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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:bc092021-333d-481e-a924-93fdfdb0c888,g:a3504fbb-924f-4298-81fc-d9f2d7000d40-->
<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/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="jkhy-20221231.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended" id="i17118275061b48ddb3ff51e390884104_CONDENSEDCONSOLIDATEDBALANCESHEETS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_048a79e1-8039-4e8f-b445-26d2965b6216" 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_53e2d437-fa20-4c51-93ba-fd97fc3e7ce9" 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_048a79e1-8039-4e8f-b445-26d2965b6216" xlink:to="loc_us-gaap_AssetsAbstract_53e2d437-fa20-4c51-93ba-fd97fc3e7ce9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" 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_53e2d437-fa20-4c51-93ba-fd97fc3e7ce9" xlink:to="loc_us-gaap_AssetsCurrentAbstract_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_c838413d-dafb-4e06-b631-d44b8c64cbdd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_c838413d-dafb-4e06-b631-d44b8c64cbdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_55c076eb-df38-4a4f-a5f7-ef8b204bc721" 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_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_55c076eb-df38-4a4f-a5f7-ef8b204bc721" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivable_9fcca444-fb55-40a5-8738-7bb426de87fc" 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_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_IncomeTaxesReceivable_9fcca444-fb55-40a5-8738-7bb426de87fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1f4a9c2b-96e6-4611-afa8-01909324e2f3" 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_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_1f4a9c2b-96e6-4611-afa8-01909324e2f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsCurrent_d948e389-4de6-482c-a22a-07e5838b1681" 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_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_DeferredCostsCurrent_d948e389-4de6-482c-a22a-07e5838b1681" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_b7e7a7d2-0833-4e91-a7c2-b31bba7e29d6" 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_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent_b7e7a7d2-0833-4e91-a7c2-b31bba7e29d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_c13339e9-fc3d-44a2-96fb-b205d54ec301" 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_d564abfa-5bc5-4174-8ed8-716b51aa8cf7" xlink:to="loc_us-gaap_AssetsCurrent_c13339e9-fc3d-44a2-96fb-b205d54ec301" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_88be7d49-29c1-48f2-a2c7-51bb575a14e4" 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_53e2d437-fa20-4c51-93ba-fd97fc3e7ce9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_88be7d49-29c1-48f2-a2c7-51bb575a14e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_53e2d437-fa20-4c51-93ba-fd97fc3e7ce9" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCosts_5ed81017-e7aa-45b7-9ac1-3482c334b80f" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_DeferredCosts_5ed81017-e7aa-45b7-9ac1-3482c334b80f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_76f4ea78-d167-448a-b954-764aac53b512" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_76f4ea78-d167-448a-b954-764aac53b512" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_c9e9937f-b6a0-46b8-8139-41226f736c58" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_c9e9937f-b6a0-46b8-8139-41226f736c58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_dc554538-2828-4c38-8152-384531d6d31d" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_dc554538-2828-4c38-8152-384531d6d31d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_99ba36c8-a6b3-449e-8200-b1f34965d2fb" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_99ba36c8-a6b3-449e-8200-b1f34965d2fb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ec3e396f-baaf-4867-a98b-c0d14328c501" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_Goodwill_ec3e396f-baaf-4867-a98b-c0d14328c501" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_ff4c1ba1-6473-4e8f-b997-3dd9c8496b74" 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_OtherAssetsNoncurrentAbstract_bdca31b1-ce34-47d0-b74c-041431095816" xlink:to="loc_us-gaap_AssetsNoncurrent_ff4c1ba1-6473-4e8f-b997-3dd9c8496b74" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_04deb390-9c31-4279-b8bd-4c2d70fbd58d" 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_AssetsAbstract_53e2d437-fa20-4c51-93ba-fd97fc3e7ce9" xlink:to="loc_us-gaap_Assets_04deb390-9c31-4279-b8bd-4c2d70fbd58d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_574c8dd5-b88d-4d3a-95b2-b1ba16a1fd4b" 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_048a79e1-8039-4e8f-b445-26d2965b6216" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_574c8dd5-b88d-4d3a-95b2-b1ba16a1fd4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_b898123d-d988-4a5b-85bc-c71851bb86ab" 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_574c8dd5-b88d-4d3a-95b2-b1ba16a1fd4b" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_fbae3297-299e-4798-98e6-3875d4eb7d5a" 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_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:to="loc_us-gaap_AccountsPayableCurrent_fbae3297-299e-4798-98e6-3875d4eb7d5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_c397af21-430a-494c-9260-da1e4e76f8e9" 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_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_c397af21-430a-494c-9260-da1e4e76f8e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_ecfcc896-28c8-46da-ae54-c4f48e79e31b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_ecfcc896-28c8-46da-ae54-c4f48e79e31b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_d9dcc22a-a420-4a25-a6c8-bbcfa03dae82" 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_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:to="loc_us-gaap_NotesPayableCurrent_d9dcc22a-a420-4a25-a6c8-bbcfa03dae82" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_a1495961-365b-4834-8de1-e31fd822f98d" 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_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_a1495961-365b-4834-8de1-e31fd822f98d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_f89b6d5c-b87d-490b-8273-9d917b70e85e" 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_b898123d-d988-4a5b-85bc-c71851bb86ab" xlink:to="loc_us-gaap_LiabilitiesCurrent_f89b6d5c-b87d-490b-8273-9d917b70e85e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_20f3dc23-8ded-44d4-b706-da2031f367be" 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_574c8dd5-b88d-4d3a-95b2-b1ba16a1fd4b" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_a8f3442a-b50e-484d-a64d-f8db47ddd80e" 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_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_a8f3442a-b50e-484d-a64d-f8db47ddd80e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_33613827-9011-427e-a6ea-a2df5bd194ac" 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_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_33613827-9011-427e-a6ea-a2df5bd194ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_dbc35df8-a2a3-49c4-b609-e4af15b310ce" 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_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_dbc35df8-a2a3-49c4-b609-e4af15b310ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_0d803d32-c169-4e96-82d7-37f8b178eaa6" 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_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_0d803d32-c169-4e96-82d7-37f8b178eaa6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_9b9c67d6-9b22-444d-bc4a-47ee55e1b7d8" 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_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_9b9c67d6-9b22-444d-bc4a-47ee55e1b7d8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_2186c18c-167a-4735-8857-cf1b18602808" 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_20f3dc23-8ded-44d4-b706-da2031f367be" xlink:to="loc_us-gaap_Liabilities_2186c18c-167a-4735-8857-cf1b18602808" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_1d7bbccc-31ee-4880-9a88-8ed80929b84c" 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_574c8dd5-b88d-4d3a-95b2-b1ba16a1fd4b" xlink:to="loc_us-gaap_StockholdersEquityAbstract_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_c42a16fc-2b62-4b20-83d1-f2b8ea6a6a73" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_c42a16fc-2b62-4b20-83d1-f2b8ea6a6a73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_bb40ba84-7fca-4271-8560-f4bfb06dd510" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_bb40ba84-7fca-4271-8560-f4bfb06dd510" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_06157cad-20a5-4bbb-8294-b129ffc0d2e2" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_PreferredStockSharesIssued_06157cad-20a5-4bbb-8294-b129ffc0d2e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_5fee8f01-1105-4b48-a088-ee4e4fbccc16" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_PreferredStockValue_5fee8f01-1105-4b48-a088-ee4e4fbccc16" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_5c15869f-b5a6-4644-b3ec-bad04f1e0ee8" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_5c15869f-b5a6-4644-b3ec-bad04f1e0ee8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_ecaad557-1d91-484a-9f94-62da88b2d196" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_ecaad557-1d91-484a-9f94-62da88b2d196" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_28b19f97-e9fe-4d9d-97a9-f576180e2eb8" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_CommonStockSharesIssued_28b19f97-e9fe-4d9d-97a9-f576180e2eb8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_47d8dea8-9936-4cf1-bcfb-adf360aed2b5" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_CommonStockValue_47d8dea8-9936-4cf1-bcfb-adf360aed2b5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_d740ee76-ce0f-4075-b47f-232a08666003" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_AdditionalPaidInCapital_d740ee76-ce0f-4075-b47f-232a08666003" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_e352e5b3-7506-40c0-9914-a412c35b9086" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_e352e5b3-7506-40c0-9914-a412c35b9086" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockShares_9d9ee079-18c2-47e0-89e6-abc0979c4d7d" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_TreasuryStockShares_9d9ee079-18c2-47e0-89e6-abc0979c4d7d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_62410a05-e629-467f-8631-9b2e41bbebc5" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_TreasuryStockValue_62410a05-e629-467f-8631-9b2e41bbebc5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_84748928-1e7b-407b-99c4-ebbfd0b0b458" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_StockholdersEquity_84748928-1e7b-407b-99c4-ebbfd0b0b458" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_3a927f2d-d714-477a-9686-2d6c53626beb" 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_1d7bbccc-31ee-4880-9a88-8ed80929b84c" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_3a927f2d-d714-477a-9686-2d6c53626beb" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_5cd289b3-ce54-4604-8fd7-532a1b4778db" 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_048a79e1-8039-4e8f-b445-26d2965b6216" xlink:to="loc_us-gaap_StatementTable_5cd289b3-ce54-4604-8fd7-532a1b4778db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_54ff0e76-a224-41b0-bf8a-111bd6aa64b6" 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_5cd289b3-ce54-4604-8fd7-532a1b4778db" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_54ff0e76-a224-41b0-bf8a-111bd6aa64b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_54ff0e76-a224-41b0-bf8a-111bd6aa64b6_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_54ff0e76-a224-41b0-bf8a-111bd6aa64b6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_54ff0e76-a224-41b0-bf8a-111bd6aa64b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0d54c7ad-5a28-42f5-944a-c2c46c2474fe" 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_54ff0e76-a224-41b0-bf8a-111bd6aa64b6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_0d54c7ad-5a28-42f5-944a-c2c46c2474fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_29c919a0-5e51-4873-9cf4-279401b9f995" 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_0d54c7ad-5a28-42f5-944a-c2c46c2474fe" xlink:to="loc_us-gaap_CustomerRelationshipsMember_29c919a0-5e51-4873-9cf4-279401b9f995" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYStatement" xlink:type="simple" xlink:href="jkhy-20221231.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYStatement"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYStatement" xlink:type="extended" id="id45acad464094e219d8ed7718bdd393c_CONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYStatement">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e562f936-f1c6-42eb-82df-06c4188d0071" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" 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_e562f936-f1c6-42eb-82df-06c4188d0071" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_dbe640bc-0500-4646-912d-ede6789ac7e9" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_dbe640bc-0500-4646-912d-ede6789ac7e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2d4e9684-8c50-4e23-8eef-e9f5aeb8084a" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_StockholdersEquity_2d4e9684-8c50-4e23-8eef-e9f5aeb8084a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1d1aa356-4f80-412a-94a9-f8247da4ce88" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_1d1aa356-4f80-412a-94a9-f8247da4ce88" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_9cbcdd9d-eb53-4523-bc0d-2d918f65c9e3" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_9cbcdd9d-eb53-4523-bc0d-2d918f65c9e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_92e1d2ac-0674-465c-9245-52aab307639d" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_92e1d2ac-0674-465c-9245-52aab307639d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_47cd1694-6ee2-415a-a9c5-0f62b5e0dfb8" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_47cd1694-6ee2-415a-a9c5-0f62b5e0dfb8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_6c6366ab-58c7-4084-960d-c3d59b71f285" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_6c6366ab-58c7-4084-960d-c3d59b71f285" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_c3960833-98ef-46b0-9042-79cbf93328a3" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_c3960833-98ef-46b0-9042-79cbf93328a3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0279a721-a45d-4b14-adcf-252d8aa0ed76" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_0279a721-a45d-4b14-adcf-252d8aa0ed76" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_87ea2095-9520-4dd5-9f03-90111c70d75b" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_NetIncomeLoss_87ea2095-9520-4dd5-9f03-90111c70d75b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_7bcee4d0-073d-4fb4-b940-04f943a48491" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_DividendsCommonStock_7bcee4d0-073d-4fb4-b940-04f943a48491" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_eb3e2af5-940f-42ae-8d9c-1996d0636d0c" 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_adb7cee6-8b46-4842-bd55-13a73d7c69b0" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_eb3e2af5-940f-42ae-8d9c-1996d0636d0c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_7f8b6b2f-203e-4473-aa45-6bdd60cdbbf3" 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_af70e514-77c3-4da7-9b4e-db2995683f18" 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_b5a74f15-3652-4cf7-a905-de3ac8ed6769" 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_e562f936-f1c6-42eb-82df-06c4188d0071" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_b5a74f15-3652-4cf7-a905-de3ac8ed6769" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_5d5fd598-1891-47bf-a598-856fc4b183da" 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_e562f936-f1c6-42eb-82df-06c4188d0071" xlink:to="loc_us-gaap_StatementTable_5d5fd598-1891-47bf-a598-856fc4b183da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_4b670b3b-b707-441d-a319-c92b7961dc15" 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_5d5fd598-1891-47bf-a598-856fc4b183da" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_4b670b3b-b707-441d-a319-c92b7961dc15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_4b670b3b-b707-441d-a319-c92b7961dc15_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_4b670b3b-b707-441d-a319-c92b7961dc15" xlink:to="loc_us-gaap_EquityComponentDomain_4b670b3b-b707-441d-a319-c92b7961dc15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" 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_4b670b3b-b707-441d-a319-c92b7961dc15" xlink:to="loc_us-gaap_EquityComponentDomain_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_ceac55fc-e042-46f7-ace0-89b3b135722b" 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_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" xlink:to="loc_us-gaap_PreferredStockMember_ceac55fc-e042-46f7-ace0-89b3b135722b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_4fe24003-288b-4993-a2bb-373a60bef5aa" 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_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" xlink:to="loc_us-gaap_CommonStockMember_4fe24003-288b-4993-a2bb-373a60bef5aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_660b2435-d945-48da-a5d1-ecd9780a99cd" 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_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_660b2435-d945-48da-a5d1-ecd9780a99cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_82e010eb-3f35-4790-852a-1d71bff7c0be" 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_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" xlink:to="loc_us-gaap_RetainedEarningsMember_82e010eb-3f35-4790-852a-1d71bff7c0be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_d715b49c-ceda-4625-a07c-979b58ce8cad" 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_5c207ed8-e4b7-4f8d-a909-e123c647ddc4" xlink:to="loc_us-gaap_TreasuryStockMember_d715b49c-ceda-4625-a07c-979b58ce8cad" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/BusinessAcquisitionsTables" xlink:type="simple" xlink:href="jkhy-20221231.xsd#BusinessAcquisitionsTables"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/BusinessAcquisitionsTables" xlink:type="extended" id="ie8cccf798bd543b783cbfd293a9a9b40_BusinessAcquisitionsTables">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_7ea5d167-c194-4ab2-8ef1-b325f4ddf809" 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_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_e84fa6ba-a922-4cf2-9678-61782c535eca" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7ea5d167-c194-4ab2-8ef1-b325f4ddf809" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_e84fa6ba-a922-4cf2-9678-61782c535eca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_1124225f-4e86-4c11-b174-81d5071259be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7ea5d167-c194-4ab2-8ef1-b325f4ddf809" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationTextBlock_1124225f-4e86-4c11-b174-81d5071259be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_59dc924d-2c86-4ac6-ac6a-da9c34ab54b5" 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_7ea5d167-c194-4ab2-8ef1-b325f4ddf809" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_59dc924d-2c86-4ac6-ac6a-da9c34ab54b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_60514c4e-944c-48fb-ac3d-26c9556f6439" 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_59dc924d-2c86-4ac6-ac6a-da9c34ab54b5" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_60514c4e-944c-48fb-ac3d-26c9556f6439" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_60514c4e-944c-48fb-ac3d-26c9556f6439_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_60514c4e-944c-48fb-ac3d-26c9556f6439" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_60514c4e-944c-48fb-ac3d-26c9556f6439_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aefebdc0-1494-4d61-bec1-496de2d384c0" 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_60514c4e-944c-48fb-ac3d-26c9556f6439" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aefebdc0-1494-4d61-bec1-496de2d384c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PayrailzMember_01ddc766-09e5-4752-b809-c82267ef6665" xlink:href="jkhy-20221231.xsd#jkhy_PayrailzMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_aefebdc0-1494-4d61-bec1-496de2d384c0" xlink:to="loc_jkhy_PayrailzMember_01ddc766-09e5-4752-b809-c82267ef6665" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesIntangibleAssetsDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#NatureofOperationsandSummaryofSignificantAccountingPoliciesIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesIntangibleAssetsDetails" xlink:type="extended" id="i798adad7109c4c428589c0947a947c95_NatureofOperationsandSummaryofSignificantAccountingPoliciesIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_fbc75da9-6471-445f-af58-79772eb56d0c" 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_FiniteLivedIntangibleAssetsAccumulatedAmortization_e32ea159-981c-4228-b6a1-7059a013c6a8" 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_StatementLineItems_fbc75da9-6471-445f-af58-79772eb56d0c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_e32ea159-981c-4228-b6a1-7059a013c6a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_ad6e9167-efa8-4861-86b4-4b96bfdbc4fd" 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_StatementLineItems_fbc75da9-6471-445f-af58-79772eb56d0c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_ad6e9167-efa8-4861-86b4-4b96bfdbc4fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_3e0635b0-ab14-4f22-b0db-9ee6c2d99879" 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_fbc75da9-6471-445f-af58-79772eb56d0c" xlink:to="loc_us-gaap_StatementTable_3e0635b0-ab14-4f22-b0db-9ee6c2d99879" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_37d69088-b402-43ca-8245-965c34616b90" 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_3e0635b0-ab14-4f22-b0db-9ee6c2d99879" xlink:to="loc_srt_RangeAxis_37d69088-b402-43ca-8245-965c34616b90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_37d69088-b402-43ca-8245-965c34616b90_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_37d69088-b402-43ca-8245-965c34616b90" xlink:to="loc_srt_RangeMember_37d69088-b402-43ca-8245-965c34616b90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a574027b-d804-4e7f-a96d-a1bac972b94d" 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_37d69088-b402-43ca-8245-965c34616b90" xlink:to="loc_srt_RangeMember_a574027b-d804-4e7f-a96d-a1bac972b94d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_efb98c1d-e943-41a5-bf07-3066b6b813f1" 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_a574027b-d804-4e7f-a96d-a1bac972b94d" xlink:to="loc_srt_MinimumMember_efb98c1d-e943-41a5-bf07-3066b6b813f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1a0851d0-8ef3-4ccf-ac49-7aacb1583827" 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_a574027b-d804-4e7f-a96d-a1bac972b94d" xlink:to="loc_srt_MaximumMember_1a0851d0-8ef3-4ccf-ac49-7aacb1583827" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentsDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentsDetails" xlink:type="extended" id="i74ef6ac7120249afad61b618f13d90ce_NatureofOperationsandSummaryofSignificantAccountingPoliciesPurchaseofInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_01ae66e3-67af-425b-8079-bad65c5bc80c" 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_InvestmentOwnedAtCost_413d7081-3460-4929-b5b0-470367ee3753" 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_StatementLineItems_01ae66e3-67af-425b-8079-bad65c5bc80c" xlink:to="loc_us-gaap_InvestmentOwnedAtCost_413d7081-3460-4929-b5b0-470367ee3753" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_c90be79b-e38c-4ac9-be0e-e8d47180a07a" 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_01ae66e3-67af-425b-8079-bad65c5bc80c" xlink:to="loc_us-gaap_StatementTable_c90be79b-e38c-4ac9-be0e-e8d47180a07a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2d861671-03f0-4744-b939-6ba22137269c" 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_StatementTable_c90be79b-e38c-4ac9-be0e-e8d47180a07a" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_2d861671-03f0-4744-b939-6ba22137269c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_2d861671-03f0-4744-b939-6ba22137269c_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_2d861671-03f0-4744-b939-6ba22137269c" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_2d861671-03f0-4744-b939-6ba22137269c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_18cd5011-ec43-4c10-a179-a711ffea655f" 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_2d861671-03f0-4744-b939-6ba22137269c" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_18cd5011-ec43-4c10-a179-a711ffea655f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AutomatedBookkeepingInc.Member_63dc5457-f7c4-476d-a94e-02502e163909" xlink:href="jkhy-20221231.xsd#jkhy_AutomatedBookkeepingInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_18cd5011-ec43-4c10-a179-a711ffea655f" xlink:to="loc_jkhy_AutomatedBookkeepingInc.Member_63dc5457-f7c4-476d-a94e-02502e163909" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_a36f9e26-9aeb-41a8-8cea-7d21d3fe39c7" 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_StatementTable_c90be79b-e38c-4ac9-be0e-e8d47180a07a" xlink:to="loc_us-gaap_FinancialInstrumentAxis_a36f9e26-9aeb-41a8-8cea-7d21d3fe39c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a36f9e26-9aeb-41a8-8cea-7d21d3fe39c7_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_a36f9e26-9aeb-41a8-8cea-7d21d3fe39c7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_a36f9e26-9aeb-41a8-8cea-7d21d3fe39c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_abc35757-0437-4791-81e1-2ae6fb33544a" 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_a36f9e26-9aeb-41a8-8cea-7d21d3fe39c7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_abc35757-0437-4791-81e1-2ae6fb33544a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_7655b64b-e96a-4e2a-8385-2bac763a34f7" 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_abc35757-0437-4791-81e1-2ae6fb33544a" xlink:to="loc_us-gaap_PreferredStockMember_7655b64b-e96a-4e2a-8385-2bac763a34f7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RevenueandDeferredCostsDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#RevenueandDeferredCostsDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RevenueandDeferredCostsDisaggregationofRevenueDetails" xlink:type="extended" id="ib55741ed50c342d5bba1fab588956a31_RevenueandDeferredCostsDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_f71a9f1f-cae3-4f8f-90bc-5fbe9065f849" 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_3ed1a5ea-2442-4f68-9448-de19d74481f8" 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_f71a9f1f-cae3-4f8f-90bc-5fbe9065f849" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3ed1a5ea-2442-4f68-9448-de19d74481f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_9170c67c-8ae8-4c55-978b-6f42a5ce8fef" 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_f71a9f1f-cae3-4f8f-90bc-5fbe9065f849" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_9170c67c-8ae8-4c55-978b-6f42a5ce8fef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_6d7a7f28-e2e9-4e15-8aa8-a2bc9960a166" 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_9170c67c-8ae8-4c55-978b-6f42a5ce8fef" xlink:to="loc_srt_ProductOrServiceAxis_6d7a7f28-e2e9-4e15-8aa8-a2bc9960a166" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6d7a7f28-e2e9-4e15-8aa8-a2bc9960a166_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_6d7a7f28-e2e9-4e15-8aa8-a2bc9960a166" xlink:to="loc_srt_ProductsAndServicesDomain_6d7a7f28-e2e9-4e15-8aa8-a2bc9960a166_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5abbbe48-37f0-4997-a2f4-39ee74950947" 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_6d7a7f28-e2e9-4e15-8aa8-a2bc9960a166" xlink:to="loc_srt_ProductsAndServicesDomain_5abbbe48-37f0-4997-a2f4-39ee74950947" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PrivatePublicCloudMember_9cad37ca-4e32-4e84-b35f-8eaf57ba44d5" xlink:href="jkhy-20221231.xsd#jkhy_PrivatePublicCloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5abbbe48-37f0-4997-a2f4-39ee74950947" xlink:to="loc_jkhy_PrivatePublicCloudMember_9cad37ca-4e32-4e84-b35f-8eaf57ba44d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ProductDeliveryandServiceMember_8dc84302-b1ce-4c19-aae2-34056b7cb239" xlink:href="jkhy-20221231.xsd#jkhy_ProductDeliveryandServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5abbbe48-37f0-4997-a2f4-39ee74950947" xlink:to="loc_jkhy_ProductDeliveryandServiceMember_8dc84302-b1ce-4c19-aae2-34056b7cb239" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_OnPremiseSupportMember_c9406d68-a3ae-4f10-a87a-21c49b99c0a7" xlink:href="jkhy-20221231.xsd#jkhy_OnPremiseSupportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5abbbe48-37f0-4997-a2f4-39ee74950947" xlink:to="loc_jkhy_OnPremiseSupportMember_c9406d68-a3ae-4f10-a87a-21c49b99c0a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndServiceMember_3063d0f3-7432-4122-b8c4-572a758fdfed" 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_5abbbe48-37f0-4997-a2f4-39ee74950947" xlink:to="loc_us-gaap_LicenseAndServiceMember_3063d0f3-7432-4122-b8c4-572a758fdfed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ProcessingMember_905eac98-8bb9-4fb1-8938-cb74c3953d1a" xlink:href="jkhy-20221231.xsd#jkhy_ProcessingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5abbbe48-37f0-4997-a2f4-39ee74950947" xlink:to="loc_jkhy_ProcessingMember_905eac98-8bb9-4fb1-8938-cb74c3953d1a" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RevenueandDeferredCostsRevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#RevenueandDeferredCostsRevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RevenueandDeferredCostsRevenueRecognitionNarrativeDetails" xlink:type="extended" id="i50190e2e791045f1a374b3dd05ee1ade_RevenueandDeferredCostsRevenueRecognitionNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ffa552b5-043a-4be2-948c-eb275de28bd6" 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_ecfdd1aa-2a29-4486-b30b-2c7b91a57841" 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_ffa552b5-043a-4be2-948c-eb275de28bd6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_ecfdd1aa-2a29-4486-b30b-2c7b91a57841" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6c7494b1-ce76-4b3b-a05a-02214bc5e1c0" 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_ffa552b5-043a-4be2-948c-eb275de28bd6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6c7494b1-ce76-4b3b-a05a-02214bc5e1c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e1f9111-0555-4e5e-b923-de9582ca06bd" 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_ffa552b5-043a-4be2-948c-eb275de28bd6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e1f9111-0555-4e5e-b923-de9582ca06bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_3420df4c-7c11-4080-be50-e5c7e1eeefae" 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_3e1f9111-0555-4e5e-b923-de9582ca06bd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_3420df4c-7c11-4080-be50-e5c7e1eeefae" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/RevenueandDeferredCostsRevenueRecognitionNarrativeDetails_1" xlink:type="simple" xlink:href="jkhy-20221231.xsd#RevenueandDeferredCostsRevenueRecognitionNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/RevenueandDeferredCostsRevenueRecognitionNarrativeDetails_1" xlink:type="extended" id="i7b9d3edba2b94ae7af007b104a50d3e7_RevenueandDeferredCostsRevenueRecognitionNarrativeDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_ffa552b5-043a-4be2-948c-eb275de28bd6" 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_ecfdd1aa-2a29-4486-b30b-2c7b91a57841" 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_ffa552b5-043a-4be2-948c-eb275de28bd6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_ecfdd1aa-2a29-4486-b30b-2c7b91a57841" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6c7494b1-ce76-4b3b-a05a-02214bc5e1c0" 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_ffa552b5-043a-4be2-948c-eb275de28bd6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_6c7494b1-ce76-4b3b-a05a-02214bc5e1c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e1f9111-0555-4e5e-b923-de9582ca06bd" 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_ffa552b5-043a-4be2-948c-eb275de28bd6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e1f9111-0555-4e5e-b923-de9582ca06bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/FairValueMeasuresandDisclosuresDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#FairValueMeasuresandDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/FairValueMeasuresandDisclosuresDetails" xlink:type="extended" id="i47a116394c97442fb0e4de5cdd77a925_FairValueMeasuresandDisclosuresDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_36affa52-dfc2-4aef-875f-c31a15e57219" 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_5737fb90-8d49-43eb-8c31-71b58867c211" 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_36affa52-dfc2-4aef-875f-c31a15e57219" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_5737fb90-8d49-43eb-8c31-71b58867c211" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LinesOfCreditFairValueDisclosure_423a0ac9-8ae6-4a87-bc30-1aacf0f38fb1" 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_36affa52-dfc2-4aef-875f-c31a15e57219" xlink:to="loc_us-gaap_LinesOfCreditFairValueDisclosure_423a0ac9-8ae6-4a87-bc30-1aacf0f38fb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ca276b34-b8a8-48be-9f31-02a90852dbed" 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_36affa52-dfc2-4aef-875f-c31a15e57219" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_ca276b34-b8a8-48be-9f31-02a90852dbed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_a499fe59-a6a0-434e-b0cc-b283975953ae" 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_ca276b34-b8a8-48be-9f31-02a90852dbed" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_a499fe59-a6a0-434e-b0cc-b283975953ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a499fe59-a6a0-434e-b0cc-b283975953ae_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_a499fe59-a6a0-434e-b0cc-b283975953ae" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a499fe59-a6a0-434e-b0cc-b283975953ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5d00e4a3-3495-4446-b3ec-31faa92ef7f0" 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_a499fe59-a6a0-434e-b0cc-b283975953ae" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_5d00e4a3-3495-4446-b3ec-31faa92ef7f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CertificatesOfDepositMember_3331950a-1b9e-4889-aca0-7752e241b5fe" 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_5d00e4a3-3495-4446-b3ec-31faa92ef7f0" xlink:to="loc_us-gaap_CertificatesOfDepositMember_3331950a-1b9e-4889-aca0-7752e241b5fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_783d2adb-acb2-4ecd-803f-a8e5b89e72f3" 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_5d00e4a3-3495-4446-b3ec-31faa92ef7f0" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_783d2adb-acb2-4ecd-803f-a8e5b89e72f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6ead6608-aa56-409a-a969-01e5eea83947" 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_ca276b34-b8a8-48be-9f31-02a90852dbed" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6ead6608-aa56-409a-a969-01e5eea83947" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6ead6608-aa56-409a-a969-01e5eea83947_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_6ead6608-aa56-409a-a969-01e5eea83947" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6ead6608-aa56-409a-a969-01e5eea83947_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2a212518-528b-40be-be4b-a32714d0b998" 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_6ead6608-aa56-409a-a969-01e5eea83947" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2a212518-528b-40be-be4b-a32714d0b998" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_88756aa9-c102-4034-84c4-6e7641a86ba9" 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_2a212518-528b-40be-be4b-a32714d0b998" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_88756aa9-c102-4034-84c4-6e7641a86ba9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_c66a41e6-229c-4434-95a4-4f278dc9f6c8" 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_2a212518-528b-40be-be4b-a32714d0b998" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_c66a41e6-229c-4434-95a4-4f278dc9f6c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_36571001-57b9-4ee0-8ecc-5a01bda66241" 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_2a212518-528b-40be-be4b-a32714d0b998" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_36571001-57b9-4ee0-8ecc-5a01bda66241" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_fee739fa-844a-4e41-bdae-c69df549efa1" 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_ca276b34-b8a8-48be-9f31-02a90852dbed" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_fee739fa-844a-4e41-bdae-c69df549efa1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_fee739fa-844a-4e41-bdae-c69df549efa1_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_fee739fa-844a-4e41-bdae-c69df549efa1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_fee739fa-844a-4e41-bdae-c69df549efa1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_fd5df4da-b715-4937-a630-806714d3d148" 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_fee739fa-844a-4e41-bdae-c69df549efa1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_fd5df4da-b715-4937-a630-806714d3d148" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_48700c0f-64f8-4538-aff3-c73105bc6624" 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_fd5df4da-b715-4937-a630-806714d3d148" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_48700c0f-64f8-4538-aff3-c73105bc6624" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/LeasesLeasesDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#LeasesLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/LeasesLeasesDetails" xlink:type="extended" id="i1318585e97694994ba464c454eb8f1d9_LeasesLeasesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" 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_LesseeOperatingLeaseTermOfContract_c841d227-5743-4b23-8608-fb53ef2d1f33" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_c841d227-5743-4b23-8608-fb53ef2d1f33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_6961f296-1491-4dd6-9670-bc29aa7d2dca" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_6961f296-1491-4dd6-9670-bc29aa7d2dca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_1ad68088-1e21-4023-9164-fd7839f39495" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_1ad68088-1e21-4023-9164-fd7839f39495" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_282554d0-ef7b-4b89-a201-66d588c16711" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseLiability_282554d0-ef7b-4b89-a201-66d588c16711" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_7302a6b0-9711-4555-acbd-602e7b290669" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_7302a6b0-9711-4555-acbd-602e7b290669" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_5e3b4be9-2b4f-4fec-a803-ed0b38170ff9" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_5e3b4be9-2b4f-4fec-a803-ed0b38170ff9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_909a4f96-bd2d-492e-8252-bb6d1ef4e114" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_909a4f96-bd2d-492e-8252-bb6d1ef4e114" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AccumulatedAmortizationOperatingLeaseRightofuseasset_82091e09-77ea-4120-bf8a-9ad2c56178a4" xlink:href="jkhy-20221231.xsd#jkhy_AccumulatedAmortizationOperatingLeaseRightofuseasset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_jkhy_AccumulatedAmortizationOperatingLeaseRightofuseasset_82091e09-77ea-4120-bf8a-9ad2c56178a4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AccumulatedAmortizationFinanceLeaseRightOfUseAsset_3e94694a-e749-4fdf-a051-3e166b9c1808" xlink:href="jkhy-20221231.xsd#jkhy_AccumulatedAmortizationFinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_jkhy_AccumulatedAmortizationFinanceLeaseRightOfUseAsset_3e94694a-e749-4fdf-a051-3e166b9c1808" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_06113bb8-3e1b-4e19-ac11-c27ef15c46bf" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseCost_06113bb8-3e1b-4e19-ac11-c27ef15c46bf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_9bab1bfb-2697-4cf0-b28a-d890f477d064" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_9bab1bfb-2697-4cf0-b28a-d890f477d064" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_aae3fa33-a19f-4304-8498-c02e09071a03" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_VariableLeaseCost_aae3fa33-a19f-4304-8498-c02e09071a03" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_056898e6-3d3f-4cea-af12-d518e3048368" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeasePayments_056898e6-3d3f-4cea-af12-d518e3048368" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_d97a8271-9e08-45e2-b451-d688396dfc69" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_d97a8271-9e08-45e2-b451-d688396dfc69" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_5f057a4b-ea61-40e0-83f3-2a7c8d683acd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinanceLeaseInterestPaymentOnLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_5f057a4b-ea61-40e0-83f3-2a7c8d683acd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_5340418d-dc95-4d54-8db3-a5d7f8d3be03" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_5340418d-dc95-4d54-8db3-a5d7f8d3be03" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_c27a8b4d-5a89-4939-ba05-b9f9fab925ca" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_c27a8b4d-5a89-4939-ba05-b9f9fab925ca" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_15b67f3a-c4f4-496b-b1f4-708100c4e515" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_15b67f3a-c4f4-496b-b1f4-708100c4e515" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_6b94c70b-53af-49fd-a23a-cadf7126eab2" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_6b94c70b-53af-49fd-a23a-cadf7126eab2" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_454968d9-f96c-48a3-89f1-a152eef96985" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_454968d9-f96c-48a3-89f1-a152eef96985" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_ccabea8a-db1d-4bc0-80be-1434d25f3ece" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_ccabea8a-db1d-4bc0-80be-1434d25f3ece" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_7e89ab07-3b0e-4c80-bc3a-d7c8b607fc39" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_7e89ab07-3b0e-4c80-bc3a-d7c8b607fc39" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_b9431ff0-1151-4087-bcbe-39e33a282a2d" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_b9431ff0-1151-4087-bcbe-39e33a282a2d" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_4d0b1655-21d0-4014-8068-a4151130a96e" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_4d0b1655-21d0-4014-8068-a4151130a96e" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_9140674a-140e-422d-b455-9bb0b15cf975" 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_StatementLineItems_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_9140674a-140e-422d-b455-9bb0b15cf975" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_f1831074-746e-44c6-9a3d-a2569831f62b" 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_ccd5550e-df83-426f-9af5-8fa16ffa12d7" xlink:to="loc_us-gaap_StatementTable_f1831074-746e-44c6-9a3d-a2569831f62b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_249dce06-b395-49d8-a736-24ffbb609352" 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_f1831074-746e-44c6-9a3d-a2569831f62b" xlink:to="loc_srt_RangeAxis_249dce06-b395-49d8-a736-24ffbb609352" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_249dce06-b395-49d8-a736-24ffbb609352_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_249dce06-b395-49d8-a736-24ffbb609352" xlink:to="loc_srt_RangeMember_249dce06-b395-49d8-a736-24ffbb609352_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_acd4f504-1367-42c8-bda4-274072a61c41" 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_249dce06-b395-49d8-a736-24ffbb609352" xlink:to="loc_srt_RangeMember_acd4f504-1367-42c8-bda4-274072a61c41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_908a81e0-4eef-41b1-9d39-d3f7bc7fa06c" 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_acd4f504-1367-42c8-bda4-274072a61c41" xlink:to="loc_srt_MinimumMember_908a81e0-4eef-41b1-9d39-d3f7bc7fa06c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_5ed7661d-2c80-4c65-afcf-bde30edf76ce" 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_acd4f504-1367-42c8-bda4-274072a61c41" xlink:to="loc_srt_MaximumMember_5ed7661d-2c80-4c65-afcf-bde30edf76ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_4fd1cdcd-b105-427a-9569-19c0915c15b9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f1831074-746e-44c6-9a3d-a2569831f62b" xlink:to="loc_us-gaap_OtherCommitmentsAxis_4fd1cdcd-b105-427a-9569-19c0915c15b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_4fd1cdcd-b105-427a-9569-19c0915c15b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_4fd1cdcd-b105-427a-9569-19c0915c15b9" xlink:to="loc_us-gaap_OtherCommitmentsDomain_4fd1cdcd-b105-427a-9569-19c0915c15b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_f914a2c3-3784-42e6-a6b1-5363a32e9fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_4fd1cdcd-b105-427a-9569-19c0915c15b9" xlink:to="loc_us-gaap_OtherCommitmentsDomain_f914a2c3-3784-42e6-a6b1-5363a32e9fcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsMember_1ff75ec2-df0d-448f-9561-15ae6107b153" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_f914a2c3-3784-42e6-a6b1-5363a32e9fcf" xlink:to="loc_us-gaap_CommitmentsMember_1ff75ec2-df0d-448f-9561-15ae6107b153" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/LeasesLeaseMaturityDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#LeasesLeaseMaturityDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/LeasesLeaseMaturityDetails" xlink:type="extended" id="iea117adbffca4af0aefec0a28eac0672_LeasesLeaseMaturityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" 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_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_19da34e3-0a79-4890-97f2-f614f163dade" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_19da34e3-0a79-4890-97f2-f614f163dade" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_3c3026db-a60f-4589-8053-d945a6478a14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_3c3026db-a60f-4589-8053-d945a6478a14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_3c8b4480-f569-46cd-8b71-fe3e72152575" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_3c8b4480-f569-46cd-8b71-fe3e72152575" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_19eba185-4768-4a6f-99cb-6cfbd0f5a779" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_19eba185-4768-4a6f-99cb-6cfbd0f5a779" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_d2c593b6-4c70-4ecf-bbe5-e8f40e689aab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_d2c593b6-4c70-4ecf-bbe5-e8f40e689aab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_1eed820b-7cc3-4174-b123-67e3799d2c45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_1eed820b-7cc3-4174-b123-67e3799d2c45" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_dcf8889b-879f-49d5-834e-0fe082dc43d1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_dcf8889b-879f-49d5-834e-0fe082dc43d1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5c093991-4957-48bc-88f5-2b72ad10dcbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_5c093991-4957-48bc-88f5-2b72ad10dcbb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_42b87d3e-9ccd-4147-bef8-589c659d0ac0" 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_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_OperatingLeaseLiability_42b87d3e-9ccd-4147-bef8-589c659d0ac0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_OperatingLeaseLiabilityOptionToExtendAmounts_2ffa146e-f5fb-4294-b50c-f16bdd374f78" xlink:href="jkhy-20221231.xsd#jkhy_OperatingLeaseLiabilityOptionToExtendAmounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_jkhy_OperatingLeaseLiabilityOptionToExtendAmounts_2ffa146e-f5fb-4294-b50c-f16bdd374f78" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_LesseeLeaseNotYetCommencedFutureMinimumPaymentsDue_d3c46b70-fb57-4369-8c58-3e1af5e44ca8" xlink:href="jkhy-20221231.xsd#jkhy_LesseeLeaseNotYetCommencedFutureMinimumPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_jkhy_LesseeLeaseNotYetCommencedFutureMinimumPaymentsDue_d3c46b70-fb57-4369-8c58-3e1af5e44ca8" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2c7f440c-b8be-4424-8b81-307c33f952b6" 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_557c5f64-df7a-4cf7-bdba-b9f9120b4136" xlink:to="loc_us-gaap_StatementTable_2c7f440c-b8be-4424-8b81-307c33f952b6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_cb6e1a67-8033-40b5-b4de-9fd56370de66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2c7f440c-b8be-4424-8b81-307c33f952b6" xlink:to="loc_us-gaap_OtherCommitmentsAxis_cb6e1a67-8033-40b5-b4de-9fd56370de66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_cb6e1a67-8033-40b5-b4de-9fd56370de66_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_cb6e1a67-8033-40b5-b4de-9fd56370de66" xlink:to="loc_us-gaap_OtherCommitmentsDomain_cb6e1a67-8033-40b5-b4de-9fd56370de66_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_c1cda470-5223-4186-b003-80de0844a6c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_cb6e1a67-8033-40b5-b4de-9fd56370de66" xlink:to="loc_us-gaap_OtherCommitmentsDomain_c1cda470-5223-4186-b003-80de0844a6c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsMember_7a072688-182d-4003-89d9-29744bb78d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_c1cda470-5223-4186-b003-80de0844a6c6" xlink:to="loc_us-gaap_CommitmentsMember_7a072688-182d-4003-89d9-29744bb78d7e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/DebtNarrativeDetails" xlink:type="extended" id="id078da27fb1e4ba7b87567e6fb8ef9a4_DebtNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" 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_LineOfCreditFacilityCurrentBorrowingCapacity_d4f8623c-b52e-41fe-973a-00b2f3250d19" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_d4f8623c-b52e-41fe-973a-00b2f3250d19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4a3c7939-a31e-4906-8564-6c29212142b4" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4a3c7939-a31e-4906-8564-6c29212142b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9f0097b6-749d-4a26-bcaa-6c71d0b78449" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9f0097b6-749d-4a26-bcaa-6c71d0b78449" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_7d9ad108-c3f8-455b-9e97-0f7183174087" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_7d9ad108-c3f8-455b-9e97-0f7183174087" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_4e75be78-fcdc-4e71-a8ee-8003e92abecd" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_LongTermDebt_4e75be78-fcdc-4e71-a8ee-8003e92abecd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9c460823-2a77-4cd9-a4b0-794c14c3a049" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount_9c460823-2a77-4cd9-a4b0-794c14c3a049" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentMaturityDate_504ba71b-adfe-419d-af68-437469663d59" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_DebtInstrumentMaturityDate_504ba71b-adfe-419d-af68-437469663d59" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_beccb815-89ba-4aa8-a0b8-1cf619e187ef" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_UnsecuredDebt_beccb815-89ba-4aa8-a0b8-1cf619e187ef" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaid_588d3892-4a73-4496-a70f-ff5acc45504a" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_InterestPaid_588d3892-4a73-4496-a70f-ff5acc45504a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d479e016-7002-4930-b3e7-acd6feeb8cd0" 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_7ab4cef6-e04b-468a-857f-2faf3fe7eb6c" xlink:to="loc_us-gaap_StatementTable_d479e016-7002-4930-b3e7-acd6feeb8cd0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_4b15cf1b-600b-4fc0-a567-3b10e58db5c0" 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_d479e016-7002-4930-b3e7-acd6feeb8cd0" xlink:to="loc_us-gaap_VariableRateAxis_4b15cf1b-600b-4fc0-a567-3b10e58db5c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_4b15cf1b-600b-4fc0-a567-3b10e58db5c0_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_4b15cf1b-600b-4fc0-a567-3b10e58db5c0" xlink:to="loc_us-gaap_VariableRateDomain_4b15cf1b-600b-4fc0-a567-3b10e58db5c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_dc9f8fa8-fb9f-43d4-a2e9-748b4eba5857" 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_4b15cf1b-600b-4fc0-a567-3b10e58db5c0" xlink:to="loc_us-gaap_VariableRateDomain_dc9f8fa8-fb9f-43d4-a2e9-748b4eba5857" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_3f29e2f2-a9c2-4b8b-a79c-9a2128a2bdc9" 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_dc9f8fa8-fb9f-43d4-a2e9-748b4eba5857" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_3f29e2f2-a9c2-4b8b-a79c-9a2128a2bdc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_2023bc4d-9536-4fc8-9ad0-a56bbbf43d15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_dc9f8fa8-fb9f-43d4-a2e9-748b4eba5857" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_2023bc4d-9536-4fc8-9ad0-a56bbbf43d15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_12f4f42a-af39-4a06-b470-d504894bc99c" 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_dc9f8fa8-fb9f-43d4-a2e9-748b4eba5857" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_12f4f42a-af39-4a06-b470-d504894bc99c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrimeRateMember_f3e9a37a-e4b6-41be-a6aa-fae4bcce89f7" 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_dc9f8fa8-fb9f-43d4-a2e9-748b4eba5857" xlink:to="loc_us-gaap_PrimeRateMember_f3e9a37a-e4b6-41be-a6aa-fae4bcce89f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_3f87c44e-ea65-44ff-993c-bdcb845eaae5" 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_d479e016-7002-4930-b3e7-acd6feeb8cd0" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_3f87c44e-ea65-44ff-993c-bdcb845eaae5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_3f87c44e-ea65-44ff-993c-bdcb845eaae5_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_3f87c44e-ea65-44ff-993c-bdcb845eaae5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_3f87c44e-ea65-44ff-993c-bdcb845eaae5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_38f9dc28-1277-4c9c-9155-f714ccce5f85" 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_3f87c44e-ea65-44ff-993c-bdcb845eaae5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_38f9dc28-1277-4c9c-9155-f714ccce5f85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_22cf96db-ab9b-4cff-92a9-f1371707be13" 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_38f9dc28-1277-4c9c-9155-f714ccce5f85" xlink:to="loc_us-gaap_LineOfCreditMember_22cf96db-ab9b-4cff-92a9-f1371707be13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_608c89db-4b8d-498d-b522-a0d6ad1033f7" 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_d479e016-7002-4930-b3e7-acd6feeb8cd0" xlink:to="loc_us-gaap_CreditFacilityAxis_608c89db-4b8d-498d-b522-a0d6ad1033f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_608c89db-4b8d-498d-b522-a0d6ad1033f7_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_608c89db-4b8d-498d-b522-a0d6ad1033f7" xlink:to="loc_us-gaap_CreditFacilityDomain_608c89db-4b8d-498d-b522-a0d6ad1033f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1522f5ba-0018-4303-a959-871ff3f3d0ab" 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_608c89db-4b8d-498d-b522-a0d6ad1033f7" xlink:to="loc_us-gaap_CreditFacilityDomain_1522f5ba-0018-4303-a959-871ff3f3d0ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_828060f7-524b-4f19-95b3-25158f4e78ce" 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_1522f5ba-0018-4303-a959-871ff3f3d0ab" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_828060f7-524b-4f19-95b3-25158f4e78ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_f95f139d-b5b3-4317-aea4-9f8de0175c11" 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_d479e016-7002-4930-b3e7-acd6feeb8cd0" xlink:to="loc_us-gaap_DebtInstrumentAxis_f95f139d-b5b3-4317-aea4-9f8de0175c11" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f95f139d-b5b3-4317-aea4-9f8de0175c11_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_f95f139d-b5b3-4317-aea4-9f8de0175c11" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f95f139d-b5b3-4317-aea4-9f8de0175c11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f9a86898-033f-4aaa-8bd2-a6cc81198ccc" 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_f95f139d-b5b3-4317-aea4-9f8de0175c11" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f9a86898-033f-4aaa-8bd2-a6cc81198ccc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_93a44f22-c269-4f58-bf71-e03b71772c87" 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_f9a86898-033f-4aaa-8bd2-a6cc81198ccc" xlink:to="loc_us-gaap_UnsecuredDebtMember_93a44f22-c269-4f58-bf71-e03b71772c87" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="id29668d5639c4db68fc35f4b7f7eb725_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e027017c-8edc-40f3-8b10-8b472559e037" 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_EffectiveIncomeTaxRateContinuingOperations_e94d27be-9076-46ad-aacd-d382bf9b47fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_e94d27be-9076-46ad-aacd-d382bf9b47fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_5b3cdfa3-e638-4346-bd9a-d346fc617111" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_5b3cdfa3-e638-4346-bd9a-d346fc617111" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_7af9ddba-9faa-4a7b-a011-3b00b6bb8f91" 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_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_7af9ddba-9faa-4a7b-a011-3b00b6bb8f91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_b1275e88-4576-4ec0-af77-8144221ab6bc" 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_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_b1275e88-4576-4ec0-af77-8144221ab6bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_4ed7ee65-9cc1-49a3-b943-5b22af77d769" 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_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_4ed7ee65-9cc1-49a3-b943-5b22af77d769" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_e2088cbf-415a-4319-9932-6b26f0689397" 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_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible_e2088cbf-415a-4319-9932-6b26f0689397" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_ec91fb21-b77f-4209-a6e1-3c8df8908104" 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_e027017c-8edc-40f3-8b10-8b472559e037" xlink:to="loc_us-gaap_StatementTable_ec91fb21-b77f-4209-a6e1-3c8df8908104" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_280ad1b5-2dfe-4781-8863-1964812be364" 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_ec91fb21-b77f-4209-a6e1-3c8df8908104" xlink:to="loc_srt_RangeAxis_280ad1b5-2dfe-4781-8863-1964812be364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_280ad1b5-2dfe-4781-8863-1964812be364_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_280ad1b5-2dfe-4781-8863-1964812be364" xlink:to="loc_srt_RangeMember_280ad1b5-2dfe-4781-8863-1964812be364_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_79e1a1cb-38e3-4a96-b3ee-75fcbdbdc390" 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_280ad1b5-2dfe-4781-8863-1964812be364" xlink:to="loc_srt_RangeMember_79e1a1cb-38e3-4a96-b3ee-75fcbdbdc390" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ea6ffa95-bd18-44d7-aafe-add6f2a49a1c" 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_79e1a1cb-38e3-4a96-b3ee-75fcbdbdc390" xlink:to="loc_srt_MinimumMember_ea6ffa95-bd18-44d7-aafe-add6f2a49a1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a4bb6362-2256-41ba-a1bc-14a8a9a8b38c" 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_79e1a1cb-38e3-4a96-b3ee-75fcbdbdc390" xlink:to="loc_srt_MaximumMember_a4bb6362-2256-41ba-a1bc-14a8a9a8b38c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended" id="i486d277993414ec19f32313a06d545cb_StockBasedCompensationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_139f47d8-9163-44b1-8289-f6866834aaba" 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_c940b144-7ed6-412b-9339-b1a9769e3564" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_ShareBasedCompensation_c940b144-7ed6-412b-9339-b1a9769e3564" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_3bda09ac-09f7-4d45-85b8-92e4fd70b1e5" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_3bda09ac-09f7-4d45-85b8-92e4fd70b1e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1_ffefb157-673f-4f7a-8fc5-f45f160d0fa6" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1_ffefb157-673f-4f7a-8fc5-f45f160d0fa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterTerminationOfEmployment_9d63cd99-10cb-430e-97a5-6c9bb468fec5" xlink:href="jkhy-20221231.xsd#jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterTerminationOfEmployment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterTerminationOfEmployment_9d63cd99-10cb-430e-97a5-6c9bb468fec5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterDeath_fc26b6ff-e4a2-45a6-9a4a-dc610a6c727b" xlink:href="jkhy-20221231.xsd#jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterDeath"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationPeriodAfterDeath_fc26b6ff-e4a2-45a6-9a4a-dc610a6c727b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationAfterGrantDate_ad0c8640-963a-4d90-b315-f391bb5efe61" xlink:href="jkhy-20221231.xsd#jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationAfterGrantDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_jkhy_ShareBasedCompensationArrangementByShareBasedPaymentAwardTerminationAfterGrantDate_ad0c8640-963a-4d90-b315-f391bb5efe61" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_519938ae-1134-4cd9-8dc8-7d1781759385" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_519938ae-1134-4cd9-8dc8-7d1781759385" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_251100d1-4963-4513-8eb3-b63d7f63c828" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_251100d1-4963-4513-8eb3-b63d7f63c828" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_4b10cee0-013b-4bad-82c1-fa918a0f33a7" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_4b10cee0-013b-4bad-82c1-fa918a0f33a7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e2f7eec7-29ae-452f-83fa-9c218350b46b" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e2f7eec7-29ae-452f-83fa-9c218350b46b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6c20f654-4212-496c-bc8b-81f40db6365b" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_6c20f654-4212-496c-bc8b-81f40db6365b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_50553436-2b67-44cf-b8b1-bfde0209a76d" 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_139f47d8-9163-44b1-8289-f6866834aaba" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_50553436-2b67-44cf-b8b1-bfde0209a76d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_b48874ce-7900-4602-8396-73785e3d38d6" 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_50553436-2b67-44cf-b8b1-bfde0209a76d" xlink:to="loc_us-gaap_ValuationTechniqueAxis_b48874ce-7900-4602-8396-73785e3d38d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_b48874ce-7900-4602-8396-73785e3d38d6_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_b48874ce-7900-4602-8396-73785e3d38d6" xlink:to="loc_us-gaap_ValuationTechniqueDomain_b48874ce-7900-4602-8396-73785e3d38d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_4a3580cc-40c5-4a31-a674-ee76de5fd345" 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_b48874ce-7900-4602-8396-73785e3d38d6" xlink:to="loc_us-gaap_ValuationTechniqueDomain_4a3580cc-40c5-4a31-a674-ee76de5fd345" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueongrantdatelessPVofdividendsMember_0de6748c-5247-4083-8def-18ea2c06488a" xlink:href="jkhy-20221231.xsd#jkhy_FairvalueongrantdatelessPVofdividendsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_4a3580cc-40c5-4a31-a674-ee76de5fd345" xlink:to="loc_jkhy_FairvalueongrantdatelessPVofdividendsMember_0de6748c-5247-4083-8def-18ea2c06488a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueunderMonteCarloMember_b994c42c-3734-4ee3-b4be-5082dea339d8" xlink:href="jkhy-20221231.xsd#jkhy_FairvalueunderMonteCarloMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_4a3580cc-40c5-4a31-a674-ee76de5fd345" xlink:to="loc_jkhy_FairvalueunderMonteCarloMember_b994c42c-3734-4ee3-b4be-5082dea339d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_537871ed-d332-46e1-8a25-9eee7ce1ce05" 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_50553436-2b67-44cf-b8b1-bfde0209a76d" xlink:to="loc_us-gaap_PlanNameAxis_537871ed-d332-46e1-8a25-9eee7ce1ce05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_537871ed-d332-46e1-8a25-9eee7ce1ce05_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_537871ed-d332-46e1-8a25-9eee7ce1ce05" xlink:to="loc_us-gaap_PlanNameDomain_537871ed-d332-46e1-8a25-9eee7ce1ce05_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a36b19d9-50e8-4faa-bdb1-2ced7e950ca8" 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_537871ed-d332-46e1-8a25-9eee7ce1ce05" xlink:to="loc_us-gaap_PlanNameDomain_a36b19d9-50e8-4faa-bdb1-2ced7e950ca8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_A2015EIPMember_dad46e48-20c8-4fe8-ad12-628353113006" xlink:href="jkhy-20221231.xsd#jkhy_A2015EIPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a36b19d9-50e8-4faa-bdb1-2ced7e950ca8" xlink:to="loc_jkhy_A2015EIPMember_dad46e48-20c8-4fe8-ad12-628353113006" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fe03503b-32bb-40a9-8604-83d70dd2512e" 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_50553436-2b67-44cf-b8b1-bfde0209a76d" xlink:to="loc_us-gaap_AwardTypeAxis_fe03503b-32bb-40a9-8604-83d70dd2512e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fe03503b-32bb-40a9-8604-83d70dd2512e_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_fe03503b-32bb-40a9-8604-83d70dd2512e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fe03503b-32bb-40a9-8604-83d70dd2512e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4acf30d-9a37-4afb-a357-f143e98eaf09" 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_fe03503b-32bb-40a9-8604-83d70dd2512e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4acf30d-9a37-4afb-a357-f143e98eaf09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_82d6b942-5d7e-4732-ab53-ebd1f486b9f5" 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_e4acf30d-9a37-4afb-a357-f143e98eaf09" xlink:to="loc_us-gaap_EmployeeStockOptionMember_82d6b942-5d7e-4732-ab53-ebd1f486b9f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_2e3a0356-1c38-451a-b98b-f839f8cd9650" 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_e4acf30d-9a37-4afb-a357-f143e98eaf09" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_2e3a0356-1c38-451a-b98b-f839f8cd9650" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_9d1eaa34-3594-4eb3-8a98-2ae5f80a5a39" 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_e4acf30d-9a37-4afb-a357-f143e98eaf09" xlink:to="loc_us-gaap_PerformanceSharesMember_9d1eaa34-3594-4eb3-8a98-2ae5f80a5a39" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/StockBasedCompensationStockOptionsDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#StockBasedCompensationStockOptionsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/StockBasedCompensationStockOptionsDetails" xlink:type="extended" id="i9c5a850d724c4dfdbc825e89a3db4650_StockBasedCompensationStockOptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_63531c93-2466-47d0-934d-c756d847adc4" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" 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_63531c93-2466-47d0-934d-c756d847adc4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_31f4bbc7-d789-44f1-848a-46aa073abe3b" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_31f4bbc7-d789-44f1-848a-46aa073abe3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_374323e6-3c39-48b1-86f3-75272e7c2179" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod_374323e6-3c39-48b1-86f3-75272e7c2179" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_3348437c-72ce-4f06-979c-cb86c339ab60" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_3348437c-72ce-4f06-979c-cb86c339ab60" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_450ce2e1-9d2d-4169-9b13-fb088805b245" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_450ce2e1-9d2d-4169-9b13-fb088805b245" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_c67b52ec-72ec-424a-b0b4-fcc71578382c" 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_98e30cc0-1f25-4bf9-b242-310886fb8390" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_98e30cc0-1f25-4bf9-b242-310886fb8390" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_b62af373-7688-43e0-9771-298a70d0a327" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_b62af373-7688-43e0-9771-298a70d0a327" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_e925017f-5d37-45f5-89b7-a61b3f408fc5" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice_e925017f-5d37-45f5-89b7-a61b3f408fc5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_4f2255fc-5d3c-49cf-a60d-3d9f6120b83e" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_4f2255fc-5d3c-49cf-a60d-3d9f6120b83e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_7d32c58d-066b-4709-9d93-0d6adc4540d2" 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_ab9b7905-3f2d-4675-a593-70560aec43c6" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_ab9b7905-3f2d-4675-a593-70560aec43c6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_1b36cf30-d779-4cc3-b5e7-ef950d6391e4" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_1b36cf30-d779-4cc3-b5e7-ef950d6391e4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_5886a2e9-de7f-499e-96eb-3996351a22cf" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_5886a2e9-de7f-499e-96eb-3996351a22cf" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_f0404a7c-a293-457b-bf20-3bca24dc6654" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue_f0404a7c-a293-457b-bf20-3bca24dc6654" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_cb475b67-aab7-45b5-9600-622ce2e8f8aa" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_cb475b67-aab7-45b5-9600-622ce2e8f8aa" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_901fc475-2763-4d0e-9654-315ac4486b4a" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_901fc475-2763-4d0e-9654-315ac4486b4a" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_5530fdd8-669f-4cf7-84fb-e6ff98fc3561" 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_b5bb88f0-e921-4763-bc10-74ddc10835c3" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_5530fdd8-669f-4cf7-84fb-e6ff98fc3561" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d1942782-7eb2-47e7-a599-872b376135a6" 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_63531c93-2466-47d0-934d-c756d847adc4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d1942782-7eb2-47e7-a599-872b376135a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_bb0b115e-abac-4350-959a-7bf812c1d2ff" 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_d1942782-7eb2-47e7-a599-872b376135a6" xlink:to="loc_us-gaap_AwardTypeAxis_bb0b115e-abac-4350-959a-7bf812c1d2ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb0b115e-abac-4350-959a-7bf812c1d2ff_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_bb0b115e-abac-4350-959a-7bf812c1d2ff" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_bb0b115e-abac-4350-959a-7bf812c1d2ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_97b8f417-a093-435f-b082-35b1369619ac" 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_bb0b115e-abac-4350-959a-7bf812c1d2ff" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_97b8f417-a093-435f-b082-35b1369619ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_99bee24e-ab90-450f-8c37-9d5b6cacf2e4" 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_97b8f417-a093-435f-b082-35b1369619ac" xlink:to="loc_us-gaap_EmployeeStockOptionMember_99bee24e-ab90-450f-8c37-9d5b6cacf2e4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/StockBasedCompensationRestrictedStockUnitAwardsDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#StockBasedCompensationRestrictedStockUnitAwardsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/StockBasedCompensationRestrictedStockUnitAwardsDetails" xlink:type="extended" id="ief1a84e50ab84a5c8b9c7f06fe2ea758_StockBasedCompensationRestrictedStockUnitAwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_edd9d31e-a408-4dbc-95e3-e35f86c7b423" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" 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_edd9d31e-a408-4dbc-95e3-e35f86c7b423" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_84e01ae0-b468-4f49-8fd6-bb291a1e74ca" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_84e01ae0-b468-4f49-8fd6-bb291a1e74ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5c8b81ff-79bb-436d-bcfa-1ae76912f9bf" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_5c8b81ff-79bb-436d-bcfa-1ae76912f9bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3dd3899b-49d0-4edf-bd59-2c48e086a24c" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3dd3899b-49d0-4edf-bd59-2c48e086a24c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_9ae921ae-c562-4d77-bfbb-c4541e9f0772" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_9ae921ae-c562-4d77-bfbb-c4541e9f0772" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0a66f607-f7b4-47f4-90d7-93e526bb3c42" 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_3ea364c6-c639-4908-b981-dba393c3d79b" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_3ea364c6-c639-4908-b981-dba393c3d79b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_fec2f94b-7e67-4d4c-a935-29e016fe68a3" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_fec2f94b-7e67-4d4c-a935-29e016fe68a3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6e190bf6-cd8d-4404-83e3-4decc6d6455c" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6e190bf6-cd8d-4404-83e3-4decc6d6455c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b7089121-d5f5-4512-9e61-dae3d8fa2979" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b7089121-d5f5-4512-9e61-dae3d8fa2979" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_7cfd61a0-cc33-4e59-b6d6-cea062da5dd2" 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_52c810be-b300-4ef6-82d2-35e9a2ddf865" 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_d9b39108-f1c3-4899-b792-fcd0860826ac" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_52c810be-b300-4ef6-82d2-35e9a2ddf865" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_79d2d5df-30ed-4a82-8dd4-00d4f0c26b0e" 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_edd9d31e-a408-4dbc-95e3-e35f86c7b423" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_79d2d5df-30ed-4a82-8dd4-00d4f0c26b0e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_7b2c640a-8a19-499a-bc5a-e4f9ccb1126e" 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_79d2d5df-30ed-4a82-8dd4-00d4f0c26b0e" xlink:to="loc_us-gaap_ValuationTechniqueAxis_7b2c640a-8a19-499a-bc5a-e4f9ccb1126e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_7b2c640a-8a19-499a-bc5a-e4f9ccb1126e_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_7b2c640a-8a19-499a-bc5a-e4f9ccb1126e" xlink:to="loc_us-gaap_ValuationTechniqueDomain_7b2c640a-8a19-499a-bc5a-e4f9ccb1126e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_e5719700-c942-4448-8b9e-cc766fe6ffe0" 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_7b2c640a-8a19-499a-bc5a-e4f9ccb1126e" xlink:to="loc_us-gaap_ValuationTechniqueDomain_e5719700-c942-4448-8b9e-cc766fe6ffe0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_FairvalueunderMonteCarloMember_35e39345-847e-456a-aebb-fd30618d9739" xlink:href="jkhy-20221231.xsd#jkhy_FairvalueunderMonteCarloMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_e5719700-c942-4448-8b9e-cc766fe6ffe0" xlink:to="loc_jkhy_FairvalueunderMonteCarloMember_35e39345-847e-456a-aebb-fd30618d9739" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b7e687a0-294e-410c-863a-0a3983c2c4cb" 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_79d2d5df-30ed-4a82-8dd4-00d4f0c26b0e" xlink:to="loc_us-gaap_AwardTypeAxis_b7e687a0-294e-410c-863a-0a3983c2c4cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b7e687a0-294e-410c-863a-0a3983c2c4cb_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_b7e687a0-294e-410c-863a-0a3983c2c4cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b7e687a0-294e-410c-863a-0a3983c2c4cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b5f1a88c-19b1-44bf-ba9e-0c8184ce775e" 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_b7e687a0-294e-410c-863a-0a3983c2c4cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b5f1a88c-19b1-44bf-ba9e-0c8184ce775e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_26d75669-7abe-4cee-829c-430f1301cadc" 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_b5f1a88c-19b1-44bf-ba9e-0c8184ce775e" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_26d75669-7abe-4cee-829c-430f1301cadc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/StockBasedCompensationRSUMeasurementDateAssumptionsDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#StockBasedCompensationRSUMeasurementDateAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/StockBasedCompensationRSUMeasurementDateAssumptionsDetails" xlink:type="extended" id="i4a2c8fb0a18f4dd2af3409d8a437093f_StockBasedCompensationRSUMeasurementDateAssumptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1c1f855a-71b4-4e85-a1d4-78835a98d937" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_1c1f855a-71b4-4e85-a1d4-78835a98d937" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_37c5c097-999d-44f4-9587-cfbab1f159e7" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_37c5c097-999d-44f4-9587-cfbab1f159e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_511f7799-13d0-49d7-ba62-346104eab0c8" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments_511f7799-13d0-49d7-ba62-346104eab0c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_d59524c5-5814-4323-bff4-633418161e9f" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_d59524c5-5814-4323-bff4-633418161e9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_BeginningAveragePercentileRankForTSR_010a9ec9-cf2d-42bf-86c6-f78aef6713fa" xlink:href="jkhy-20221231.xsd#jkhy_BeginningAveragePercentileRankForTSR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:to="loc_jkhy_BeginningAveragePercentileRankForTSR_010a9ec9-cf2d-42bf-86c6-f78aef6713fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7739906b-c454-497e-8830-1e55638f680d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_4088e485-a266-435d-bf8a-2d99a04ad99a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7739906b-c454-497e-8830-1e55638f680d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_e223c54b-15cf-40b9-ae05-0f3829a13aba" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7739906b-c454-497e-8830-1e55638f680d" xlink:to="loc_us-gaap_ValuationTechniqueAxis_e223c54b-15cf-40b9-ae05-0f3829a13aba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_e223c54b-15cf-40b9-ae05-0f3829a13aba_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_e223c54b-15cf-40b9-ae05-0f3829a13aba" xlink:to="loc_us-gaap_ValuationTechniqueDomain_e223c54b-15cf-40b9-ae05-0f3829a13aba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_5076403d-4ba6-4315-9074-82d98126990e" 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_e223c54b-15cf-40b9-ae05-0f3829a13aba" xlink:to="loc_us-gaap_ValuationTechniqueDomain_5076403d-4ba6-4315-9074-82d98126990e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CompensationPeerGroupMember_5cb1a7e7-9257-45cd-a08c-81e1132bc65a" xlink:href="jkhy-20221231.xsd#jkhy_CompensationPeerGroupMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_5076403d-4ba6-4315-9074-82d98126990e" xlink:to="loc_jkhy_CompensationPeerGroupMember_5cb1a7e7-9257-45cd-a08c-81e1132bc65a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_a6f528c3-df32-4e0f-98c7-bd83e3795ba3" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_7739906b-c454-497e-8830-1e55638f680d" xlink:to="loc_us-gaap_AwardTypeAxis_a6f528c3-df32-4e0f-98c7-bd83e3795ba3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a6f528c3-df32-4e0f-98c7-bd83e3795ba3_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_a6f528c3-df32-4e0f-98c7-bd83e3795ba3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_a6f528c3-df32-4e0f-98c7-bd83e3795ba3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2151986-d4ec-4b97-b59e-3b02bae698c0" 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_a6f528c3-df32-4e0f-98c7-bd83e3795ba3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2151986-d4ec-4b97-b59e-3b02bae698c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_be6a7ca4-d8b1-4d04-a812-9409e35c5c27" 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_c2151986-d4ec-4b97-b59e-3b02bae698c0" xlink:to="loc_us-gaap_PerformanceSharesMember_be6a7ca4-d8b1-4d04-a812-9409e35c5c27" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/BusinessAcquisitionsDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#BusinessAcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/BusinessAcquisitionsDetails" xlink:type="extended" id="ibb9c3fbb59db4dac8b99f151922f18b1_BusinessAcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" 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_f8b88c63-dc2d-46e5-9bb2-58b05f285c19" 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_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessAcquisitionEffectiveDateOfAcquisition1_f8b88c63-dc2d-46e5-9bb2-58b05f285c19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_72ecc30d-c98e-48f9-abfa-86b7e5415665" 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_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_72ecc30d-c98e-48f9-abfa-86b7e5415665" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_EscrowDepositRelatedToAcquisitionTotal_0291bdeb-4ef7-42ee-8eda-1f9866ceefe9" xlink:href="jkhy-20221231.xsd#jkhy_EscrowDepositRelatedToAcquisitionTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_jkhy_EscrowDepositRelatedToAcquisitionTotal_0291bdeb-4ef7-42ee-8eda-1f9866ceefe9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_EscrowDepositFinalPurchasePriceAdjustment_0c70ea16-1dbf-4c10-8b74-ee066b1769aa" xlink:href="jkhy-20221231.xsd#jkhy_EscrowDepositFinalPurchasePriceAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_jkhy_EscrowDepositFinalPurchasePriceAdjustment_0c70ea16-1dbf-4c10-8b74-ee066b1769aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_EscrowDepositIndemnificationMatters_65d74a7f-9ab8-4ac6-8769-5d691f35f20c" xlink:href="jkhy-20221231.xsd#jkhy_EscrowDepositIndemnificationMatters"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_jkhy_EscrowDepositIndemnificationMatters_65d74a7f-9ab8-4ac6-8769-5d691f35f20c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_dbac904a-0f50-412b-913e-5060c81436d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_dbac904a-0f50-412b-913e-5060c81436d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_8d83e37e-859f-48d5-95d1-1c06fd941541" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_8d83e37e-859f-48d5-95d1-1c06fd941541" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_e5f42d2f-0b22-4bef-aaf1-ae5d19c901ed" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_e5f42d2f-0b22-4bef-aaf1-ae5d19c901ed" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_52e3fc56-3fe9-47e5-a3a6-cd7fd60fccf6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_52e3fc56-3fe9-47e5-a3a6-cd7fd60fccf6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_af0ef5ca-3540-4001-85ec-0840aedf1018" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_af0ef5ca-3540-4001-85ec-0840aedf1018" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_7d99cdb4-158c-4def-9172-f41ced4b155a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_7d99cdb4-158c-4def-9172-f41ced4b155a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_9fb6c753-67d9-4162-986c-8075cebef228" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_9fb6c753-67d9-4162-986c-8075cebef228" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_bc2ab948-7bf5-4436-ad21-dcbe0d6399a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_bc2ab948-7bf5-4436-ad21-dcbe0d6399a7" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_5936c345-59e0-4660-a65f-a3dbc7f729a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_5936c345-59e0-4660-a65f-a3dbc7f729a8" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b115a35e-0190-4c23-ab54-ce3f383e1c61" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b115a35e-0190-4c23-ab54-ce3f383e1c61" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_bf83def3-d807-4401-ab6f-b3140efd2970" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_bf83def3-d807-4401-ab6f-b3140efd2970" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_055382ce-7ffa-483f-a404-2ab44ab7a549" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_055382ce-7ffa-483f-a404-2ab44ab7a549" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_eaf0d92d-1533-45cf-a078-bdb0e8f8760c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_eaf0d92d-1533-45cf-a078-bdb0e8f8760c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_649aa459-4d76-4f44-bf06-31f005059ab6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_649aa459-4d76-4f44-bf06-31f005059ab6" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_ac928f2f-31bf-47a6-81d4-758b0f4c84f8" 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_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_ac928f2f-31bf-47a6-81d4-758b0f4c84f8" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_57bfaa96-4d21-4031-8b95-3dc73f5a56a6" 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_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_57bfaa96-4d21-4031-8b95-3dc73f5a56a6" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_AcquisitionAmortizationExpenseIncludedInProFormaNetIncome_311ae2cc-8535-41e2-837d-7a6f019e174b" xlink:href="jkhy-20221231.xsd#jkhy_AcquisitionAmortizationExpenseIncludedInProFormaNetIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_jkhy_AcquisitionAmortizationExpenseIncludedInProFormaNetIncome_311ae2cc-8535-41e2-837d-7a6f019e174b" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_54d576e5-e1f7-49f2-b967-3214dca49ef1" 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_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_54d576e5-e1f7-49f2-b967-3214dca49ef1" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_b3efa2e1-6cc9-4432-87b2-f8f0fb01911c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_b3efa2e1-6cc9-4432-87b2-f8f0fb01911c" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_f90da1a5-7674-43a4-b45e-008d0e876426" 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_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_NetIncomeLoss_f90da1a5-7674-43a4-b45e-008d0e876426" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_1084e6e4-2548-4140-9e9d-646b4b7b3f93" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_1084e6e4-2548-4140-9e9d-646b4b7b3f93" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ca4d55b4-6926-48c3-b563-d6c7645353be" 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_769b6969-3ecb-428f-adb4-308eec18506b" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ca4d55b4-6926-48c3-b563-d6c7645353be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_5eef4aae-a5f2-4646-bbab-c0914eb78156" 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_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ca4d55b4-6926-48c3-b563-d6c7645353be" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_5eef4aae-a5f2-4646-bbab-c0914eb78156" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5eef4aae-a5f2-4646-bbab-c0914eb78156_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_5eef4aae-a5f2-4646-bbab-c0914eb78156" xlink:to="loc_us-gaap_SegmentDomain_5eef4aae-a5f2-4646-bbab-c0914eb78156_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_5d88ad50-18fd-4a06-9d44-9efce121d0de" 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_5eef4aae-a5f2-4646-bbab-c0914eb78156" xlink:to="loc_us-gaap_SegmentDomain_5d88ad50-18fd-4a06-9d44-9efce121d0de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PaymentsMember_b02d260e-2e42-4de7-83cc-8fde412696db" xlink:href="jkhy-20221231.xsd#jkhy_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_5d88ad50-18fd-4a06-9d44-9efce121d0de" xlink:to="loc_jkhy_PaymentsMember_b02d260e-2e42-4de7-83cc-8fde412696db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_797e2872-2b43-41f4-bd3b-c984209ac8d8" 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_ScheduleOfBusinessAcquisitionsByAcquisitionTable_ca4d55b4-6926-48c3-b563-d6c7645353be" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_797e2872-2b43-41f4-bd3b-c984209ac8d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_797e2872-2b43-41f4-bd3b-c984209ac8d8_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_797e2872-2b43-41f4-bd3b-c984209ac8d8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_797e2872-2b43-41f4-bd3b-c984209ac8d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e88a9b40-c164-47aa-ab45-b89059348221" 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_797e2872-2b43-41f4-bd3b-c984209ac8d8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_e88a9b40-c164-47aa-ab45-b89059348221" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_cc834baa-8cf8-4048-bc56-661869302aeb" 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_e88a9b40-c164-47aa-ab45-b89059348221" xlink:to="loc_us-gaap_CustomerRelationshipsMember_cc834baa-8cf8-4048-bc56-661869302aeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_0e86d863-0496-4dd3-82b6-7b8b94930428" 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_e88a9b40-c164-47aa-ab45-b89059348221" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_0e86d863-0496-4dd3-82b6-7b8b94930428" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_16062f15-4ae4-4115-af6a-2f930b4bcd20" 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_e88a9b40-c164-47aa-ab45-b89059348221" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_16062f15-4ae4-4115-af6a-2f930b4bcd20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4e52f4a2-80fe-44ff-ae6c-2ef08c658b5f" 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_ca4d55b4-6926-48c3-b563-d6c7645353be" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4e52f4a2-80fe-44ff-ae6c-2ef08c658b5f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4e52f4a2-80fe-44ff-ae6c-2ef08c658b5f_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_4e52f4a2-80fe-44ff-ae6c-2ef08c658b5f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4e52f4a2-80fe-44ff-ae6c-2ef08c658b5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_796b4378-93b1-42bc-a71f-6b472c0fa4d5" 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_4e52f4a2-80fe-44ff-ae6c-2ef08c658b5f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_796b4378-93b1-42bc-a71f-6b472c0fa4d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PayrailzMember_ce128ed1-6ab4-42df-a669-56a05acc64bd" xlink:href="jkhy-20221231.xsd#jkhy_PayrailzMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_796b4378-93b1-42bc-a71f-6b472c0fa4d5" xlink:to="loc_jkhy_PayrailzMember_ce128ed1-6ab4-42df-a669-56a05acc64bd" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/ReportableSegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#ReportableSegmentInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/ReportableSegmentInformationNarrativeDetails" xlink:type="extended" id="i4359d67c707748c5a9b92ee1207cf419_ReportableSegmentInformationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_3fda2b15-93ed-41e0-a424-f4bec7d17914" 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_ReclassificationOfRevenueFromComplementaryToPayments_fcf5c8e3-317f-4377-9cd2-919bbb0eec1c" xlink:href="jkhy-20221231.xsd#jkhy_ReclassificationOfRevenueFromComplementaryToPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_3fda2b15-93ed-41e0-a424-f4bec7d17914" xlink:to="loc_jkhy_ReclassificationOfRevenueFromComplementaryToPayments_fcf5c8e3-317f-4377-9cd2-919bbb0eec1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ReclassificationOfRevenueFromComplementaryToCorporateAndOther_191701eb-74cf-4144-9a2b-7e11cb12ae47" xlink:href="jkhy-20221231.xsd#jkhy_ReclassificationOfRevenueFromComplementaryToCorporateAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_3fda2b15-93ed-41e0-a424-f4bec7d17914" xlink:to="loc_jkhy_ReclassificationOfRevenueFromComplementaryToCorporateAndOther_191701eb-74cf-4144-9a2b-7e11cb12ae47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ReclassificationOfCostFromComplementaryToPayments_04fb6adc-f298-4dc2-8e1e-fa5fb36ba5db" xlink:href="jkhy-20221231.xsd#jkhy_ReclassificationOfCostFromComplementaryToPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_3fda2b15-93ed-41e0-a424-f4bec7d17914" xlink:to="loc_jkhy_ReclassificationOfCostFromComplementaryToPayments_04fb6adc-f298-4dc2-8e1e-fa5fb36ba5db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ReclassificationOfCostFromComplementaryToCorporateAndOther_7680f886-c4c3-427e-a6d9-50e3e2844671" xlink:href="jkhy-20221231.xsd#jkhy_ReclassificationOfCostFromComplementaryToCorporateAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_3fda2b15-93ed-41e0-a424-f4bec7d17914" xlink:to="loc_jkhy_ReclassificationOfCostFromComplementaryToCorporateAndOther_7680f886-c4c3-427e-a6d9-50e3e2844671" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_36e7c4db-f4b5-4519-83b1-682ecb61c4bc" 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_3fda2b15-93ed-41e0-a424-f4bec7d17914" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_36e7c4db-f4b5-4519-83b1-682ecb61c4bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_826dcc4d-3db4-4442-b28e-f3c5cad0fa78" 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_36e7c4db-f4b5-4519-83b1-682ecb61c4bc" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_826dcc4d-3db4-4442-b28e-f3c5cad0fa78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_826dcc4d-3db4-4442-b28e-f3c5cad0fa78_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_826dcc4d-3db4-4442-b28e-f3c5cad0fa78" xlink:to="loc_us-gaap_SegmentDomain_826dcc4d-3db4-4442-b28e-f3c5cad0fa78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b95c3289-bc50-464a-bfbd-559eff917dcc" 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_826dcc4d-3db4-4442-b28e-f3c5cad0fa78" xlink:to="loc_us-gaap_SegmentDomain_b95c3289-bc50-464a-bfbd-559eff917dcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CoreSegmentMember_0cd9addd-86ba-4d14-b8d0-b48aa134ea65" xlink:href="jkhy-20221231.xsd#jkhy_CoreSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b95c3289-bc50-464a-bfbd-559eff917dcc" xlink:to="loc_jkhy_CoreSegmentMember_0cd9addd-86ba-4d14-b8d0-b48aa134ea65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PaymentsMember_96c7de5b-9867-431b-b1a9-486d93f87417" xlink:href="jkhy-20221231.xsd#jkhy_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b95c3289-bc50-464a-bfbd-559eff917dcc" xlink:to="loc_jkhy_PaymentsMember_96c7de5b-9867-431b-b1a9-486d93f87417" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ComplementaryMember_e987c3db-9820-4e91-a9aa-b72991c8b3e6" xlink:href="jkhy-20221231.xsd#jkhy_ComplementaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b95c3289-bc50-464a-bfbd-559eff917dcc" xlink:to="loc_jkhy_ComplementaryMember_e987c3db-9820-4e91-a9aa-b72991c8b3e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_d2f7642a-0ce3-439a-a186-0f77f4507e1d" 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_b95c3289-bc50-464a-bfbd-559eff917dcc" xlink:to="loc_us-gaap_CorporateAndOtherMember_d2f7642a-0ce3-439a-a186-0f77f4507e1d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.jackhenry.com/role/ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails" xlink:type="simple" xlink:href="jkhy-20221231.xsd#ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails"/>
  <link:definitionLink xlink:role="http://www.jackhenry.com/role/ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails" xlink:type="extended" id="i3e343cfc5d9f40559d58d770e582719f_ReportableSegmentInformationReconciliationofOperatingProfitbySegmenttoConsolidatedDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_e6692c19-ccfa-4814-9742-ea98e6fbcb11" 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_99f36d94-4cbf-4524-a798-b2b3fb137a70" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_99f36d94-4cbf-4524-a798-b2b3fb137a70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_d44648ea-8914-4feb-a587-9cbfe3d836d6" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_CostOfRevenue_d44648ea-8914-4feb-a587-9cbfe3d836d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_097a05ef-aadf-440a-8a32-39f4adc2e52d" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_097a05ef-aadf-440a-8a32-39f4adc2e52d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_70402880-513d-4976-a3a4-f79445a5e6b5" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_70402880-513d-4976-a3a4-f79445a5e6b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_63b9f3cd-2d10-497d-84d9-0f9e9b501821" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_CostsAndExpenses_63b9f3cd-2d10-497d-84d9-0f9e9b501821" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_2cc44c10-3cc2-481c-8fa6-d2b7ff624df4" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_GrossProfit_2cc44c10-3cc2-481c-8fa6-d2b7ff624df4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_44e01f8a-7ced-473a-8361-a34c53f0f4c1" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_OperatingIncomeLoss_44e01f8a-7ced-473a-8361-a34c53f0f4c1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_bcf0bf2c-3b7a-403d-bd1a-e6ed1c5fa8be" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_bcf0bf2c-3b7a-403d-bd1a-e6ed1c5fa8be" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d2f8692c-505f-4f4d-b84a-54697bb2ba9f" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d2f8692c-505f-4f4d-b84a-54697bb2ba9f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_91bad3bf-0c96-46d5-b325-92bfda1a4b05" 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_e6692c19-ccfa-4814-9742-ea98e6fbcb11" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_91bad3bf-0c96-46d5-b325-92bfda1a4b05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_6227d7e9-9fc7-4551-9048-069707340487" 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_91bad3bf-0c96-46d5-b325-92bfda1a4b05" xlink:to="loc_srt_ProductOrServiceAxis_6227d7e9-9fc7-4551-9048-069707340487" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6227d7e9-9fc7-4551-9048-069707340487_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_6227d7e9-9fc7-4551-9048-069707340487" xlink:to="loc_srt_ProductsAndServicesDomain_6227d7e9-9fc7-4551-9048-069707340487_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_24c49efb-abc5-4957-b42d-4a5100649bde" 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_6227d7e9-9fc7-4551-9048-069707340487" xlink:to="loc_srt_ProductsAndServicesDomain_24c49efb-abc5-4957-b42d-4a5100649bde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndServiceMember_d83a0e6f-4d6c-4589-9b9c-a38b3e69bbe8" 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_24c49efb-abc5-4957-b42d-4a5100649bde" xlink:to="loc_us-gaap_LicenseAndServiceMember_d83a0e6f-4d6c-4589-9b9c-a38b3e69bbe8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ProcessingMember_0391427b-f5cc-4b72-b57e-4a1fb7946a15" xlink:href="jkhy-20221231.xsd#jkhy_ProcessingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_24c49efb-abc5-4957-b42d-4a5100649bde" xlink:to="loc_jkhy_ProcessingMember_0391427b-f5cc-4b72-b57e-4a1fb7946a15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_f756e1c8-34d9-4cdc-ae7f-dd38cd9c0b04" 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_91bad3bf-0c96-46d5-b325-92bfda1a4b05" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_f756e1c8-34d9-4cdc-ae7f-dd38cd9c0b04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f756e1c8-34d9-4cdc-ae7f-dd38cd9c0b04_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_f756e1c8-34d9-4cdc-ae7f-dd38cd9c0b04" xlink:to="loc_us-gaap_SegmentDomain_f756e1c8-34d9-4cdc-ae7f-dd38cd9c0b04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_24ef44f9-d465-4d5e-99d9-6b9dd27d24fa" 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_f756e1c8-34d9-4cdc-ae7f-dd38cd9c0b04" xlink:to="loc_us-gaap_SegmentDomain_24ef44f9-d465-4d5e-99d9-6b9dd27d24fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_CoreSegmentMember_ab6078bc-141e-4a61-9745-6b861c408e94" xlink:href="jkhy-20221231.xsd#jkhy_CoreSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_24ef44f9-d465-4d5e-99d9-6b9dd27d24fa" xlink:to="loc_jkhy_CoreSegmentMember_ab6078bc-141e-4a61-9745-6b861c408e94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_PaymentsMember_385bf3b0-e1ff-4144-8c5a-ae2d087506da" xlink:href="jkhy-20221231.xsd#jkhy_PaymentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_24ef44f9-d465-4d5e-99d9-6b9dd27d24fa" xlink:to="loc_jkhy_PaymentsMember_385bf3b0-e1ff-4144-8c5a-ae2d087506da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_jkhy_ComplementaryMember_ce4171db-e037-41c1-a9f3-b0607efb1dd4" xlink:href="jkhy-20221231.xsd#jkhy_ComplementaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_24ef44f9-d465-4d5e-99d9-6b9dd27d24fa" xlink:to="loc_jkhy_ComplementaryMember_ce4171db-e037-41c1-a9f3-b0607efb1dd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateAndOtherMember_acdf2e94-7c6b-4ef0-abf7-81a6b81e21fa" 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_24ef44f9-d465-4d5e-99d9-6b9dd27d24fa" xlink:to="loc_us-gaap_CorporateAndOtherMember_acdf2e94-7c6b-4ef0-abf7-81a6b81e21fa" xlink:type="arc" order="3"/>
  </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="1"/>
    <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="2"/>
    <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="1"/>
    <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="2"/>
  </link:definitionLink>
</link:linkbase>
