_bbafbf03-4980-420f-a78c-a3bd3c0c6909" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_fd5ccfe7-4adb-40ae-80e7-086c8afc0eb9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:to="loc_us-gaap_BuildingMember_fd5ccfe7-4adb-40ae-80e7-086c8afc0eb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_d0d452aa-840f-41ef-b413-7602546668da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_d0d452aa-840f-41ef-b413-7602546668da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_b26e91d3-ec44-44d2-8b47-247055fd5fb5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:to="loc_us-gaap_EquipmentMember_b26e91d3-ec44-44d2-8b47-247055fd5fb5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FlightEquipmentMember_3b8c0ebf-f4cb-4a93-98f0-0adceaa8e0f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FlightEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3894de19-b2d5-46d5-b3e2-3c5f652f0849" xlink:to="loc_us-gaap_FlightEquipmentMember_3b8c0ebf-f4cb-4a93-98f0-0adceaa8e0f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e57b6a09-ea2b-43e2-8676-fe6a0d6b2631" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_a3f45ae6-6ad0-46db-b724-05576420aec0" xlink:to="loc_srt_RangeAxis_e57b6a09-ea2b-43e2-8676-fe6a0d6b2631" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e57b6a09-ea2b-43e2-8676-fe6a0d6b2631_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e57b6a09-ea2b-43e2-8676-fe6a0d6b2631" xlink:to="loc_srt_RangeMember_e57b6a09-ea2b-43e2-8676-fe6a0d6b2631_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_dc3964f3-813e-4f91-8f85-d3ba97d7e9de" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e57b6a09-ea2b-43e2-8676-fe6a0d6b2631" xlink:to="loc_srt_RangeMember_dc3964f3-813e-4f91-8f85-d3ba97d7e9de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_60ecc24c-5986-414c-a230-c45e40c96914" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_dc3964f3-813e-4f91-8f85-d3ba97d7e9de" xlink:to="loc_srt_MinimumMember_60ecc24c-5986-414c-a230-c45e40c96914" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_06f315be-bc6b-4db0-a523-3232d0385021" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_dc3964f3-813e-4f91-8f85-d3ba97d7e9de" xlink:to="loc_srt_MaximumMember_06f315be-bc6b-4db0-a523-3232d0385021" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/OtherAssetsGoodwillDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#OtherAssetsGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/OtherAssetsGoodwillDetails" xlink:type="extended" id="i26eed27b4b4c4f7f91bc6058d1168113_OtherAssetsGoodwillDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_22d74e69-7fdf-44dc-a172-7ab6b5f43b3d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_edfa2779-e06d-4f90-9dd3-b1a5d87c83e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_22d74e69-7fdf-44dc-a172-7ab6b5f43b3d" xlink:to="loc_us-gaap_GoodwillRollForward_edfa2779-e06d-4f90-9dd3-b1a5d87c83e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_08e4fdfb-7d3b-49cd-9fd1-110038c1f6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_edfa2779-e06d-4f90-9dd3-b1a5d87c83e5" xlink:to="loc_us-gaap_Goodwill_08e4fdfb-7d3b-49cd-9fd1-110038c1f6b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_e99019f3-e345-44b3-b1f3-09680e9c05f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_edfa2779-e06d-4f90-9dd3-b1a5d87c83e5" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_e99019f3-e345-44b3-b1f3-09680e9c05f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillTransfers_cc262d92-a61b-4854-a58a-2c5e2725eae3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillTransfers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_edfa2779-e06d-4f90-9dd3-b1a5d87c83e5" xlink:to="loc_us-gaap_GoodwillTransfers_cc262d92-a61b-4854-a58a-2c5e2725eae3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_d544b106-efc8-4d09-92ef-add99265bbde" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_edfa2779-e06d-4f90-9dd3-b1a5d87c83e5" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_d544b106-efc8-4d09-92ef-add99265bbde" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_4f80786d-9121-4067-8b6a-444c979393c2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_e993eba4-5a72-47c1-a4a7-957abced3f3a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_22d74e69-7fdf-44dc-a172-7ab6b5f43b3d" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_e993eba4-5a72-47c1-a4a7-957abced3f3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionAxis_968194cd-470d-49e2-a6d5-cc09b6ba7189" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_e993eba4-5a72-47c1-a4a7-957abced3f3a" xlink:to="loc_us-gaap_AssetAcquisitionAxis_968194cd-470d-49e2-a6d5-cc09b6ba7189" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_968194cd-470d-49e2-a6d5-cc09b6ba7189_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetAcquisitionAxis_968194cd-470d-49e2-a6d5-cc09b6ba7189" xlink:to="loc_us-gaap_AssetAcquisitionDomain_968194cd-470d-49e2-a6d5-cc09b6ba7189_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_7f2c0d07-45b4-4a3a-9330-b62a02153881" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetAcquisitionAxis_968194cd-470d-49e2-a6d5-cc09b6ba7189" xlink:to="loc_us-gaap_AssetAcquisitionDomain_7f2c0d07-45b4-4a3a-9330-b62a02153881" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialAssetAcquisitionsMember_3bc8b75e-9e71-4d4a-94f5-24eab5452141" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SeriesOfIndividuallyImmaterialAssetAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_7f2c0d07-45b4-4a3a-9330-b62a02153881" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialAssetAcquisitionsMember_3bc8b75e-9e71-4d4a-94f5-24eab5452141" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_9af7d1b8-ad23-4104-9112-37f53bf6151e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_e993eba4-5a72-47c1-a4a7-957abced3f3a" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_9af7d1b8-ad23-4104-9112-37f53bf6151e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9af7d1b8-ad23-4104-9112-37f53bf6151e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9af7d1b8-ad23-4104-9112-37f53bf6151e" xlink:to="loc_us-gaap_SegmentDomain_9af7d1b8-ad23-4104-9112-37f53bf6151e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_44baf737-4ab6-405c-ad92-22aa827e1253" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9af7d1b8-ad23-4104-9112-37f53bf6151e" xlink:to="loc_us-gaap_SegmentDomain_44baf737-4ab6-405c-ad92-22aa827e1253" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CoreSegmentMember_f6b4d60c-b713-4299-983e-6dac8f5cb5ff" xlink:href="jkhy-20220630.xsd#jkhy_CoreSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_44baf737-4ab6-405c-ad92-22aa827e1253" xlink:to="loc_jkhy_CoreSegmentMember_f6b4d60c-b713-4299-983e-6dac8f5cb5ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PaymentsMember_3b410b0a-3dfa-4c88-b642-2a32a2996680" xlink:href="jkhy-20220630.xsd#jkhy_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_44baf737-4ab6-405c-ad92-22aa827e1253" xlink:to="loc_jkhy_PaymentsMember_3b410b0a-3dfa-4c88-b642-2a32a2996680" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ComplementaryMember_d20adfc6-9a62-4ab2-bb63-6746f9a5795a" xlink:href="jkhy-20220630.xsd#jkhy_ComplementaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_44baf737-4ab6-405c-ad92-22aa827e1253" xlink:to="loc_jkhy_ComplementaryMember_d20adfc6-9a62-4ab2-bb63-6746f9a5795a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/OtherAssetsOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#OtherAssetsOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/OtherAssetsOtherIntangibleAssetsDetails" xlink:type="extended" id="i147ae717df40445d96ab04459c4395a0_OtherAssetsOtherIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7ea7b512-0b25-49f4-9773-324936f2e56e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_7ea7b512-0b25-49f4-9773-324936f2e56e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a44d618a-7e18-4871-b5df-e58ace77e46c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_a44d618a-7e18-4871-b5df-e58ace77e46c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_38a3a788-8ccd-45f1-9933-0dac11ffc80d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_38a3a788-8ccd-45f1-9933-0dac11ffc80d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_dd196ab4-4a93-4872-9cee-55a2e561d113" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_dd196ab4-4a93-4872-9cee-55a2e561d113" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_2d877352-9c61-419d-b67b-3dc8f4034cea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_2d877352-9c61-419d-b67b-3dc8f4034cea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_f1a22d5b-95a2-4c6c-a8e0-25c54e76f628" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_AdjustmentForAmortization_f1a22d5b-95a2-4c6c-a8e0-25c54e76f628" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_0cd2f690-222f-4308-a85d-c929f58d6e63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_0cd2f690-222f-4308-a85d-c929f58d6e63" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_6d0ddc2c-1980-45d2-9332-4f1194c143a5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_c293b98b-ee84-440d-95d1-68c1273ceba9" xlink:to="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_6d0ddc2c-1980-45d2-9332-4f1194c143a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b94d620f-b11f-446d-8a39-ebd025fab8f2" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_6d0ddc2c-1980-45d2-9332-4f1194c143a5" xlink:to="loc_srt_RangeAxis_b94d620f-b11f-446d-8a39-ebd025fab8f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b94d620f-b11f-446d-8a39-ebd025fab8f2_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b94d620f-b11f-446d-8a39-ebd025fab8f2" xlink:to="loc_srt_RangeMember_b94d620f-b11f-446d-8a39-ebd025fab8f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7aa4f1cc-77ed-4cd0-8609-21394ea247d9" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b94d620f-b11f-446d-8a39-ebd025fab8f2" xlink:to="loc_srt_RangeMember_7aa4f1cc-77ed-4cd0-8609-21394ea247d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_54b0f26d-37b4-4f70-9ecf-91a2bb52c77b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7aa4f1cc-77ed-4cd0-8609-21394ea247d9" xlink:to="loc_srt_MinimumMember_54b0f26d-37b4-4f70-9ecf-91a2bb52c77b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6e768820-77a7-424d-92bd-1c75f078f29c" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7aa4f1cc-77ed-4cd0-8609-21394ea247d9" xlink:to="loc_srt_MaximumMember_6e768820-77a7-424d-92bd-1c75f078f29c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7bef098f-4313-4869-9ff9-d8bbd5227440" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable_6d0ddc2c-1980-45d2-9332-4f1194c143a5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7bef098f-4313-4869-9ff9-d8bbd5227440" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7bef098f-4313-4869-9ff9-d8bbd5227440_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7bef098f-4313-4869-9ff9-d8bbd5227440" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_7bef098f-4313-4869-9ff9-d8bbd5227440_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_7bef098f-4313-4869-9ff9-d8bbd5227440" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_c9a646df-dd51-4972-85c0-344452a6ac8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:to="loc_us-gaap_CustomerRelationshipsMember_c9a646df-dd51-4972-85c0-344452a6ac8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_6e0c8c2b-2f62-4155-a6ff-cd8f7e9ace2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_6e0c8c2b-2f62-4155-a6ff-cd8f7e9ace2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_e3e8526e-6257-443a-abce-f5e1459a072a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_e3e8526e-6257-443a-abce-f5e1459a072a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ComputerSoftwaretobeSoldLeasedorMarketedMember_044dbcc6-f9a6-48dd-8543-4fa95e1981c6" xlink:href="jkhy-20220630.xsd#jkhy_ComputerSoftwaretobeSoldLeasedorMarketedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:to="loc_jkhy_ComputerSoftwaretobeSoldLeasedorMarketedMember_044dbcc6-f9a6-48dd-8543-4fa95e1981c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_InternalUseComputerSoftwareMember_14bc34db-e65a-4934-a55e-cf26401e5e53" xlink:href="jkhy-20220630.xsd#jkhy_InternalUseComputerSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0b93065e-1ad5-48be-a1b0-bacd43f9d1fc" xlink:to="loc_jkhy_InternalUseComputerSoftwareMember_14bc34db-e65a-4934-a55e-cf26401e5e53" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/OtherAssetsFutureAmortizationExpenseDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#OtherAssetsFutureAmortizationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/OtherAssetsFutureAmortizationExpenseDetails" xlink:type="extended" id="i4213423b8e4741f699331d62e2e6c1c9_OtherAssetsFutureAmortizationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_211c6342-3f94-4dac-86e3-9245b99c13fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_211c6342-3f94-4dac-86e3-9245b99c13fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_b3c33f2e-fdfd-46f0-91ee-ba4bfbd61c24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_b3c33f2e-fdfd-46f0-91ee-ba4bfbd61c24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_20885245-fb13-40fe-8e77-85fcdda883db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_20885245-fb13-40fe-8e77-85fcdda883db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_b5a3ed85-eb58-4653-9860-8b5bb6cdc280" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_b5a3ed85-eb58-4653-9860-8b5bb6cdc280" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_a07edac1-884d-4cf7-89e6-9447c3310ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_a07edac1-884d-4cf7-89e6-9447c3310ec1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_98f6b4a2-988c-45cb-94d4-bdd7d9838647" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_d9f230c2-2389-4ebe-910f-4b06cb8a9210" xlink:to="loc_us-gaap_StatementTable_98f6b4a2-988c-45cb-94d4-bdd7d9838647" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_779d815d-d634-47b8-9260-a3d49743ea88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_98f6b4a2-988c-45cb-94d4-bdd7d9838647" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_779d815d-d634-47b8-9260-a3d49743ea88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_779d815d-d634-47b8-9260-a3d49743ea88_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_779d815d-d634-47b8-9260-a3d49743ea88" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_779d815d-d634-47b8-9260-a3d49743ea88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2de2aa1d-fd68-44eb-994f-56d39975ec30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_779d815d-d634-47b8-9260-a3d49743ea88" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2de2aa1d-fd68-44eb-994f-56d39975ec30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_4b2b3317-2aa9-4b1e-995b-0132353cc7f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2de2aa1d-fd68-44eb-994f-56d39975ec30" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_4b2b3317-2aa9-4b1e-995b-0132353cc7f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_1789af5a-8b3f-4a0a-ada9-97caebb21f24" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2de2aa1d-fd68-44eb-994f-56d39975ec30" xlink:to="loc_us-gaap_CustomerRelationshipsMember_1789af5a-8b3f-4a0a-ada9-97caebb21f24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_d3539d8f-e10d-48f2-a006-de216fde69b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2de2aa1d-fd68-44eb-994f-56d39975ec30" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_d3539d8f-e10d-48f2-a006-de216fde69b1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/DebtNarrativeDetails" xlink:type="extended" id="i6c9146bfb7884fac9c0fc2903de01e72_DebtNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_ba5df8a9-5aa7-4dbd-9d30-b6d249324b60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_NotesPayableCurrent_ba5df8a9-5aa7-4dbd-9d30-b6d249324b60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermNotesPayable_59c3ab58-ae6e-4bd2-88ed-113c54c7f29b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermNotesPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_LongTermNotesPayable_59c3ab58-ae6e-4bd2-88ed-113c54c7f29b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_b369bbd4-537b-477a-8ca4-b3169a4bd3dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_b369bbd4-537b-477a-8ca4-b3169a4bd3dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2814b9f6-7ace-4519-b454-e0612daa20a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_2814b9f6-7ace-4519-b454-e0612daa20a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1edc4917-2f61-4036-8a50-20f0fbfbc9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_1edc4917-2f61-4036-8a50-20f0fbfbc9e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_2c5cdda5-740e-437a-83a5-ed7d0832b3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_2c5cdda5-740e-437a-83a5-ed7d0832b3d1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_382c46b2-f540-4921-b2c7-40edec557e79" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_LongTermDebt_382c46b2-f540-4921-b2c7-40edec557e79" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9ea74fe1-71e5-40ea-aabd-f2c954ff870b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9ea74fe1-71e5-40ea-aabd-f2c954ff870b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_6fab681c-d419-49c5-b56b-d83d50a1e606" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_6fab681c-d419-49c5-b56b-d83d50a1e606" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaid_6b045508-38e1-47d0-aa35-edf08b610acc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_InterestPaid_6b045508-38e1-47d0-aa35-edf08b610acc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_9fd47671-aafa-40aa-be39-f6e816695e62" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_UnsecuredDebt_9fd47671-aafa-40aa-be39-f6e816695e62" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_237f7dac-a850-49e7-8b92-ef742fabbadf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_4ed245a7-f88f-4559-96b9-58c1fd87ba4f" xlink:to="loc_us-gaap_StatementTable_237f7dac-a850-49e7-8b92-ef742fabbadf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_af00fa1d-8330-4a97-9b34-ec1ea30e9795" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_237f7dac-a850-49e7-8b92-ef742fabbadf" xlink:to="loc_us-gaap_VariableRateAxis_af00fa1d-8330-4a97-9b34-ec1ea30e9795" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_af00fa1d-8330-4a97-9b34-ec1ea30e9795_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_af00fa1d-8330-4a97-9b34-ec1ea30e9795" xlink:to="loc_us-gaap_VariableRateDomain_af00fa1d-8330-4a97-9b34-ec1ea30e9795_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_d837d6f1-ead6-451d-8b67-5f87190644fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_af00fa1d-8330-4a97-9b34-ec1ea30e9795" xlink:to="loc_us-gaap_VariableRateDomain_d837d6f1-ead6-451d-8b67-5f87190644fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_9d5db3f7-56ac-414b-a6e0-91c8389d5038" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d837d6f1-ead6-451d-8b67-5f87190644fc" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_9d5db3f7-56ac-414b-a6e0-91c8389d5038" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_178236db-7945-404b-85d0-4d56c0f43811" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d837d6f1-ead6-451d-8b67-5f87190644fc" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_178236db-7945-404b-85d0-4d56c0f43811" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrimeRateMember_6ba3b698-3909-42cb-89c4-d53b15d9d71c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrimeRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_d837d6f1-ead6-451d-8b67-5f87190644fc" xlink:to="loc_us-gaap_PrimeRateMember_6ba3b698-3909-42cb-89c4-d53b15d9d71c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_0a467a8b-dad3-466d-a4a1-d6032fcf8406" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_237f7dac-a850-49e7-8b92-ef742fabbadf" xlink:to="loc_us-gaap_CreditFacilityAxis_0a467a8b-dad3-466d-a4a1-d6032fcf8406" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_0a467a8b-dad3-466d-a4a1-d6032fcf8406_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_0a467a8b-dad3-466d-a4a1-d6032fcf8406" xlink:to="loc_us-gaap_CreditFacilityDomain_0a467a8b-dad3-466d-a4a1-d6032fcf8406_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bcba9bac-dcc3-4005-98be-b568c70c97dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_0a467a8b-dad3-466d-a4a1-d6032fcf8406" xlink:to="loc_us-gaap_CreditFacilityDomain_bcba9bac-dcc3-4005-98be-b568c70c97dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_8e0aaeb5-2bf0-420b-b926-271301ba2a84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bcba9bac-dcc3-4005-98be-b568c70c97dd" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_8e0aaeb5-2bf0-420b-b926-271301ba2a84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_40c16bf4-9ae2-4a4b-ac35-482606ea87ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_237f7dac-a850-49e7-8b92-ef742fabbadf" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_40c16bf4-9ae2-4a4b-ac35-482606ea87ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_40c16bf4-9ae2-4a4b-ac35-482606ea87ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_40c16bf4-9ae2-4a4b-ac35-482606ea87ee" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_40c16bf4-9ae2-4a4b-ac35-482606ea87ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_c61bbb59-1056-4e07-bf0a-f2cfa7c2d8f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_40c16bf4-9ae2-4a4b-ac35-482606ea87ee" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_c61bbb59-1056-4e07-bf0a-f2cfa7c2d8f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_dd901d43-4bd1-42c4-8529-317c6b18d1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_c61bbb59-1056-4e07-bf0a-f2cfa7c2d8f4" xlink:to="loc_us-gaap_LineOfCreditMember_dd901d43-4bd1-42c4-8529-317c6b18d1e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_8e90e3d4-0083-4f91-87e1-9977a99d63e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_237f7dac-a850-49e7-8b92-ef742fabbadf" xlink:to="loc_us-gaap_DebtInstrumentAxis_8e90e3d4-0083-4f91-87e1-9977a99d63e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_8e90e3d4-0083-4f91-87e1-9977a99d63e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_8e90e3d4-0083-4f91-87e1-9977a99d63e7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_8e90e3d4-0083-4f91-87e1-9977a99d63e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ed5cae3f-24cb-4212-933a-0163edcdea83" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_8e90e3d4-0083-4f91-87e1-9977a99d63e7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ed5cae3f-24cb-4212-933a-0163edcdea83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_fdf79fc2-cc7c-44e0-88a4-2c803b845b27" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_ed5cae3f-24cb-4212-933a-0163edcdea83" xlink:to="loc_us-gaap_UnsecuredDebtMember_fdf79fc2-cc7c-44e0-88a4-2c803b845b27" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="i141babc5fff144cb8ae0a5e5e3136d17_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_20a2afeb-e4a3-4571-a94c-0625aef90512" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_20a2afeb-e4a3-4571-a94c-0625aef90512" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_9a07d869-1a60-4abd-833d-b65b111d39e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_OperatingLossCarryforwards_9a07d869-1a60-4abd-833d-b65b111d39e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_b261f644-6814-4fac-9124-b3a4a938390f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_b261f644-6814-4fac-9124-b3a4a938390f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_25982d0b-a1be-446c-a26c-8a704c82a9f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_25982d0b-a1be-446c-a26c-8a704c82a9f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaid_6038a106-9617-477b-9eda-c5de8297611a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_IncomeTaxesPaid_6038a106-9617-477b-9eda-c5de8297611a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_2ee93f75-a2e3-4634-be0e-864ee02db027" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_2ee93f75-a2e3-4634-be0e-864ee02db027" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_faf8808b-af57-4f41-853f-522c27931524" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_faf8808b-af57-4f41-853f-522c27931524" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_34d80d7d-30ed-4fe7-957a-e9e5dcd95d92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_34d80d7d-30ed-4fe7-957a-e9e5dcd95d92" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_92a39780-b68a-4be6-9248-0ce00b17d463" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_92a39780-b68a-4be6-9248-0ce00b17d463" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_7a518f89-d21f-4c2f-95c2-91dd02521c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_7a518f89-d21f-4c2f-95c2-91dd02521c7e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_adadb7a6-6ca5-463e-82f5-b46e78c4a4e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1217f435-c208-42e9-926f-827da5964ec2" xlink:to="loc_us-gaap_StatementTable_adadb7a6-6ca5-463e-82f5-b46e78c4a4e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_703fd8d4-f71d-4b6e-80e2-b30f7432aa61" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_adadb7a6-6ca5-463e-82f5-b46e78c4a4e4" xlink:to="loc_srt_RangeAxis_703fd8d4-f71d-4b6e-80e2-b30f7432aa61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_703fd8d4-f71d-4b6e-80e2-b30f7432aa61_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_703fd8d4-f71d-4b6e-80e2-b30f7432aa61" xlink:to="loc_srt_RangeMember_703fd8d4-f71d-4b6e-80e2-b30f7432aa61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_493db39d-3243-46a9-b272-d874dcec9a57" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_703fd8d4-f71d-4b6e-80e2-b30f7432aa61" xlink:to="loc_srt_RangeMember_493db39d-3243-46a9-b272-d874dcec9a57" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_603979b4-0256-4085-913f-974c38a1e8ee" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_493db39d-3243-46a9-b272-d874dcec9a57" xlink:to="loc_srt_MinimumMember_603979b4-0256-4085-913f-974c38a1e8ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_851d3cab-a7df-477d-acba-58f3fabc7a0e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_493db39d-3243-46a9-b272-d874dcec9a57" xlink:to="loc_srt_MaximumMember_851d3cab-a7df-477d-acba-58f3fabc7a0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_100a3120-9b02-462b-868d-63bb220e1d8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_adadb7a6-6ca5-463e-82f5-b46e78c4a4e4" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_100a3120-9b02-462b-868d-63bb220e1d8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_100a3120-9b02-462b-868d-63bb220e1d8c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_100a3120-9b02-462b-868d-63bb220e1d8c" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_100a3120-9b02-462b-868d-63bb220e1d8c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_e218d185-daa5-40f4-af94-654317b3194c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_100a3120-9b02-462b-868d-63bb220e1d8c" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_e218d185-daa5-40f4-af94-654317b3194c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalRevenueServiceIRSMember_fc7b4cd6-8729-44f8-8cad-e402a3245b12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InternalRevenueServiceIRSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_e218d185-daa5-40f4-af94-654317b3194c" xlink:to="loc_us-gaap_InternalRevenueServiceIRSMember_fc7b4cd6-8729-44f8-8cad-e402a3245b12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_f75115c3-cd43-4582-94df-ffd078a504d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_e218d185-daa5-40f4-af94-654317b3194c" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_f75115c3-cd43-4582-94df-ffd078a504d4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended" id="ie6e3d5d1e0f64f408362885bff03f291_StockBasedCompensationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_b2e29634-d2bf-4341-99b7-e9ad450f61df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ShareBasedCompensation_b2e29634-d2bf-4341-99b7-e9ad450f61df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockExpense_39ace5c4-c801-4b47-b1fe-dd28eb7b4ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_RestrictedStockExpense_39ace5c4-c801-4b47-b1fe-dd28eb7b4ad0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_12cfdcb3-3f93-431f-a77f-c5d034a3e21d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_12cfdcb3-3f93-431f-a77f-c5d034a3e21d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_df986de9-09ff-43f4-a286-b36b019022d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_df986de9-09ff-43f4-a286-b36b019022d4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_b7500608-45b2-4518-a984-a918b5353d78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_b7500608-45b2-4518-a984-a918b5353d78" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1_bb5f2553-7f23-4c45-ba33-4cd206171924" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1_bb5f2553-7f23-4c45-ba33-4cd206171924" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterTerminationOfEmployment_f0c08969-f27a-4c85-ad80-e865663ecb4f" xlink:href="jkhy-20220630.xsd#jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterTerminationOfEmployment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterTerminationOfEmployment_f0c08969-f27a-4c85-ad80-e865663ecb4f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterDeath_e267bff1-0060-4313-8269-684493165379" xlink:href="jkhy-20220630.xsd#jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterDeath"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterDeath_e267bff1-0060-4313-8269-684493165379" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationAfterGrantDate_5cab90a8-2bd8-44d9-8d85-1d5f00f6284f" xlink:href="jkhy-20220630.xsd#jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationAfterGrantDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationAfterGrantDate_5cab90a8-2bd8-44d9-8d85-1d5f00f6284f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_812ec503-2fae-4970-ba47-32be821142f6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_812ec503-2fae-4970-ba47-32be821142f6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_037b5a0f-2201-4f12-aa48-19a52119dc0c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_037b5a0f-2201-4f12-aa48-19a52119dc0c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_bb34ee9d-877f-465e-9d35-8e5d67c61e22" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_bb34ee9d-877f-465e-9d35-8e5d67c61e22" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_25fdeef9-e64e-4629-b857-6cccdf2f86a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_25fdeef9-e64e-4629-b857-6cccdf2f86a0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1f8f1868-1392-408f-932e-dfc21dfa04b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_1f8f1868-1392-408f-932e-dfc21dfa04b6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_10c12381-0ff8-40a9-8037-a0235c1483b6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_10c12381-0ff8-40a9-8037-a0235c1483b6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_ac024d21-e447-4636-b3ae-dfdfa3f34e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_ac024d21-e447-4636-b3ae-dfdfa3f34e0d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_09d6d727-6a79-4a7b-96be-837555f58a81" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e4367c24-0031-4e18-bbc3-9f15bc3b9c3c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_09d6d727-6a79-4a7b-96be-837555f58a81" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_a3132a4b-dffb-49b7-9cb2-30f93215c29e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_09d6d727-6a79-4a7b-96be-837555f58a81" xlink:to="loc_us-gaap_ValuationTechniqueAxis_a3132a4b-dffb-49b7-9cb2-30f93215c29e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_a3132a4b-dffb-49b7-9cb2-30f93215c29e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_a3132a4b-dffb-49b7-9cb2-30f93215c29e" xlink:to="loc_us-gaap_ValuationTechniqueDomain_a3132a4b-dffb-49b7-9cb2-30f93215c29e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_dddd41d3-e203-44f7-80f6-a90301d85a18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_a3132a4b-dffb-49b7-9cb2-30f93215c29e" xlink:to="loc_us-gaap_ValuationTechniqueDomain_dddd41d3-e203-44f7-80f6-a90301d85a18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueongrantdatelessPVofdividendsMember_3ed7d024-ebf3-4836-9c29-1329e8233cbf" xlink:href="jkhy-20220630.xsd#jkhy_FairvalueongrantdatelessPVofdividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_dddd41d3-e203-44f7-80f6-a90301d85a18" xlink:to="loc_jkhy_FairvalueongrantdatelessPVofdividendsMember_3ed7d024-ebf3-4836-9c29-1329e8233cbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueunderMonteCarloMember_ab900bb9-3b26-44f5-8693-4e1ccca5d4cf" xlink:href="jkhy-20220630.xsd#jkhy_FairvalueunderMonteCarloMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_dddd41d3-e203-44f7-80f6-a90301d85a18" xlink:to="loc_jkhy_FairvalueunderMonteCarloMember_ab900bb9-3b26-44f5-8693-4e1ccca5d4cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_16428d4d-f3fc-4e13-96dd-ee7be4dbca89" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_09d6d727-6a79-4a7b-96be-837555f58a81" xlink:to="loc_srt_RangeAxis_16428d4d-f3fc-4e13-96dd-ee7be4dbca89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_16428d4d-f3fc-4e13-96dd-ee7be4dbca89_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_16428d4d-f3fc-4e13-96dd-ee7be4dbca89" xlink:to="loc_srt_RangeMember_16428d4d-f3fc-4e13-96dd-ee7be4dbca89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5de70476-62da-400b-a993-4f32e405f139" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_16428d4d-f3fc-4e13-96dd-ee7be4dbca89" xlink:to="loc_srt_RangeMember_5de70476-62da-400b-a993-4f32e405f139" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_60194c37-0387-4fbe-b4cb-6391b64d4abb" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_5de70476-62da-400b-a993-4f32e405f139" xlink:to="loc_srt_MinimumMember_60194c37-0387-4fbe-b4cb-6391b64d4abb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2e93383b-1cba-4f15-8d70-16b07cfccec0" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_5de70476-62da-400b-a993-4f32e405f139" xlink:to="loc_srt_MaximumMember_2e93383b-1cba-4f15-8d70-16b07cfccec0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_9ea00707-22bb-49f0-b4f1-80933420e642" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_09d6d727-6a79-4a7b-96be-837555f58a81" xlink:to="loc_us-gaap_PlanNameAxis_9ea00707-22bb-49f0-b4f1-80933420e642" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_9ea00707-22bb-49f0-b4f1-80933420e642_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_9ea00707-22bb-49f0-b4f1-80933420e642" xlink:to="loc_us-gaap_PlanNameDomain_9ea00707-22bb-49f0-b4f1-80933420e642_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_45d14941-6158-4dab-8e5b-e409c05d2563" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_9ea00707-22bb-49f0-b4f1-80933420e642" xlink:to="loc_us-gaap_PlanNameDomain_45d14941-6158-4dab-8e5b-e409c05d2563" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_A2015EIPMember_0cec6f4a-c839-42aa-b12d-52eea102d252" xlink:href="jkhy-20220630.xsd#jkhy_A2015EIPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_45d14941-6158-4dab-8e5b-e409c05d2563" xlink:to="loc_jkhy_A2015EIPMember_0cec6f4a-c839-42aa-b12d-52eea102d252" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_5489f615-bc5c-4d97-9786-7efd54db1216" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_09d6d727-6a79-4a7b-96be-837555f58a81" xlink:to="loc_us-gaap_AwardTypeAxis_5489f615-bc5c-4d97-9786-7efd54db1216" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5489f615-bc5c-4d97-9786-7efd54db1216_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_5489f615-bc5c-4d97-9786-7efd54db1216" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5489f615-bc5c-4d97-9786-7efd54db1216_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ed4d8a13-ca84-4bc7-9e77-4f2f31cdf733" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_5489f615-bc5c-4d97-9786-7efd54db1216" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ed4d8a13-ca84-4bc7-9e77-4f2f31cdf733" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_9569e340-79a7-455d-8476-345f6b04dbd5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ed4d8a13-ca84-4bc7-9e77-4f2f31cdf733" xlink:to="loc_us-gaap_EmployeeStockOptionMember_9569e340-79a7-455d-8476-345f6b04dbd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_6099349b-06b8-4eb6-aa8e-c9e49b09d089" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ed4d8a13-ca84-4bc7-9e77-4f2f31cdf733" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6099349b-06b8-4eb6-aa8e-c9e49b09d089" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_e3561879-fb66-40ba-8367-82a4bca29d83" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ed4d8a13-ca84-4bc7-9e77-4f2f31cdf733" xlink:to="loc_us-gaap_RestrictedStockMember_e3561879-fb66-40ba-8367-82a4bca29d83" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/StockOptionsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#StockOptionsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/StockOptionsDetails" xlink:type="extended" id="i30527ffaf70d43c9849f7180d0d957a2_StockOptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3e815b88-965a-4048-a7ea-574e31916f34" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3e815b88-965a-4048-a7ea-574e31916f34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_88ff0401-106d-48e0-aa96-3cca6c22db07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_88ff0401-106d-48e0-aa96-3cca6c22db07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_3e9e52cc-8329-473a-862c-72b2808f0b1c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_3e9e52cc-8329-473a-862c-72b2808f0b1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_71a16915-8e6b-4462-8e21-d8e13bf216e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_71a16915-8e6b-4462-8e21-d8e13bf216e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_b31df85f-a874-4ef0-92f0-572daefb5945" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_b31df85f-a874-4ef0-92f0-572daefb5945" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_4a046777-6c68-4b3f-a59f-e4e682143f91" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_634224c1-49a0-49d1-9734-4c8f438f5f51" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_634224c1-49a0-49d1-9734-4c8f438f5f51" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_515b07ee-2561-4ecb-8b27-26adcc29d54a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_515b07ee-2561-4ecb-8b27-26adcc29d54a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_cc289837-b6f3-485b-88c6-e45f13743107" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_cc289837-b6f3-485b-88c6-e45f13743107" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_cb502acb-e294-45e4-8f28-22e7044396dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_cb502acb-e294-45e4-8f28-22e7044396dc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_e5d81db3-ef43-4e4e-9ef4-19c38b2c1f43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_96cb474a-d7c3-4907-a359-126cafe233d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_96cb474a-d7c3-4907-a359-126cafe233d4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_38217f9f-4fb4-43d2-9aaf-71f0698a8f12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_38217f9f-4fb4-43d2-9aaf-71f0698a8f12" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_6140e1d1-79cf-41df-a6b0-7f163c49d338" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_6140e1d1-79cf-41df-a6b0-7f163c49d338" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_f3403d0f-66e3-43d6-82ea-f9903fecbd2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_f3403d0f-66e3-43d6-82ea-f9903fecbd2c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5c17bcd4-a252-477b-93fe-05c5585a6fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_5c17bcd4-a252-477b-93fe-05c5585a6fe2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_d7b35e63-ee13-4ed1-ba15-f1af7e098b45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_d7b35e63-ee13-4ed1-ba15-f1af7e098b45" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_7897314c-88c2-4ac7-bae2-33429af196fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_e09baac2-50d9-42ae-9fba-97be65eb2439" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_7897314c-88c2-4ac7-bae2-33429af196fa" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ad60f955-1bbc-466b-ba8c-599192b04782" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3e815b88-965a-4048-a7ea-574e31916f34" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ad60f955-1bbc-466b-ba8c-599192b04782" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fcf6fb33-08c9-4f04-ac6c-4cf5c5130471" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_ad60f955-1bbc-466b-ba8c-599192b04782" xlink:to="loc_us-gaap_AwardTypeAxis_fcf6fb33-08c9-4f04-ac6c-4cf5c5130471" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fcf6fb33-08c9-4f04-ac6c-4cf5c5130471_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fcf6fb33-08c9-4f04-ac6c-4cf5c5130471" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fcf6fb33-08c9-4f04-ac6c-4cf5c5130471_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_287353e3-7744-4d4b-8768-cae11342021c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fcf6fb33-08c9-4f04-ac6c-4cf5c5130471" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_287353e3-7744-4d4b-8768-cae11342021c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_8148b0ab-11fb-4e5e-91b2-6c0375624d31" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_287353e3-7744-4d4b-8768-cae11342021c" xlink:to="loc_us-gaap_EmployeeStockOptionMember_8148b0ab-11fb-4e5e-91b2-6c0375624d31" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RestrictedStockShareAwardsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#RestrictedStockShareAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RestrictedStockShareAwardsDetails" xlink:type="extended" id="i0000da97e1e34a41bb2a51a3ac88225d_RestrictedStockShareAwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f2d7bb5a-f808-4b9d-a3f1-ba27fe43d546" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f2d7bb5a-f808-4b9d-a3f1-ba27fe43d546" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_97fcf6d9-2e51-4a6d-9403-c99ac2edfbf1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_97fcf6d9-2e51-4a6d-9403-c99ac2edfbf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_013535db-4c6e-46f2-9fa4-2292a734b15a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_013535db-4c6e-46f2-9fa4-2292a734b15a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_e6bc5b1c-1236-43ba-915f-20c744cbf26d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_e6bc5b1c-1236-43ba-915f-20c744cbf26d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_47d690a7-84f5-4776-b317-290629c892b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_47d690a7-84f5-4776-b317-290629c892b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_15dab100-d8a4-480d-973c-31f111a90db2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_059f3151-92de-4631-9793-f4ae07e0d94b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_059f3151-92de-4631-9793-f4ae07e0d94b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_afa1f069-b4a7-4ed0-98c3-f6bfd5f1b376" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_afa1f069-b4a7-4ed0-98c3-f6bfd5f1b376" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_46373e88-ce86-4dab-a45d-3b43c958a89a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_46373e88-ce86-4dab-a45d-3b43c958a89a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f0cf2a52-62ad-4a9d-a924-dd285cccc670" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_fb49fd99-4cd9-493c-b72f-04978b191af2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_f0cf2a52-62ad-4a9d-a924-dd285cccc670" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c9474108-64b0-4d1e-8d01-097952e0e5e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_814ec114-136c-4cea-9645-d7becffeccc8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_f2d7bb5a-f808-4b9d-a3f1-ba27fe43d546" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_814ec114-136c-4cea-9645-d7becffeccc8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_da7d05c4-8f91-4d42-9a54-1d9b198a2edc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_814ec114-136c-4cea-9645-d7becffeccc8" xlink:to="loc_us-gaap_AwardTypeAxis_da7d05c4-8f91-4d42-9a54-1d9b198a2edc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_da7d05c4-8f91-4d42-9a54-1d9b198a2edc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_da7d05c4-8f91-4d42-9a54-1d9b198a2edc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_da7d05c4-8f91-4d42-9a54-1d9b198a2edc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f69e59b8-733d-4700-b8f9-7a70979c2130" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_da7d05c4-8f91-4d42-9a54-1d9b198a2edc" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f69e59b8-733d-4700-b8f9-7a70979c2130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_5fda027b-be03-43e9-9aad-5564a6db4215" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f69e59b8-733d-4700-b8f9-7a70979c2130" xlink:to="loc_us-gaap_RestrictedStockMember_5fda027b-be03-43e9-9aad-5564a6db4215" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RestrictedStockUnitAwardsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#RestrictedStockUnitAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RestrictedStockUnitAwardsDetails" xlink:type="extended" id="i3a23815e408442abb3068af0ea61f963_RestrictedStockUnitAwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e03f1b90-d543-4b8c-b8ca-43d7523d86fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e03f1b90-d543-4b8c-b8ca-43d7523d86fd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_cd9f26b1-885f-44a3-a6fc-e3ec69b937aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_cd9f26b1-885f-44a3-a6fc-e3ec69b937aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c261bb3b-b7e8-4435-a65b-9c2eec8233a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_c261bb3b-b7e8-4435-a65b-9c2eec8233a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_e2062b8a-d9f1-42c9-9037-5c52e44b4581" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_e2062b8a-d9f1-42c9-9037-5c52e44b4581" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_d656f0be-328b-417d-8b1e-4c502235cd9f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_d656f0be-328b-417d-8b1e-4c502235cd9f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_15e41b31-3c23-4d5b-bdf3-ea390d5e5f12" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6839dbd2-f494-4010-8d7f-744a7320d63d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6839dbd2-f494-4010-8d7f-744a7320d63d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6c8cb39d-d7f5-4427-a91f-44824a6acb0a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6c8cb39d-d7f5-4427-a91f-44824a6acb0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d21eeed0-ddb3-4e17-97ff-d3cb25e15efe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d21eeed0-ddb3-4e17-97ff-d3cb25e15efe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_3242c1e2-1ae1-456f-bbd9-d17fa1a36240" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_3242c1e2-1ae1-456f-bbd9-d17fa1a36240" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_2f2e4bc2-614b-4bec-b794-27954e8b1468" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_ffbfacde-2ef4-4d6f-b814-fb311ce502d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_80c8459a-4664-4843-a069-bd2603c84f7d" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_ffbfacde-2ef4-4d6f-b814-fb311ce502d0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34220bf1-b248-4dd3-8095-39b5c8bd6710" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_e03f1b90-d543-4b8c-b8ca-43d7523d86fd" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34220bf1-b248-4dd3-8095-39b5c8bd6710" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_403b67de-4c4c-4fa4-a01e-62727f04d057" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34220bf1-b248-4dd3-8095-39b5c8bd6710" xlink:to="loc_us-gaap_AwardTypeAxis_403b67de-4c4c-4fa4-a01e-62727f04d057" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_403b67de-4c4c-4fa4-a01e-62727f04d057_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_403b67de-4c4c-4fa4-a01e-62727f04d057" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_403b67de-4c4c-4fa4-a01e-62727f04d057_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cae4d9e7-855b-4d67-ac56-c977a74ad098" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_403b67de-4c4c-4fa4-a01e-62727f04d057" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cae4d9e7-855b-4d67-ac56-c977a74ad098" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_9ddd8526-89da-4d16-956a-f13827d3edbe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cae4d9e7-855b-4d67-ac56-c977a74ad098" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_9ddd8526-89da-4d16-956a-f13827d3edbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_7dbafb42-c0d6-4593-bfd4-464bb01d30ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cae4d9e7-855b-4d67-ac56-c977a74ad098" xlink:to="loc_us-gaap_PerformanceSharesMember_7dbafb42-c0d6-4593-bfd4-464bb01d30ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_e1551dd5-5af6-4e5c-b573-1900b98066c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_34220bf1-b248-4dd3-8095-39b5c8bd6710" xlink:to="loc_us-gaap_ValuationTechniqueAxis_e1551dd5-5af6-4e5c-b573-1900b98066c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_e1551dd5-5af6-4e5c-b573-1900b98066c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_e1551dd5-5af6-4e5c-b573-1900b98066c3" xlink:to="loc_us-gaap_ValuationTechniqueDomain_e1551dd5-5af6-4e5c-b573-1900b98066c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_96227cd0-fa7b-4391-b19f-782b80905e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_e1551dd5-5af6-4e5c-b573-1900b98066c3" xlink:to="loc_us-gaap_ValuationTechniqueDomain_96227cd0-fa7b-4391-b19f-782b80905e3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueongrantdatelessPVofdividendsMember_31539d70-10f1-4295-a4ff-10610690bcf3" xlink:href="jkhy-20220630.xsd#jkhy_FairvalueongrantdatelessPVofdividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_96227cd0-fa7b-4391-b19f-782b80905e3d" xlink:to="loc_jkhy_FairvalueongrantdatelessPVofdividendsMember_31539d70-10f1-4295-a4ff-10610690bcf3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueunderMonteCarloMember_842d484c-7d7c-4336-9bcb-c226bc48c7d3" xlink:href="jkhy-20220630.xsd#jkhy_FairvalueunderMonteCarloMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_96227cd0-fa7b-4391-b19f-782b80905e3d" xlink:to="loc_jkhy_FairvalueunderMonteCarloMember_842d484c-7d7c-4336-9bcb-c226bc48c7d3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RSUMeasurementDateAssumptionsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#RSUMeasurementDateAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RSUMeasurementDateAssumptionsDetails" xlink:type="extended" id="i44809c1a3a8f43c280e15fe3eb75e19f_RSUMeasurementDateAssumptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_247464e4-d6d7-4e95-b9ca-459f184a6cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_247464e4-d6d7-4e95-b9ca-459f184a6cb2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_eb2e4246-8e81-477a-8ce3-03631d35692e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_eb2e4246-8e81-477a-8ce3-03631d35692e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_38079440-7452-4beb-a9ad-888ca94269d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_38079440-7452-4beb-a9ad-888ca94269d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_1faef391-258a-48fb-9265-0d18cde7986e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_1faef391-258a-48fb-9265-0d18cde7986e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_ca597e27-2bce-43c6-9452-e71c11082192" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_ca597e27-2bce-43c6-9452-e71c11082192" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_BeginningPercentileRankForTotalShareReturnTSR_a5db7c2e-ffe7-4b1c-876f-654ea088f0cc" xlink:href="jkhy-20220630.xsd#jkhy_BeginningPercentileRankForTotalShareReturnTSR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_f7f381ac-f080-4d58-b41b-c1df64a501e3" xlink:to="loc_jkhy_BeginningPercentileRankForTotalShareReturnTSR_a5db7c2e-ffe7-4b1c-876f-654ea088f0cc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b292d22b-987c-4b69-b05f-f649d973abbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_247464e4-d6d7-4e95-b9ca-459f184a6cb2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b292d22b-987c-4b69-b05f-f649d973abbb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_720018d4-3922-4bf7-8355-b32bcd731f6d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b292d22b-987c-4b69-b05f-f649d973abbb" xlink:to="loc_us-gaap_AwardTypeAxis_720018d4-3922-4bf7-8355-b32bcd731f6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_720018d4-3922-4bf7-8355-b32bcd731f6d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_720018d4-3922-4bf7-8355-b32bcd731f6d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_720018d4-3922-4bf7-8355-b32bcd731f6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a0820b2-4a24-42d7-a59c-062603660f43" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_720018d4-3922-4bf7-8355-b32bcd731f6d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a0820b2-4a24-42d7-a59c-062603660f43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_08ec8b87-7ec0-4d91-9b08-d6e0b63617a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3a0820b2-4a24-42d7-a59c-062603660f43" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_08ec8b87-7ec0-4d91-9b08-d6e0b63617a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_3c0651c7-7948-459c-a8f3-c4c0ea59f23a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b292d22b-987c-4b69-b05f-f649d973abbb" xlink:to="loc_us-gaap_ValuationTechniqueAxis_3c0651c7-7948-459c-a8f3-c4c0ea59f23a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_3c0651c7-7948-459c-a8f3-c4c0ea59f23a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_3c0651c7-7948-459c-a8f3-c4c0ea59f23a" xlink:to="loc_us-gaap_ValuationTechniqueDomain_3c0651c7-7948-459c-a8f3-c4c0ea59f23a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_57e18ad9-0681-404e-9dcb-df87146bd248" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_3c0651c7-7948-459c-a8f3-c4c0ea59f23a" xlink:to="loc_us-gaap_ValuationTechniqueDomain_57e18ad9-0681-404e-9dcb-df87146bd248" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CompensationPeerGroupMember_8ccc2fc9-ec27-4691-838e-c5ffc46a9d16" xlink:href="jkhy-20220630.xsd#jkhy_CompensationPeerGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_57e18ad9-0681-404e-9dcb-df87146bd248" xlink:to="loc_jkhy_CompensationPeerGroupMember_8ccc2fc9-ec27-4691-838e-c5ffc46a9d16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_SP500ITIndexMember_e71da741-a038-4cc1-aa49-199c397c1e15" xlink:href="jkhy-20220630.xsd#jkhy_SP500ITIndexMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_57e18ad9-0681-404e-9dcb-df87146bd248" xlink:to="loc_jkhy_SP500ITIndexMember_e71da741-a038-4cc1-aa49-199c397c1e15" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/EmployeeBenefitsPlansEmployeeStockPurchasePlanDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#EmployeeBenefitsPlansEmployeeStockPurchasePlanDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/EmployeeBenefitsPlansEmployeeStockPurchasePlanDetails" xlink:type="extended" id="i8db10d3036ac4180b0642862bb5516f0_EmployeeBenefitsPlansEmployeeStockPurchasePlanDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_3bb14f80-04ff-48c0-8555-67b3229e1d40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_e161c52e-7ef1-4e81-ae0a-5eb1dc0b8d0f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3bb14f80-04ff-48c0-8555-67b3229e1d40" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_e161c52e-7ef1-4e81-ae0a-5eb1dc0b8d0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_8ec077a1-9aac-4720-91f0-7351b151f5d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3bb14f80-04ff-48c0-8555-67b3229e1d40" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_8ec077a1-9aac-4720-91f0-7351b151f5d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_Employeestockpurchaseplanaveragepricepershare_dc638108-1f85-43a2-ac9b-45d14219a10e" xlink:href="jkhy-20220630.xsd#jkhy_Employeestockpurchaseplanaveragepricepershare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3bb14f80-04ff-48c0-8555-67b3229e1d40" xlink:to="loc_jkhy_Employeestockpurchaseplanaveragepricepershare_dc638108-1f85-43a2-ac9b-45d14219a10e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_f1cbd4b1-22e2-47bd-b741-4e4b5d830691" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3bb14f80-04ff-48c0-8555-67b3229e1d40" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_f1cbd4b1-22e2-47bd-b741-4e4b5d830691" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_58db86c1-9804-4f70-97cd-2d0d0cd753a5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3bb14f80-04ff-48c0-8555-67b3229e1d40" xlink:to="loc_us-gaap_StatementTable_58db86c1-9804-4f70-97cd-2d0d0cd753a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_d11bb6eb-80f0-4914-ad31-f18b7a41e7da" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_58db86c1-9804-4f70-97cd-2d0d0cd753a5" xlink:to="loc_us-gaap_PlanNameAxis_d11bb6eb-80f0-4914-ad31-f18b7a41e7da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_d11bb6eb-80f0-4914-ad31-f18b7a41e7da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_d11bb6eb-80f0-4914-ad31-f18b7a41e7da" xlink:to="loc_us-gaap_PlanNameDomain_d11bb6eb-80f0-4914-ad31-f18b7a41e7da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_48fbd00a-3f58-4a93-8451-227cf981e638" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_d11bb6eb-80f0-4914-ad31-f18b7a41e7da" xlink:to="loc_us-gaap_PlanNameDomain_48fbd00a-3f58-4a93-8451-227cf981e638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_EmployeeStockPurchasePlanMember_0b60798c-1558-454e-b859-575c6485571e" xlink:href="jkhy-20220630.xsd#jkhy_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_48fbd00a-3f58-4a93-8451-227cf981e638" xlink:to="loc_jkhy_EmployeeStockPurchasePlanMember_0b60798c-1558-454e-b859-575c6485571e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/BusinessAcquisitionsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#BusinessAcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/BusinessAcquisitionsDetails" xlink:type="extended" id="i86ecfc0eb29e492aae186ea6236ed2c8_BusinessAcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_88021364-deab-4e95-bec9-3641b82d884c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:to="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_88021364-deab-4e95-bec9-3641b82d884c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_55199e11-083d-4c40-8f5c-ea6a3635dc52" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_55199e11-083d-4c40-8f5c-ea6a3635dc52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_b491d74d-48e8-4970-86c3-a0b1f013cbf4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:to="loc_us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts_b491d74d-48e8-4970-86c3-a0b1f013cbf4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_a80d9df1-b318-451a-bb25-6d81115cacfa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_a80d9df1-b318-451a-bb25-6d81115cacfa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_d0aa5628-ebf5-447d-9288-d78e923e546e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_d0aa5628-ebf5-447d-9288-d78e923e546e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_78c090c3-9e0d-4be6-b8d6-91d7b7a61738" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_62f2b6f7-e4c1-4730-a4f2-0a544e86c7d9" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_78c090c3-9e0d-4be6-b8d6-91d7b7a61738" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_745ce29c-155c-45ea-a54f-b891db42a4f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_78c090c3-9e0d-4be6-b8d6-91d7b7a61738" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_745ce29c-155c-45ea-a54f-b891db42a4f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_745ce29c-155c-45ea-a54f-b891db42a4f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_745ce29c-155c-45ea-a54f-b891db42a4f5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_745ce29c-155c-45ea-a54f-b891db42a4f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c6c7f5c0-90b9-47c7-80f0-2b47648a1ef4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_745ce29c-155c-45ea-a54f-b891db42a4f5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c6c7f5c0-90b9-47c7-80f0-2b47648a1ef4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_GeezeoMember_f1a28d13-da0a-4051-850c-5dc2b9867f6a" xlink:href="jkhy-20220630.xsd#jkhy_GeezeoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_c6c7f5c0-90b9-47c7-80f0-2b47648a1ef4" xlink:to="loc_jkhy_GeezeoMember_f1a28d13-da0a-4051-850c-5dc2b9867f6a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/ReportableSegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#ReportableSegmentInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/ReportableSegmentInformationNarrativeDetails" xlink:type="extended" id="i50dc4dc0126a40b983a23ca7613631d2_ReportableSegmentInformationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_1ffe4b8b-7f67-4454-b806-545c8ce754b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ReclassificationofRevenueBetweenReportableSegments_77bb94aa-570c-49d6-af6a-d56d24c3610a" xlink:href="jkhy-20220630.xsd#jkhy_ReclassificationofRevenueBetweenReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_1ffe4b8b-7f67-4454-b806-545c8ce754b9" xlink:to="loc_jkhy_ReclassificationofRevenueBetweenReportableSegments_77bb94aa-570c-49d6-af6a-d56d24c3610a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ReclassificationOfCostBetweenReportableSegments_f67a79e7-b92b-4f7a-82cd-61d7c75ba04d" xlink:href="jkhy-20220630.xsd#jkhy_ReclassificationOfCostBetweenReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_1ffe4b8b-7f67-4454-b806-545c8ce754b9" xlink:to="loc_jkhy_ReclassificationOfCostBetweenReportableSegments_f67a79e7-b92b-4f7a-82cd-61d7c75ba04d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a4770e92-db7b-4512-86df-fc113107fcb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_1ffe4b8b-7f67-4454-b806-545c8ce754b9" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a4770e92-db7b-4512-86df-fc113107fcb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_205f0071-182a-4960-96c7-cc2384b4957e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_1ffe4b8b-7f67-4454-b806-545c8ce754b9" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_205f0071-182a-4960-96c7-cc2384b4957e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_f37ab9e5-a1f7-4c6b-8364-721ea83f2767" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_205f0071-182a-4960-96c7-cc2384b4957e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_f37ab9e5-a1f7-4c6b-8364-721ea83f2767" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f37ab9e5-a1f7-4c6b-8364-721ea83f2767_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f37ab9e5-a1f7-4c6b-8364-721ea83f2767" xlink:to="loc_us-gaap_SegmentDomain_f37ab9e5-a1f7-4c6b-8364-721ea83f2767_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_893c6263-ee7e-4e7d-9fc8-edcc59cc3983" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f37ab9e5-a1f7-4c6b-8364-721ea83f2767" xlink:to="loc_us-gaap_SegmentDomain_893c6263-ee7e-4e7d-9fc8-edcc59cc3983" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CoreSegmentMember_d0e458f2-9891-4b72-8882-b4cb1472d1dc" xlink:href="jkhy-20220630.xsd#jkhy_CoreSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_893c6263-ee7e-4e7d-9fc8-edcc59cc3983" xlink:to="loc_jkhy_CoreSegmentMember_d0e458f2-9891-4b72-8882-b4cb1472d1dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PaymentsMember_d5c68c2a-a3a8-4f99-90fa-1e926bef6098" xlink:href="jkhy-20220630.xsd#jkhy_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_893c6263-ee7e-4e7d-9fc8-edcc59cc3983" xlink:to="loc_jkhy_PaymentsMember_d5c68c2a-a3a8-4f99-90fa-1e926bef6098" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ComplementaryMember_24b067f2-5bde-4e34-9fef-a6d8694f1123" xlink:href="jkhy-20220630.xsd#jkhy_ComplementaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_893c6263-ee7e-4e7d-9fc8-edcc59cc3983" xlink:to="loc_jkhy_ComplementaryMember_24b067f2-5bde-4e34-9fef-a6d8694f1123" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_db9a7cb0-44a6-4cb0-9782-59de1c85036e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_893c6263-ee7e-4e7d-9fc8-edcc59cc3983" xlink:to="loc_us-gaap_CorporateAndOtherMember_db9a7cb0-44a6-4cb0-9782-59de1c85036e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_d7934fe7-a910-4bea-af7f-1ef6734531bd" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_205f0071-182a-4960-96c7-cc2384b4957e" xlink:to="loc_srt_ProductOrServiceAxis_d7934fe7-a910-4bea-af7f-1ef6734531bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d7934fe7-a910-4bea-af7f-1ef6734531bd_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_d7934fe7-a910-4bea-af7f-1ef6734531bd" xlink:to="loc_srt_ProductsAndServicesDomain_d7934fe7-a910-4bea-af7f-1ef6734531bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_a65672f6-cd5c-4313-aff3-6639f585079a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_d7934fe7-a910-4bea-af7f-1ef6734531bd" xlink:to="loc_srt_ProductsAndServicesDomain_a65672f6-cd5c-4313-aff3-6639f585079a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndServiceMember_2db8bdad-da32-4676-bcdc-1d71cc94ea25" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LicenseAndServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_a65672f6-cd5c-4313-aff3-6639f585079a" xlink:to="loc_us-gaap_LicenseAndServiceMember_2db8bdad-da32-4676-bcdc-1d71cc94ea25" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails" xlink:type="extended" id="ibb5e4f6d3a8b40b7af3aa9e2a1989829_ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_59877910-f400-46e1-ac1b-44b11da282e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_59877910-f400-46e1-ac1b-44b11da282e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_0d9c3445-0a72-476b-ba71-306b6c74625e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_CostOfRevenue_0d9c3445-0a72-476b-ba71-306b6c74625e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_cfe75b38-c84c-4eeb-bc7d-2bdf4d986965" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_cfe75b38-c84c-4eeb-bc7d-2bdf4d986965" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_683df999-d38a-425e-908b-6b8955c3de66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_683df999-d38a-425e-908b-6b8955c3de66" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_d6ea9aa8-1f40-4836-a295-770016c0a4ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_CostsAndExpenses_d6ea9aa8-1f40-4836-a295-770016c0a4ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_6fa3502c-ee34-4cec-ba67-b7055d6f7693" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_GrossProfit_6fa3502c-ee34-4cec-ba67-b7055d6f7693" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_6b19a04a-2899-4943-827e-0b4de4c7bf02" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_OperatingIncomeLoss_6b19a04a-2899-4943-827e-0b4de4c7bf02" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_057c485f-7289-4c49-8262-dbc732ac697c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_057c485f-7289-4c49-8262-dbc732ac697c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_309c3487-ba71-4b6a-8d3b-8c0df0b321ff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_309c3487-ba71-4b6a-8d3b-8c0df0b321ff" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_bb154022-47a9-47d1-a148-92232ed033d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_2446609a-63e9-4ee4-b326-6d5fa3796e8c" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_bb154022-47a9-47d1-a148-92232ed033d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_68e10c8d-93c0-49fe-8a77-7fc2abec864a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_bb154022-47a9-47d1-a148-92232ed033d0" xlink:to="loc_srt_ProductOrServiceAxis_68e10c8d-93c0-49fe-8a77-7fc2abec864a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_68e10c8d-93c0-49fe-8a77-7fc2abec864a_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_68e10c8d-93c0-49fe-8a77-7fc2abec864a" xlink:to="loc_srt_ProductsAndServicesDomain_68e10c8d-93c0-49fe-8a77-7fc2abec864a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_da90b087-212d-40ed-995b-4f9200441878" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_68e10c8d-93c0-49fe-8a77-7fc2abec864a" xlink:to="loc_srt_ProductsAndServicesDomain_da90b087-212d-40ed-995b-4f9200441878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndServiceMember_f6250a61-6b53-4302-8e5f-bd0dc3aa3824" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LicenseAndServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da90b087-212d-40ed-995b-4f9200441878" xlink:to="loc_us-gaap_LicenseAndServiceMember_f6250a61-6b53-4302-8e5f-bd0dc3aa3824" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ProcessingMember_ddd71408-d17d-4bbf-b3d3-3df7328c75eb" xlink:href="jkhy-20220630.xsd#jkhy_ProcessingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_da90b087-212d-40ed-995b-4f9200441878" xlink:to="loc_jkhy_ProcessingMember_ddd71408-d17d-4bbf-b3d3-3df7328c75eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_25259409-416b-4b75-924f-e16070d36bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_bb154022-47a9-47d1-a148-92232ed033d0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_25259409-416b-4b75-924f-e16070d36bbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_25259409-416b-4b75-924f-e16070d36bbc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_25259409-416b-4b75-924f-e16070d36bbc" xlink:to="loc_us-gaap_SegmentDomain_25259409-416b-4b75-924f-e16070d36bbc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ca1ae45b-3792-4047-99ee-6836756f60c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_25259409-416b-4b75-924f-e16070d36bbc" xlink:to="loc_us-gaap_SegmentDomain_ca1ae45b-3792-4047-99ee-6836756f60c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CoreSegmentMember_c77f0832-f35a-4dc6-b65e-892aebe930cf" xlink:href="jkhy-20220630.xsd#jkhy_CoreSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca1ae45b-3792-4047-99ee-6836756f60c7" xlink:to="loc_jkhy_CoreSegmentMember_c77f0832-f35a-4dc6-b65e-892aebe930cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PaymentsMember_ad855365-c340-4e7c-8c1e-72e8cf3119d1" xlink:href="jkhy-20220630.xsd#jkhy_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca1ae45b-3792-4047-99ee-6836756f60c7" xlink:to="loc_jkhy_PaymentsMember_ad855365-c340-4e7c-8c1e-72e8cf3119d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ComplementaryMember_573722c5-1777-4628-badc-b0e0e1dcf675" xlink:href="jkhy-20220630.xsd#jkhy_ComplementaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca1ae45b-3792-4047-99ee-6836756f60c7" xlink:to="loc_jkhy_ComplementaryMember_573722c5-1777-4628-badc-b0e0e1dcf675" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_d0e5bebc-fca5-4f15-92a2-e3c5a8ed385a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CorporateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca1ae45b-3792-4047-99ee-6836756f60c7" xlink:to="loc_us-gaap_CorporateAndOtherMember_d0e5bebc-fca5-4f15-92a2-e3c5a8ed385a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="jkhy-20220630.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/SubsequentEventsDetails" xlink:type="extended" id="i95e09c327dc7422987cea199c50cc904_SubsequentEventsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfBuildings_0489d4d9-38b4-405c-8a9d-18646f87f960" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromSaleOfBuildings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_ProceedsFromSaleOfBuildings_0489d4d9-38b4-405c-8a9d-18646f87f960" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_aca2d1b8-9ea8-426d-b8e9-57673fb087b0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_aca2d1b8-9ea8-426d-b8e9-57673fb087b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_dd7647c3-c1ab-48a0-b158-1b1c5b863d33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_dd7647c3-c1ab-48a0-b158-1b1c5b863d33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_62ead3e1-908a-4c6e-89b5-824375b90c2a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsPayableDateDeclaredDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_DividendsPayableDateDeclaredDayMonthAndYear_62ead3e1-908a-4c6e-89b5-824375b90c2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_f044f20c-1f0d-4a88-a3f4-dd672c26afc9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_f044f20c-1f0d-4a88-a3f4-dd672c26afc9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_7259fb41-9292-40ba-ba92-5da74da0aee9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendPayableDateToBePaidDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_DividendPayableDateToBePaidDayMonthAndYear_7259fb41-9292-40ba-ba92-5da74da0aee9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_92bfad56-e7bf-4156-a895-7bfd2e6e9474" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsPayableDateOfRecordDayMonthAndYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_DividendsPayableDateOfRecordDayMonthAndYear_92bfad56-e7bf-4156-a895-7bfd2e6e9474" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_84205043-6e3d-459c-8187-2a31c63f6a9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_72123903-a545-4f59-b76e-3067839f5562" xlink:to="loc_us-gaap_SubsequentEventTable_84205043-6e3d-459c-8187-2a31c63f6a9b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_a01934cb-1f93-4c97-84c2-880735b19467" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_84205043-6e3d-459c-8187-2a31c63f6a9b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_a01934cb-1f93-4c97-84c2-880735b19467" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a01934cb-1f93-4c97-84c2-880735b19467_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a01934cb-1f93-4c97-84c2-880735b19467" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a01934cb-1f93-4c97-84c2-880735b19467_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c6353508-2072-4b99-9e46-ae02d73151f7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a01934cb-1f93-4c97-84c2-880735b19467" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c6353508-2072-4b99-9e46-ae02d73151f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_2f138b3f-ca4f-4c75-a74f-fe122195ad9b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_c6353508-2072-4b99-9e46-ae02d73151f7" xlink:to="loc_us-gaap_SubsequentEventMember_2f138b3f-ca4f-4c75-a74f-fe122195ad9b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-roles-2021-01-31.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_NotesPayableCurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
