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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e4ba9-69a4-7d4c-82df-0e87ef0b6135,g:bb23dc32-b0f1-4159-b612-d36440abe894-->
<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://parkerhannifin.com/role/ConsolidatedStatementsofEquity" xlink:type="simple" xlink:href="ph-20260630.xsd#ConsolidatedStatementsofEquity"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/ConsolidatedStatementsofEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e4ba9-6c9f-7561-af80-3b9e3c31f15c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e4ba9-6c9f-744f-a15b-365abdb9706b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e4ba9-6c9f-7561-af80-3b9e3c31f15c" xlink:to="loc_us-gaap_StatementTable_019e4ba9-6c9f-744f-a15b-365abdb9706b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6c9f-7ab5-8dee-ec72b2bb7a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e4ba9-6c9f-744f-a15b-365abdb9706b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6c9f-7ab5-8dee-ec72b2bb7a4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-7ab5-8dee-ec72b2bb7a4e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6c9f-7ab5-8dee-ec72b2bb7a4e" xlink:to="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-7ab5-8dee-ec72b2bb7a4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6c9f-7ab5-8dee-ec72b2bb7a4e" xlink:to="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019e4ba9-6c9f-7920-9745-d7a8f55a238d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:to="loc_us-gaap_CommonStockMember_019e4ba9-6c9f-7920-9745-d7a8f55a238d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019e4ba9-6c9f-7038-ba3a-434275cf3cd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019e4ba9-6c9f-7038-ba3a-434275cf3cd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e4ba9-6c9f-7644-a5bf-558ecd09c3c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:to="loc_us-gaap_RetainedEarningsMember_019e4ba9-6c9f-7644-a5bf-558ecd09c3c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4ba9-6c9f-78fa-afd7-ccd1687177bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4ba9-6c9f-78fa-afd7-ccd1687177bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e4ba9-6c9f-7d32-a37b-aba4b7870429" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e4ba9-6c9f-7d32-a37b-aba4b7870429" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019e4ba9-6c9f-7a32-8eaa-a800cbc3b80d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6c9f-70e0-a405-4b2a12810b9e" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019e4ba9-6c9f-7a32-8eaa-a800cbc3b80d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_019f8e8e-f9bf-79f5-a83d-0914b6bf888d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e4ba9-6c9f-744f-a15b-365abdb9706b" xlink:to="loc_srt_RestatementAxis_019f8e8e-f9bf-79f5-a83d-0914b6bf888d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019f8e8e-f9bf-79f5-a83d-0914b6bf888d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_019f8e8e-f9bf-79f5-a83d-0914b6bf888d" xlink:to="loc_srt_RestatementDomain_019f8e8e-f9bf-79f5-a83d-0914b6bf888d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019f8e8e-f9bf-7a09-8c3b-3001737df543" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_019f8e8e-f9bf-79f5-a83d-0914b6bf888d" xlink:to="loc_srt_RestatementDomain_019f8e8e-f9bf-7a09-8c3b-3001737df543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodReclassificationAdjustmentMember_019f8e8f-29f1-7be0-a671-192460dac7ee" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RevisionOfPriorPeriodReclassificationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_019f8e8e-f9bf-7a09-8c3b-3001737df543" xlink:to="loc_srt_RevisionOfPriorPeriodReclassificationAdjustmentMember_019f8e8f-29f1-7be0-a671-192460dac7ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e4ba9-6c9f-7561-af80-3b9e3c31f15c" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019f1911-1d1d-7820-9d53-0830e075752e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019f1911-1d1d-7820-9d53-0830e075752e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4ba9-6c9f-7bcd-9e61-58bf5d5d7f60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4ba9-6c9f-7bcd-9e61-58bf5d5d7f60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019e4ba9-6c9f-79c3-a43b-af6ef1404f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_ProfitLoss_019e4ba9-6c9f-79c3-a43b-af6ef1404f8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e4ba9-6c9f-7f64-a22c-7ff6158372b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e4ba9-6c9f-7f64-a22c-7ff6158372b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCash_019e4ba9-6c9f-7f3c-85ba-d1aad9261539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_DividendsCash_019e4ba9-6c9f-7f3c-85ba-d1aad9261539" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019f190f-a142-7ff5-8fe5-68c06e4fc314" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_019f190f-a142-7ff5-8fe5-68c06e4fc314" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e4ba9-6c9f-7cba-8956-4239017b7606" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e4ba9-6c9f-7cba-8956-4239017b7606" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_019e4ba9-6c9f-7044-bd97-1c65e75da313" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_us-gaap_StockholdersEquityOther_019e4ba9-6c9f-7044-bd97-1c65e75da313" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_TreasuryStockSharesAcquiredCostMethodIncludingExciseTax_019f194d-3fda-71cc-825a-9f4418eae7ea" xlink:href="ph-20260630.xsd#ph_TreasuryStockSharesAcquiredCostMethodIncludingExciseTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_ph_TreasuryStockSharesAcquiredCostMethodIncludingExciseTax_019f194d-3fda-71cc-825a-9f4418eae7ea" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_TreasuryStockValueAcquiredCostMethodIncludingExciseTax_019e4ba9-6c9f-7a49-8104-246ed2a3c03a" xlink:href="ph-20260630.xsd#ph_TreasuryStockValueAcquiredCostMethodIncludingExciseTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4ba9-6c9f-744f-9eda-49665632b4c2" xlink:to="loc_ph_TreasuryStockValueAcquiredCostMethodIncludingExciseTax_019e4ba9-6c9f-7a49-8104-246ed2a3c03a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019f194b-85c6-70cb-8bbd-730f4dc7bc8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4ba9-6c9f-7c4f-9a9d-e684069e813c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/ConsolidatedStatementsofEquityParenthetical" xlink:type="simple" xlink:href="ph-20260630.xsd#ConsolidatedStatementsofEquityParenthetical"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/ConsolidatedStatementsofEquityParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019fc788-680b-7203-ac9e-6b6cd4e35d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019fc788-680b-7cde-86c7-5a1636f2df9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019fc788-680b-7203-ac9e-6b6cd4e35d2a" xlink:to="loc_us-gaap_StatementTable_019fc788-680b-7cde-86c7-5a1636f2df9c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_019fc788-680b-7359-bd9d-3e14508445e0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019fc788-680b-7cde-86c7-5a1636f2df9c" xlink:to="loc_srt_RestatementAxis_019fc788-680b-7359-bd9d-3e14508445e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019fc788-680b-7359-bd9d-3e14508445e0_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_019fc788-680b-7359-bd9d-3e14508445e0" xlink:to="loc_srt_RestatementDomain_019fc788-680b-7359-bd9d-3e14508445e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019fc788-680b-70dd-907e-546b17cf4cda" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_019fc788-680b-7359-bd9d-3e14508445e0" xlink:to="loc_srt_RestatementDomain_019fc788-680b-70dd-907e-546b17cf4cda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RevisionOfPriorPeriodReclassificationAdjustmentMember_019fc788-680b-7f1b-b77f-d5eb2b83841c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RevisionOfPriorPeriodReclassificationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_019fc788-680b-70dd-907e-546b17cf4cda" xlink:to="loc_srt_RevisionOfPriorPeriodReclassificationAdjustmentMember_019fc788-680b-7f1b-b77f-d5eb2b83841c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019fc788-680b-7daf-a7f2-5b81b0aed89d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019fc788-680b-7cde-86c7-5a1636f2df9c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019fc788-680b-7daf-a7f2-5b81b0aed89d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fc788-680b-7daf-a7f2-5b81b0aed89d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019fc788-680b-7daf-a7f2-5b81b0aed89d" xlink:to="loc_us-gaap_EquityComponentDomain_019fc788-680b-7daf-a7f2-5b81b0aed89d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019fc788-680b-75fd-b792-3904b27c3766" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019fc788-680b-7daf-a7f2-5b81b0aed89d" xlink:to="loc_us-gaap_EquityComponentDomain_019fc788-680b-75fd-b792-3904b27c3766" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019fc788-680b-7764-b539-d32c412b99a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019fc788-680b-75fd-b792-3904b27c3766" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019fc788-680b-7764-b539-d32c412b99a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019fc788-680b-70c1-81f3-1a3111c81e47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019fc788-680b-75fd-b792-3904b27c3766" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019fc788-680b-70c1-81f3-1a3111c81e47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e4ba9-6c9f-77dd-8a0a-f5425fab0d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fc788-680b-7203-ac9e-6b6cd4e35d2a" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019e4ba9-6c9f-77dd-8a0a-f5425fab0d3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019fc788-680b-701e-b699-4bfb0c9592f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019fc788-680b-7203-ac9e-6b6cd4e35d2a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019fc788-680b-701e-b699-4bfb0c9592f3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/SignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#SignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/SignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e4ba9-6c9f-7eb9-866f-db4ad30d8f10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e4ba9-6c9f-7dd8-803a-4e12c49bb712" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e4ba9-6c9f-7eb9-866f-db4ad30d8f10" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e4ba9-6c9f-7dd8-803a-4e12c49bb712" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e4ba9-6c9f-7359-b4ab-2f10197cbf74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e4ba9-6c9f-7dd8-803a-4e12c49bb712" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e4ba9-6c9f-7359-b4ab-2f10197cbf74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-7359-b4ab-2f10197cbf74_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e4ba9-6c9f-7359-b4ab-2f10197cbf74" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-7359-b4ab-2f10197cbf74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-72c8-ae33-f6e2402e99b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e4ba9-6c9f-7359-b4ab-2f10197cbf74" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-72c8-ae33-f6e2402e99b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_019e4ba9-6c9f-73f5-95f4-f5b99a975aaa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-72c8-ae33-f6e2402e99b9" xlink:to="loc_us-gaap_BuildingMember_019e4ba9-6c9f-73f5-95f4-f5b99a975aaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_LandImprovementsAndBuildingEquipmentMember_019e4ba9-6c9f-7812-8b28-9897b86e82e6" xlink:href="ph-20260630.xsd#ph_LandImprovementsAndBuildingEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-72c8-ae33-f6e2402e99b9" xlink:to="loc_ph_LandImprovementsAndBuildingEquipmentMember_019e4ba9-6c9f-7812-8b28-9897b86e82e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_019e4ba9-6c9f-7548-90ef-2e80711bf658" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-72c8-ae33-f6e2402e99b9" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_019e4ba9-6c9f-7548-90ef-2e80711bf658" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_VehiclesAndOfficeEquipmentMember_019e4ba9-6c9f-7f9c-bcf2-170efad56f6d" xlink:href="ph-20260630.xsd#ph_VehiclesAndOfficeEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e4ba9-6c9f-72c8-ae33-f6e2402e99b9" xlink:to="loc_ph_VehiclesAndOfficeEquipmentMember_019e4ba9-6c9f-7f9c-bcf2-170efad56f6d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e4ba9-6c9f-7f76-938c-297e97402b46" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e4ba9-6c9f-7dd8-803a-4e12c49bb712" xlink:to="loc_srt_RangeAxis_019e4ba9-6c9f-7f76-938c-297e97402b46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6c9f-7f76-938c-297e97402b46_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e4ba9-6c9f-7f76-938c-297e97402b46" xlink:to="loc_srt_RangeMember_019e4ba9-6c9f-7f76-938c-297e97402b46_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6c9f-7839-bd6e-74f10dafecf0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e4ba9-6c9f-7f76-938c-297e97402b46" xlink:to="loc_srt_RangeMember_019e4ba9-6c9f-7839-bd6e-74f10dafecf0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e4ba9-6c9f-7271-8e25-956a80d121b0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6c9f-7839-bd6e-74f10dafecf0" xlink:to="loc_srt_MinimumMember_019e4ba9-6c9f-7271-8e25-956a80d121b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e4ba9-6c9f-7ee2-9efe-751e9849d6f5" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6c9f-7839-bd6e-74f10dafecf0" xlink:to="loc_srt_MaximumMember_019e4ba9-6c9f-7ee2-9efe-751e9849d6f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e4ba9-6c9f-7e68-aec0-4ce7f420f9bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e4ba9-6c9f-7eb9-866f-db4ad30d8f10" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019e4ba9-6c9f-7e68-aec0-4ce7f420f9bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e4ba9-6c9f-7a5e-bd90-4904897b22ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e4ba9-6c9f-7eb9-866f-db4ad30d8f10" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e4ba9-6c9f-7a5e-bd90-4904897b22ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019e4ba9-6c9f-76d5-a2fd-6a66e6deffef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e4ba9-6c9f-7eb9-866f-db4ad30d8f10" xlink:to="loc_us-gaap_EquityMethodInvestments_019e4ba9-6c9f-76d5-a2fd-6a66e6deffef" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RevenueRecognitionScheduleofRevenuesbyTechnologyPlatformDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RevenueRecognitionScheduleofRevenuesbyTechnologyPlatformDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RevenueRecognitionScheduleofRevenuesbyTechnologyPlatformDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-7ef5-9ae2-1a6c0dc491a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ecc-82c1-768df2f03274" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-7ef5-9ae2-1a6c0dc491a7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ecc-82c1-768df2f03274" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7bdd-b100-e33b055c05e1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ecc-82c1-768df2f03274" xlink:to="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7bdd-b100-e33b055c05e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7bdd-b100-e33b055c05e1_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7bdd-b100-e33b055c05e1" xlink:to="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7bdd-b100-e33b055c05e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-719b-a178-e1d5d6909e98" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7bdd-b100-e33b055c05e1" xlink:to="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-719b-a178-e1d5d6909e98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_MotionSystemsMember_019e4ba9-6c9f-7efc-8a48-6a53fa77e04e" xlink:href="ph-20260630.xsd#ph_MotionSystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-719b-a178-e1d5d6909e98" xlink:to="loc_ph_MotionSystemsMember_019e4ba9-6c9f-7efc-8a48-6a53fa77e04e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FlowAndProcessControlMember_019e4ba9-6c9f-7628-afbb-7021ab7bfc5e" xlink:href="ph-20260630.xsd#ph_FlowAndProcessControlMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-719b-a178-e1d5d6909e98" xlink:to="loc_ph_FlowAndProcessControlMember_019e4ba9-6c9f-7628-afbb-7021ab7bfc5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FiltrationAndEngineeredMaterialsMember_019e4ba9-6c9f-7758-8d16-d7178de05814" xlink:href="ph-20260630.xsd#ph_FiltrationAndEngineeredMaterialsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-719b-a178-e1d5d6909e98" xlink:to="loc_ph_FiltrationAndEngineeredMaterialsMember_019e4ba9-6c9f-7758-8d16-d7178de05814" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7afc-b71b-482bedd34d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ecc-82c1-768df2f03274" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7afc-b71b-482bedd34d7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7afc-b71b-482bedd34d7f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7afc-b71b-482bedd34d7f" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7afc-b71b-482bedd34d7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77cf-b7b9-958df491ca69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7afc-b71b-482bedd34d7f" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77cf-b7b9-958df491ca69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6c9f-7b99-b3c9-66a43d3205cf" xlink:href="ph-20260630.xsd#ph_DiversifiedIndustrialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77cf-b7b9-958df491ca69" xlink:to="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6c9f-7b99-b3c9-66a43d3205cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6c9f-7367-9855-284a63ac3434" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-7ef5-9ae2-1a6c0dc491a7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6c9f-7367-9855-284a63ac3434" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RevenueRecognitionScheduleofRevenuesbyMarketSegmentDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RevenueRecognitionScheduleofRevenuesbyMarketSegmentDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RevenueRecognitionScheduleofRevenuesbyMarketSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-7bda-9b04-4c1e1869b5bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7bfa-b065-656636844ebf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-7bda-9b04-4c1e1869b5bd" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7bfa-b065-656636844ebf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7ae0-bf49-ea67ca2c3e76" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7bfa-b065-656636844ebf" xlink:to="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7ae0-bf49-ea67ca2c3e76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7ae0-bf49-ea67ca2c3e76_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7ae0-bf49-ea67ca2c3e76" xlink:to="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7ae0-bf49-ea67ca2c3e76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7be9-aaa1-aa8457928db3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e4ba9-6c9f-7ae0-bf49-ea67ca2c3e76" xlink:to="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7be9-aaa1-aa8457928db3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CommercialOriginalEquipmentManufacturerMember_019e4ba9-6c9f-7232-9d59-707955ec20e4" xlink:href="ph-20260630.xsd#ph_CommercialOriginalEquipmentManufacturerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7be9-aaa1-aa8457928db3" xlink:to="loc_ph_CommercialOriginalEquipmentManufacturerMember_019e4ba9-6c9f-7232-9d59-707955ec20e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CommercialAftermarketMember_019e4ba9-6c9f-7ef6-8e14-02f06280fec6" xlink:href="ph-20260630.xsd#ph_CommercialAftermarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7be9-aaa1-aa8457928db3" xlink:to="loc_ph_CommercialAftermarketMember_019e4ba9-6c9f-7ef6-8e14-02f06280fec6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefenseOriginalEquipmentManufacturerMember_019e4ba9-6c9f-75e5-b3c4-95eb27f3020a" xlink:href="ph-20260630.xsd#ph_DefenseOriginalEquipmentManufacturerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7be9-aaa1-aa8457928db3" xlink:to="loc_ph_DefenseOriginalEquipmentManufacturerMember_019e4ba9-6c9f-75e5-b3c4-95eb27f3020a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefenseAftermarketMember_019e4ba9-6c9f-7696-947b-97e48d1e80ed" xlink:href="ph-20260630.xsd#ph_DefenseAftermarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4ba9-6c9f-7be9-aaa1-aa8457928db3" xlink:to="loc_ph_DefenseAftermarketMember_019e4ba9-6c9f-7696-947b-97e48d1e80ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7aba-8259-aeaf3af6ec92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7bfa-b065-656636844ebf" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7aba-8259-aeaf3af6ec92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7aba-8259-aeaf3af6ec92_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7aba-8259-aeaf3af6ec92" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7aba-8259-aeaf3af6ec92_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7cbb-9ec2-fee6bcf71611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7aba-8259-aeaf3af6ec92" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7cbb-9ec2-fee6bcf71611" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6c9f-7a98-8c89-671dc34cffba" xlink:href="ph-20260630.xsd#ph_AerospaceSystemsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7cbb-9ec2-fee6bcf71611" xlink:to="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6c9f-7a98-8c89-671dc34cffba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6c9f-7e2a-9ce8-f1c98c355db7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-7bda-9b04-4c1e1869b5bd" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6c9f-7e2a-9ce8-f1c98c355db7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RevenueRecognitionScheduleofTotalRevenuebyGeographicRegionDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RevenueRecognitionScheduleofTotalRevenuebyGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RevenueRecognitionScheduleofTotalRevenuebyGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-734a-b2ca-f9647eec3e12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ef2-b264-c1738edb3220" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-734a-b2ca-f9647eec3e12" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ef2-b264-c1738edb3220" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e4ba9-6c9f-7f78-932a-65ed0c6990e7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e4ba9-6c9f-7ef2-b264-c1738edb3220" xlink:to="loc_srt_StatementGeographicalAxis_019e4ba9-6c9f-7f78-932a-65ed0c6990e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7f78-932a-65ed0c6990e7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019e4ba9-6c9f-7f78-932a-65ed0c6990e7" xlink:to="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7f78-932a-65ed0c6990e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7221-ba0c-ab1da60f7109" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019e4ba9-6c9f-7f78-932a-65ed0c6990e7" xlink:to="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7221-ba0c-ab1da60f7109" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NorthAmericaMember_019e4ba9-6c9f-72f0-9642-af912972939f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NorthAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7221-ba0c-ab1da60f7109" xlink:to="loc_srt_NorthAmericaMember_019e4ba9-6c9f-72f0-9642-af912972939f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019fd792-8da5-777f-a97a-92ce46cbcd53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7221-ba0c-ab1da60f7109" xlink:to="loc_us-gaap_EMEAMember_019fd792-8da5-777f-a97a-92ce46cbcd53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019e4ba9-6c9f-724a-b2b1-75a5958dd2f2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7221-ba0c-ab1da60f7109" xlink:to="loc_srt_AsiaPacificMember_019e4ba9-6c9f-724a-b2b1-75a5958dd2f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LatinAmericaMember_019e4ba9-6c9f-79d4-87a8-d31dd5b89471" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LatinAmericaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e4ba9-6c9f-7221-ba0c-ab1da60f7109" xlink:to="loc_srt_LatinAmericaMember_019e4ba9-6c9f-79d4-87a8-d31dd5b89471" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6c9f-7b75-8603-f4622b1247bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4ba9-6c9f-734a-b2ca-f9647eec3e12" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6c9f-7b75-8603-f4622b1247bb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RevenueRecognitionNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RevenueRecognitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e4ba9-6c9f-705a-821b-114d902e162e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e4ba9-6c9f-705a-821b-114d902e162e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e4ba9-6c9f-7420-a15d-5f3e3b247b97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e4ba9-6c9f-705a-821b-114d902e162e" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e4ba9-6c9f-7420-a15d-5f3e3b247b97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e4ba9-6c9f-7a25-acf6-865f612cc366" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e4ba9-6c9f-7a25-acf6-865f612cc366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e4ba9-6c9f-760b-92ea-a56d454669b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e4ba9-6c9f-760b-92ea-a56d454669b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e4ba9-6c9f-7031-bc24-7584c421955a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e4ba9-6c9f-7031-bc24-7584c421955a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e4ba9-6c9f-7a90-bc9a-0c7229bde237" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e4ba9-6c9f-7a90-bc9a-0c7229bde237" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="simple" xlink:href="ph-20260630.xsd#RevenueRecognitionNarrativeDetails_1"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RevenueRecognitionNarrativeDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e4ba9-6c9f-705a-821b-114d902e162e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e4ba9-6c9f-705a-821b-114d902e162e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e4ba9-6c9f-7a25-acf6-865f612cc366" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e4ba9-6c9f-7a25-acf6-865f612cc366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e4ba9-6c9f-760b-92ea-a56d454669b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e4ba9-6c9f-760b-92ea-a56d454669b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e4ba9-6c9f-7031-bc24-7584c421955a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_019e4ba9-6c9f-7031-bc24-7584c421955a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e4ba9-6c9f-7a90-bc9a-0c7229bde237" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e4ba9-6c9f-7d54-ba9a-b56ca209b6e6" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e4ba9-6c9f-7a90-bc9a-0c7229bde237" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/AcquisitionsandDivestituresNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#AcquisitionsandDivestituresNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/AcquisitionsandDivestituresNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e813d-0cab-70f3-a6dd-cdf0d53d340d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e813d-0cab-70f3-a6dd-cdf0d53d340d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-70f3-a6dd-cdf0d53d340d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e813d-0cab-70f3-a6dd-cdf0d53d340d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-70f3-a6dd-cdf0d53d340d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-78b0-812f-6da4dee336e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e813d-0cab-70f3-a6dd-cdf0d53d340d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-78b0-812f-6da4dee336e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CIRCORInternationalIncMember_019e813d-0cab-7c14-b6e4-d1e9ba44284f" xlink:href="ph-20260630.xsd#ph_CIRCORInternationalIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-78b0-812f-6da4dee336e6" xlink:to="loc_ph_CIRCORInternationalIncMember_019e813d-0cab-7c14-b6e4-d1e9ba44284f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FiltrationGroupCorporationMember_019e813d-0cab-70dc-9e12-eb77518019e1" xlink:href="ph-20260630.xsd#ph_FiltrationGroupCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-78b0-812f-6da4dee336e6" xlink:to="loc_ph_FiltrationGroupCorporationMember_019e813d-0cab-70dc-9e12-eb77518019e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CurtisInstrumentsIncMember_019e813d-0cab-789c-96f7-c0e3e3cfb548" xlink:href="ph-20260630.xsd#ph_CurtisInstrumentsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e813d-0cab-78b0-812f-6da4dee336e6" xlink:to="loc_ph_CurtisInstrumentsIncMember_019e813d-0cab-789c-96f7-c0e3e3cfb548" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e813d-381d-78e3-8a28-3d5730840d18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e813d-381d-78e3-8a28-3d5730840d18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-78e3-8a28-3d5730840d18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e813d-381d-78e3-8a28-3d5730840d18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-78e3-8a28-3d5730840d18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-72f4-93e1-c3e8476505ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e813d-381d-78e3-8a28-3d5730840d18" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-72f4-93e1-c3e8476505ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019e813d-381d-79e3-a7fc-bd89a48be50d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-72f4-93e1-c3e8476505ad" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019e813d-381d-79e3-a7fc-bd89a48be50d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_PatentsAndTechnologyMember_019e813d-381d-7f5f-83e3-3d65694e1c33" xlink:href="ph-20260630.xsd#ph_PatentsAndTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-72f4-93e1-c3e8476505ad" xlink:to="loc_ph_PatentsAndTechnologyMember_019e813d-381d-7f5f-83e3-3d65694e1c33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019e813d-381d-7468-ac97-aad4b8675703" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e813d-381d-72f4-93e1-c3e8476505ad" xlink:to="loc_us-gaap_TradeNamesMember_019e813d-381d-7468-ac97-aad4b8675703" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019e813d-6056-74cd-a20e-e4a0b65eff1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019e813d-6056-74cd-a20e-e4a0b65eff1d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019e813d-6056-74cd-a20e-e4a0b65eff1d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019e813d-6056-74cd-a20e-e4a0b65eff1d" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019e813d-6056-74cd-a20e-e4a0b65eff1d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019e813d-6056-7d08-b901-d2b614fbb0f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019e813d-6056-74cd-a20e-e4a0b65eff1d" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019e813d-6056-7d08-b901-d2b614fbb0f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019e813d-6056-70da-90a6-94a8005e2e17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019e813d-6056-7d08-b901-d2b614fbb0f8" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019e813d-6056-70da-90a6-94a8005e2e17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e813d-6056-77c1-81c1-3d6c2eb80266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e813d-6056-77c1-81c1-3d6c2eb80266" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-77c1-81c1-3d6c2eb80266_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e813d-6056-77c1-81c1-3d6c2eb80266" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-77c1-81c1-3d6c2eb80266_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-7a96-a2d9-0dd53d9f3018" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e813d-6056-77c1-81c1-3d6c2eb80266" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-7a96-a2d9-0dd53d9f3018" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CompositesAndFuelContainmentBusinessMember_019e813d-6056-7b4a-8d4e-f261ce79daa5" xlink:href="ph-20260630.xsd#ph_CompositesAndFuelContainmentBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-7a96-a2d9-0dd53d9f3018" xlink:to="loc_ph_CompositesAndFuelContainmentBusinessMember_019e813d-6056-7b4a-8d4e-f261ce79daa5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_NonCoreFiltrationBusinessMember_019e813d-6056-7eff-b2e1-2ce43f19099f" xlink:href="ph-20260630.xsd#ph_NonCoreFiltrationBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-7a96-a2d9-0dd53d9f3018" xlink:to="loc_ph_NonCoreFiltrationBusinessMember_019e813d-6056-7eff-b2e1-2ce43f19099f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FilterResourcesBusinessMember_019e813d-6056-7421-bd19-f188b913fb30" xlink:href="ph-20260630.xsd#ph_FilterResourcesBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-7a96-a2d9-0dd53d9f3018" xlink:to="loc_ph_FilterResourcesBusinessMember_019e813d-6056-7421-bd19-f188b913fb30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_MicroStrainSensingSystemsBusinessMember_019e813d-6057-7c90-8996-b7854895b49a" xlink:href="ph-20260630.xsd#ph_MicroStrainSensingSystemsBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e813d-6056-7a96-a2d9-0dd53d9f3018" xlink:to="loc_ph_MicroStrainSensingSystemsBusinessMember_019e813d-6057-7c90-8996-b7854895b49a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e813d-6057-78b7-a52e-eb31861faf12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7b50-b254-9d8fae8b5974" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e813d-6057-78b7-a52e-eb31861faf12" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e813d-6057-78b7-a52e-eb31861faf12_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e813d-6057-78b7-a52e-eb31861faf12" xlink:to="loc_us-gaap_SegmentDomain_019e813d-6057-78b7-a52e-eb31861faf12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e813d-6057-7196-911a-8551d7425e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e813d-6057-78b7-a52e-eb31861faf12" xlink:to="loc_us-gaap_SegmentDomain_019e813d-6057-7196-911a-8551d7425e7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiversifiedIndustrialSegmentMember_019e813d-6057-7f7c-b729-81816d2d16b3" xlink:href="ph-20260630.xsd#ph_DiversifiedIndustrialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e813d-6057-7196-911a-8551d7425e7b" xlink:to="loc_ph_DiversifiedIndustrialSegmentMember_019e813d-6057-7f7c-b729-81816d2d16b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationPriceOfAcquisitionExpected_019e813d-0cab-705c-bf18-1978fb1a3f40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationPriceOfAcquisitionExpected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_BusinessCombinationPriceOfAcquisitionExpected_019e813d-0cab-705c-bf18-1978fb1a3f40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_01a0101c-100b-7ee2-982f-eaf4e1ebc39f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_01a0101c-100b-7ee2-982f-eaf4e1ebc39f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e813d-381d-7496-a598-9f77610f71f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e813d-381d-7496-a598-9f77610f71f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019e813d-381d-774c-a15d-9e04ba632b77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019e813d-381d-774c-a15d-9e04ba632b77" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019e813d-381d-7d16-bbd0-5cc1d2c868ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019e813d-381d-7d16-bbd0-5cc1d2c868ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e813d-381d-7899-8322-6c2bb990be8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e813d-381d-7899-8322-6c2bb990be8f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_019e813d-381d-7634-8504-1312510e6cae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_AdjustmentForAmortization_019e813d-381d-7634-8504-1312510e6cae" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019e813d-6057-7ee2-bfe8-7f98d46bae6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019e813d-6057-7ee2-bfe8-7f98d46bae6a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_019e813d-6057-72cd-a13f-aeb9c39430ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_019e813d-6057-72cd-a13f-aeb9c39430ca" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalStatementOfIncomeExtensibleList_019f8ea7-1ba2-7f44-b915-fac47b69fd70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-77bc-aef7-ee26525a68cd" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposalStatementOfIncomeExtensibleList_019f8ea7-1ba2-7f44-b915-fac47b69fd70" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/AcquisitionsandDivestituresScheduleofPreliminaryEstimatedFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#AcquisitionsandDivestituresScheduleofPreliminaryEstimatedFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/AcquisitionsandDivestituresScheduleofPreliminaryEstimatedFairValuesofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7971-984f-d7707117e5d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7971-984f-d7707117e5d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_019e8122-9b13-7e47-b895-ca4b552607a6" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7971-984f-d7707117e5d7" xlink:to="loc_srt_RestatementAxis_019e8122-9b13-7e47-b895-ca4b552607a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019e8122-9b13-7e47-b895-ca4b552607a6_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_019e8122-9b13-7e47-b895-ca4b552607a6" xlink:to="loc_srt_RestatementDomain_019e8122-9b13-7e47-b895-ca4b552607a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_019e8122-9b13-7c4e-a7fa-b1f8fbd230ff" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_019e8122-9b13-7e47-b895-ca4b552607a6" xlink:to="loc_srt_RestatementDomain_019e8122-9b13-7c4e-a7fa-b1f8fbd230ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_019e8122-9b13-7bd9-93f0-76bada8f7d7e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_019e8122-9b13-7c4e-a7fa-b1f8fbd230ff" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_019e8122-9b13-7bd9-93f0-76bada8f7d7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e8122-9b13-72d0-8311-ca07c09f111e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4ba9-6c9f-7971-984f-d7707117e5d7" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e8122-9b13-72d0-8311-ca07c09f111e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e8122-9b13-72d0-8311-ca07c09f111e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e8122-9b13-72d0-8311-ca07c09f111e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e8122-9b13-72d0-8311-ca07c09f111e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e8122-9b13-762e-bf67-5a412cc7feaa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e8122-9b13-72d0-8311-ca07c09f111e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e8122-9b13-762e-bf67-5a412cc7feaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CurtisInstrumentsIncMember_019e8122-9b13-7b11-b4e9-dff632bbfcf0" xlink:href="ph-20260630.xsd#ph_CurtisInstrumentsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e8122-9b13-762e-bf67-5a412cc7feaa" xlink:to="loc_ph_CurtisInstrumentsIncMember_019e8122-9b13-7b11-b4e9-dff632bbfcf0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019e8122-9b13-724e-9b89-112aa84529d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_019e8122-9b13-724e-9b89-112aa84529d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashAndCashEquivalents_019e8122-9b13-7d1d-9b6e-636a8c7a739b" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashAndCashEquivalents_019e8122-9b13-7d1d-9b6e-636a8c7a739b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019e8122-9b13-74bd-8922-f4c3c9309227" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_019e8122-9b13-74bd-8922-f4c3c9309227" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentReceivableCurrent_019e8122-9b13-79fe-93f1-bc29192fbb5f" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentReceivableCurrent_019e8122-9b13-79fe-93f1-bc29192fbb5f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019e8122-9b13-78d7-ad60-d1c99486afed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_019e8122-9b13-78d7-ad60-d1c99486afed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory_019e8122-9b13-7156-a283-215321d1b224" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventory_019e8122-9b13-7156-a283-215321d1b224" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationRecognizedAssetAcquiredPrepaidExpenseCurrent_019e8122-9b13-7633-b36f-b9797b87ae1d" xlink:href="ph-20260630.xsd#ph_BusinessCombinationRecognizedAssetAcquiredPrepaidExpenseCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationRecognizedAssetAcquiredPrepaidExpenseCurrent_019e8122-9b13-7633-b36f-b9797b87ae1d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPrepaidExpenseCurrent_019e8122-9b13-7f6c-b374-02f3f76cfb45" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPrepaidExpenseCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPrepaidExpenseCurrent_019e8122-9b13-7f6c-b374-02f3f76cfb45" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e8122-9b13-7976-8b96-0ca29b2b4260" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e8122-9b13-7976-8b96-0ca29b2b4260" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles_019e8122-9b13-7525-b51e-d6d2187bcafd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles_019e8122-9b13-7525-b51e-d6d2187bcafd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019e8122-9b13-7263-9287-d85fe3344e64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019e8122-9b13-7263-9287-d85fe3344e64" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment_019e8122-9b13-782c-b972-d561c6c4f8fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment_019e8122-9b13-782c-b972-d561c6c4f8fa" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019e8122-9b13-7573-acfc-c0fb09e84fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019e8122-9b13-7573-acfc-c0fb09e84fd9" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetNoncurrent_019e8122-9b13-7403-86d0-e91eba727e85" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherAssetNoncurrent_019e8122-9b13-7403-86d0-e91eba727e85" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019e8122-9b13-7198-b843-f85b99e5d90b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_019e8122-9b13-7198-b843-f85b99e5d90b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayableCurrent_019e8122-9b13-783a-9746-5439de28277d" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccountsPayableCurrent_019e8122-9b13-783a-9746-5439de28277d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019e8122-9b13-7ea7-b00d-c68a8e1f4c82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_019e8122-9b13-7ea7-b00d-c68a8e1f4c82" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityCurrent_019e8122-9b13-75fe-9750-27385c55a1f4" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityCurrent_019e8122-9b13-75fe-9750-27385c55a1f4" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019e8122-9b13-7de7-be4d-c44cada66fed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019e8122-9b13-7de7-be4d-c44cada66fed" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiability_019e8122-9b13-7e45-963a-fcc35f51482e" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredTaxLiability_019e8122-9b13-7e45-963a-fcc35f51482e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019e8122-9b13-77d9-96aa-14e5b88a06a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_019e8122-9b13-77d9-96aa-14e5b88a06a1" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityNoncurrent_019e8122-9b13-7a2d-8d88-a2e094b21548" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherLiabilityNoncurrent_019e8122-9b13-7a2d-8d88-a2e094b21548" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019e8122-9b13-777c-a41f-3f61b68db21f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_019e8122-9b13-777c-a41f-3f61b68db21f" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred_019e8122-9b13-7f6c-b2f7-f84fe679412e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred_019e8122-9b13-7f6c-b2f7-f84fe679412e" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e8122-9b13-7d15-b625-1365818cb0be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_Goodwill_019e8122-9b13-7d15-b625-1365818cb0be" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019e8122-9b13-71f6-a33c-8abc1a3d85ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_019e8122-9b13-71f6-a33c-8abc1a3d85ed" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019e8122-9b13-7d01-ab8f-af114e01e63a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019e8122-9b13-7d01-ab8f-af114e01e63a" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferredIncludingGoodwill_019e8122-9b13-7716-891a-13127adaacf5" xlink:href="ph-20260630.xsd#ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferredIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4ba9-6c9f-7588-8975-49d8d7d77dae" xlink:to="loc_ph_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferredIncludingGoodwill_019e8122-9b13-7716-891a-13127adaacf5" xlink:type="arc" order="27"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/BusinessRealignmentScheduleofBusinessRealignmentChargesandWorkforceReductionsbyBusinessSegmentDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#BusinessRealignmentScheduleofBusinessRealignmentChargesandWorkforceReductionsbyBusinessSegmentDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/BusinessRealignmentScheduleofBusinessRealignmentChargesandWorkforceReductionsbyBusinessSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7405-81f7-3f160b62a8f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-7ac2-83ef-609fceab4833" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7405-81f7-3f160b62a8f9" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-7ac2-83ef-609fceab4833" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e4ba9-6c9f-7eda-a624-2959cd743d18" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-7ac2-83ef-609fceab4833" xlink:to="loc_srt_ConsolidationItemsAxis_019e4ba9-6c9f-7eda-a624-2959cd743d18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7eda-a624-2959cd743d18_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e4ba9-6c9f-7eda-a624-2959cd743d18" xlink:to="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7eda-a624-2959cd743d18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7f69-ace0-c394f694b722" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e4ba9-6c9f-7eda-a624-2959cd743d18" xlink:to="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7f69-ace0-c394f694b722" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e4ba9-6c9f-7857-89cf-a5c70158e095" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7f69-ace0-c394f694b722" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e4ba9-6c9f-7857-89cf-a5c70158e095" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e4ba9-6c9f-743b-a544-e3f24924057a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7f69-ace0-c394f694b722" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e4ba9-6c9f-743b-a544-e3f24924057a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_019e4ba9-6c9f-7f83-8e59-f1a3c14dc1fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4ba9-6c9f-7f69-ace0-c394f694b722" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_019e4ba9-6c9f-7f83-8e59-f1a3c14dc1fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7d3f-8828-3aafbb11a7db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-7ac2-83ef-609fceab4833" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7d3f-8828-3aafbb11a7db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7d3f-8828-3aafbb11a7db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7d3f-8828-3aafbb11a7db" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-7d3f-8828-3aafbb11a7db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77f7-aafa-b5a606302af6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6c9f-7d3f-8828-3aafbb11a7db" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77f7-aafa-b5a606302af6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6c9f-749e-88b9-f88997a21d02" xlink:href="ph-20260630.xsd#ph_DiversifiedIndustrialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77f7-aafa-b5a606302af6" xlink:to="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6c9f-749e-88b9-f88997a21d02" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6c9f-706b-828b-56d64530d9e8" xlink:href="ph-20260630.xsd#ph_AerospaceSystemsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6c9f-77f7-aafa-b5a606302af6" xlink:to="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6c9f-706b-828b-56d64530d9e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e4ba9-6c9f-7313-9558-7febdc6dd594" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7405-81f7-3f160b62a8f9" xlink:to="loc_us-gaap_RestructuringCharges_019e4ba9-6c9f-7313-9558-7febdc6dd594" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/BusinessRealignmentScheduleofBusinessRealignmentChargesDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#BusinessRealignmentScheduleofBusinessRealignmentChargesDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/BusinessRealignmentScheduleofBusinessRealignmentChargesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-74b9-bbfa-8612a5614b6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-74b9-bbfa-8612a5614b6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e4ba9-6c9f-799b-a79f-ba9defbade7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-74b9-bbfa-8612a5614b6a" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e4ba9-6c9f-799b-a79f-ba9defbade7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e4ba9-6c9f-70af-b8f8-d8eb37906d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:to="loc_us-gaap_RestructuringCharges_019e4ba9-6c9f-70af-b8f8-d8eb37906d5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019e4ba9-6c9f-7d67-94f5-58978a89b443" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:to="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019e4ba9-6c9f-7d67-94f5-58978a89b443" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/BusinessRealignmentScheduleofBusinessRealignmentChargesDetails_1" xlink:type="simple" xlink:href="ph-20260630.xsd#BusinessRealignmentScheduleofBusinessRealignmentChargesDetails_1"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/BusinessRealignmentScheduleofBusinessRealignmentChargesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-74b9-bbfa-8612a5614b6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019e4ba9-6c9f-74b9-bbfa-8612a5614b6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019e4ba9-6c9f-70af-b8f8-d8eb37906d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:to="loc_us-gaap_RestructuringCharges_019e4ba9-6c9f-70af-b8f8-d8eb37906d5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019e4ba9-6c9f-7d67-94f5-58978a89b443" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019e4ba9-6c9f-7745-9422-c5a0c3866b3f" xlink:to="loc_us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019e4ba9-6c9f-7d67-94f5-58978a89b443" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationAllowanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceTable_019fdd41-5806-7f6b-b935-c56d8b1ff15f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationAllowanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_us-gaap_ValuationAllowanceTable_019fdd41-5806-7f6b-b935-c56d8b1ff15f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd41-5806-7f84-a718-90e3ad57a29f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_019fdd41-5806-7f6b-b935-c56d8b1ff15f" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd41-5806-7f84-a718-90e3ad57a29f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_019fdd41-5806-7f84-a718-90e3ad57a29f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd41-5806-7f84-a718-90e3ad57a29f" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_019fdd41-5806-7f84-a718-90e3ad57a29f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_019fdd41-5806-7bb7-af4e-bf51807d029e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd41-5806-7f84-a718-90e3ad57a29f" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_019fdd41-5806-7bb7-af4e-bf51807d029e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_NonOperatingEntitiesWhoseLossCarryforwardUtilizationIsConsideredToBeRemoteMember_019fdd41-5806-72bf-8bc4-fa4101ee13ea" xlink:href="ph-20260630.xsd#ph_NonOperatingEntitiesWhoseLossCarryforwardUtilizationIsConsideredToBeRemoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_019fdd41-5806-7bb7-af4e-bf51807d029e" xlink:to="loc_ph_NonOperatingEntitiesWhoseLossCarryforwardUtilizationIsConsideredToBeRemoteMember_019fdd41-5806-72bf-8bc4-fa4101ee13ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_OtherDeferredTaxAssetsMember_019fdd41-5806-7ee9-ad4d-0d27b23b934d" xlink:href="ph-20260630.xsd#ph_OtherDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_019fdd41-5806-7bb7-af4e-bf51807d029e" xlink:to="loc_ph_OtherDeferredTaxAssetsMember_019fdd41-5806-7ee9-ad4d-0d27b23b934d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_UndistributedForeignEarningsDeemedRepatriated_019ece2f-c254-763e-bfe6-dda008c49c13" xlink:href="ph-20260630.xsd#ph_UndistributedForeignEarningsDeemedRepatriated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_ph_UndistributedForeignEarningsDeemedRepatriated_019ece2f-c254-763e-bfe6-dda008c49c13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxLiabilitiesUndistributedForeignEarningsDeemedRepatriated_019ece2f-c254-7be7-9bd9-88c85a2399ab" xlink:href="ph-20260630.xsd#ph_DeferredTaxLiabilitiesUndistributedForeignEarningsDeemedRepatriated"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_ph_DeferredTaxLiabilitiesUndistributedForeignEarningsDeemedRepatriated_019ece2f-c254-7be7-9bd9-88c85a2399ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_019ece2f-c254-7609-9b2f-5b49f2585135" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UndistributedEarningsOfForeignSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_us-gaap_UndistributedEarningsOfForeignSubsidiaries_019ece2f-c254-7609-9b2f-5b49f2585135" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxLiabilitiesUndistributedForeignEarningsNotPermanentlyReinvestedInSubsidiaries_019ece2f-c254-7eea-a06a-e08733cc1f12" xlink:href="ph-20260630.xsd#ph_DeferredTaxLiabilitiesUndistributedForeignEarningsNotPermanentlyReinvestedInSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_ph_DeferredTaxLiabilitiesUndistributedForeignEarningsNotPermanentlyReinvestedInSubsidiaries_019ece2f-c254-7eea-a06a-e08733cc1f12" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_019fdd41-d068-7f80-8458-3fdc7952eb02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_019fdd41-d068-7f80-8458-3fdc7952eb02" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiscreteIncomeTaxExpenseBenefit_019ece30-2346-7b91-8834-07108bbedbc2" xlink:href="ph-20260630.xsd#ph_DiscreteIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_ph_DiscreteIncomeTaxExpenseBenefit_019ece30-2346-7b91-8834-07108bbedbc2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardsWriteoff_019ece30-2346-713a-b994-96dbc179a670" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardsWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardsWriteoff_019ece30-2346-713a-b994-96dbc179a670" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019ece30-4c04-7dfc-9f9f-0f4511c0374d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_019ece30-4c04-7dfc-9f9f-0f4511c0374d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_019ece30-4c04-7205-ace9-e9f32b0a9c12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued_019ece30-4c04-7205-ace9-e9f32b0a9c12" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued_019ece30-4c04-7e05-a027-aceae294684a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019fdd41-5806-7629-858e-ade3c108fde1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued_019ece30-4c04-7e05-a027-aceae294684a" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/IncomeTaxesScheduleofNetOperatingLossesCapitalLossesTaxCreditsOtherLossCarryforwardsandValuationAllowancesDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#IncomeTaxesScheduleofNetOperatingLossesCapitalLossesTaxCreditsOtherLossCarryforwardsandValuationAllowancesDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/IncomeTaxesScheduleofNetOperatingLossesCapitalLossesTaxCreditsOtherLossCarryforwardsandValuationAllowancesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationAllowanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceTable_019ecc5e-5635-741a-9245-d303f79d48d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationAllowanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_us-gaap_ValuationAllowanceTable_019ecc5e-5635-741a-9245-d303f79d48d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd53-5337-76cb-8eed-1d68696e591a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_019ecc5e-5635-741a-9245-d303f79d48d0" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd53-5337-76cb-8eed-1d68696e591a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_019fdd53-5337-76cb-8eed-1d68696e591a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd53-5337-76cb-8eed-1d68696e591a" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_019fdd53-5337-76cb-8eed-1d68696e591a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_019fdd53-5337-749b-b916-ac3e6052b70c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_019fdd53-5337-76cb-8eed-1d68696e591a" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_019fdd53-5337-749b-b916-ac3e6052b70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_019fdd53-5337-749b-b916-ac3e6052b70c" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_OperatingLossCarryforwardFederalSubjectToExpirationMember_019fdd53-c008-7b44-9db0-01834d032dea" xlink:href="ph-20260630.xsd#ph_OperatingLossCarryforwardFederalSubjectToExpirationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:to="loc_ph_OperatingLossCarryforwardFederalSubjectToExpirationMember_019fdd53-c008-7b44-9db0-01834d032dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardFederalSubjectToExpirationMember_019fdd53-edb3-72c4-bcaf-063c0c3a7960" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsTaxCreditCarryforwardFederalSubjectToExpirationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:to="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardFederalSubjectToExpirationMember_019fdd53-edb3-72c4-bcaf-063c0c3a7960" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardStateSubjectToExpirationMember_019fdd54-3ac4-7099-ba7f-085060394445" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardStateSubjectToExpirationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardStateSubjectToExpirationMember_019fdd54-3ac4-7099-ba7f-085060394445" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardStateNotSubjectToExpirationMember_019fdd54-8a02-7177-8a0e-65b404601ab0" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsTaxCreditCarryforwardStateNotSubjectToExpirationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:to="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardStateNotSubjectToExpirationMember_019fdd54-8a02-7177-8a0e-65b404601ab0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardForeignNotSubjectToExpirationMember_019fdd54-ab8f-7012-8bf0-7f36e5cc052c" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardForeignNotSubjectToExpirationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardForeignNotSubjectToExpirationMember_019fdd54-ab8f-7012-8bf0-7f36e5cc052c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardForeignNotSubjectToExpirationMember_019fdd54-d254-768f-b20c-8532f2e7712a" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsTaxCreditCarryforwardForeignNotSubjectToExpirationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforwardMember_019fdd54-f7fb-7ab3-baec-ebfc8d830ff8" xlink:to="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardForeignNotSubjectToExpirationMember_019fdd54-d254-768f-b20c-8532f2e7712a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardFederalSubjectToExpiration_019fdd4d-88bd-7840-89fa-044127da986d" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardFederalSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardFederalSubjectToExpiration_019fdd4d-88bd-7840-89fa-044127da986d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardFederalSubjectToExpiration_019fdd50-597f-78b3-a41a-333c9b3b52af" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsTaxCreditCarryforwardFederalSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardFederalSubjectToExpiration_019fdd50-597f-78b3-a41a-333c9b3b52af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardStateSubjectToExpiration_019fdd4e-8cc2-79f9-969c-3a31ff95acdc" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardStateSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardStateSubjectToExpiration_019fdd4e-8cc2-79f9-969c-3a31ff95acdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardStateNotSubjectToExpiration_019fdd50-b47c-77ed-b0ef-6ad777c32d96" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsTaxCreditCarryforwardStateNotSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardStateNotSubjectToExpiration_019fdd50-b47c-77ed-b0ef-6ad777c32d96" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardForeignNotSubjectToExpiration_019fdd4f-2667-759a-8f5b-19ff9921b28e" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardForeignNotSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardForeignNotSubjectToExpiration_019fdd4f-2667-759a-8f5b-19ff9921b28e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardForeignNotSubjectToExpiration_019fdd51-07b3-78f0-80a2-4969a347b711" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsTaxCreditCarryforwardForeignNotSubjectToExpiration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsTaxCreditCarryforwardForeignNotSubjectToExpiration_019fdd51-07b3-78f0-80a2-4969a347b711" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforward_019fdd4f-c376-7bdb-9aa6-8a9f0508ed73" xlink:href="ph-20260630.xsd#ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_ph_DeferredTaxAssetsOperatingLossCarryforwardAndTaxCreditCarryforward_019fdd4f-c376-7bdb-9aa6-8a9f0508ed73" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_019ecc5e-5635-7926-9d9d-053f28f16a8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_019ecc5e-5635-7ec3-a599-48a311693ce2" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_019ecc5e-5635-7926-9d9d-053f28f16a8b" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/IncomeTaxesScheduleofIncomeTaxesPaidNetDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#IncomeTaxesScheduleofIncomeTaxesPaidNetDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/IncomeTaxesScheduleofIncomeTaxesPaidNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ebaef-4770-724b-9e96-6eb56658b247" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionTable_019ebaef-4770-7d42-bfad-a7ed01f2bab9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPaidByIndividualJurisdictionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ebaef-4770-724b-9e96-6eb56658b247" xlink:to="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionTable_019ebaef-4770-7d42-bfad-a7ed01f2bab9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_019ebaef-4770-77df-8904-44fab434ce00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionTable_019ebaef-4770-7d42-bfad-a7ed01f2bab9" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_019ebaef-4770-77df-8904-44fab434ce00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019ebaef-4770-77df-8904-44fab434ce00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019ebaef-4770-77df-8904-44fab434ce00" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019ebaef-4770-77df-8904-44fab434ce00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019ebaef-4770-789f-b1d3-ef97b758fb6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019ebaef-4770-77df-8904-44fab434ce00" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019ebaef-4770-789f-b1d3-ef97b758fb6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_019ed033-cc1e-7f64-9421-44f24af41cfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019ebaef-4770-789f-b1d3-ef97b758fb6c" xlink:to="loc_us-gaap_ForeignCountryMember_019ed033-cc1e-7f64-9421-44f24af41cfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019fc7b1-fbc4-7da3-a26a-7173044c9b7e" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ed033-cc1e-7f64-9421-44f24af41cfd" xlink:to="loc_country_CN_019fc7b1-fbc4-7da3-a26a-7173044c9b7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CH_019ebaef-4770-7938-be12-0780bb694a52" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_CH"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ed033-cc1e-7f64-9421-44f24af41cfd" xlink:to="loc_country_CH_019ebaef-4770-7938-be12-0780bb694a52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019fc7b2-4a2a-7316-8ace-0e33b0891906" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ed033-cc1e-7f64-9421-44f24af41cfd" xlink:to="loc_country_GB_019fc7b2-4a2a-7316-8ace-0e33b0891906" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignTaxJurisdictionOtherMember_019ebaef-4770-75d7-8d34-d8a6853702f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignTaxJurisdictionOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ed033-cc1e-7f64-9421-44f24af41cfd" xlink:to="loc_us-gaap_ForeignTaxJurisdictionOtherMember_019ebaef-4770-75d7-8d34-d8a6853702f3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019ebaef-4770-74fa-a5e3-77f51908d686" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPaidFederalAfterRefundReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ebaef-4770-724b-9e96-6eb56658b247" xlink:to="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019ebaef-4770-74fa-a5e3-77f51908d686" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019ebaef-4770-7646-af89-13c1bdd523b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ebaef-4770-724b-9e96-6eb56658b247" xlink:to="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019ebaef-4770-7646-af89-13c1bdd523b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceivedAbstract_019ebaaf-a622-7b19-910f-bb4fb6bda833" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPaidForeignAfterRefundReceivedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ebaef-4770-724b-9e96-6eb56658b247" xlink:to="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceivedAbstract_019ebaaf-a622-7b19-910f-bb4fb6bda833" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019ebaef-4770-7c31-be23-c5635950ea87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxPaidForeignAfterRefundReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceivedAbstract_019ebaaf-a622-7b19-910f-bb4fb6bda833" xlink:to="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019ebaef-4770-7c31-be23-c5635950ea87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019ebaef-4770-7032-ad5a-46fa593f38d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ebaef-4770-724b-9e96-6eb56658b247" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_019ebaef-4770-7032-ad5a-46fa593f38d4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/GoodwillandIntangibleAssetsScheduleofChangesinCarryingAmountofGoodwillDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#GoodwillandIntangibleAssetsScheduleofChangesinCarryingAmountofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/GoodwillandIntangibleAssetsScheduleofChangesinCarryingAmountofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019e4ba9-6ca0-7c49-b5d6-f581f02469bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019e4ba9-6ca0-76ef-934d-20fbe07e9f53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019e4ba9-6ca0-7c49-b5d6-f581f02469bc" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019e4ba9-6ca0-76ef-934d-20fbe07e9f53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6ca0-7ea4-8be6-8b26dd8bc6a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019e4ba9-6ca0-76ef-934d-20fbe07e9f53" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6ca0-7ea4-8be6-8b26dd8bc6a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6ca0-7ea4-8be6-8b26dd8bc6a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6ca0-7ea4-8be6-8b26dd8bc6a4" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6ca0-7ea4-8be6-8b26dd8bc6a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6ca0-7aad-80d1-40d7f225c421" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6ca0-7ea4-8be6-8b26dd8bc6a4" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6ca0-7aad-80d1-40d7f225c421" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6ca0-72de-8e32-ad060715777a" xlink:href="ph-20260630.xsd#ph_DiversifiedIndustrialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6ca0-7aad-80d1-40d7f225c421" xlink:to="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6ca0-72de-8e32-ad060715777a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6ca0-7e7f-9328-d6037a6c4a99" xlink:href="ph-20260630.xsd#ph_AerospaceSystemsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6ca0-7aad-80d1-40d7f225c421" xlink:to="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6ca0-7e7f-9328-d6037a6c4a99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019e4ba9-6ca0-767c-9574-d814df2fb5a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019e4ba9-6ca0-7c49-b5d6-f581f02469bc" xlink:to="loc_us-gaap_GoodwillRollForward_019e4ba9-6ca0-767c-9574-d814df2fb5a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e4ba9-6ca0-70ba-8c25-577b9d5e9283" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e4ba9-6ca0-767c-9574-d814df2fb5a2" xlink:to="loc_us-gaap_Goodwill_019e4ba9-6ca0-70ba-8c25-577b9d5e9283" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019e4ba9-6ca0-7d29-9959-6cac560c59ec" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e4ba9-6ca0-767c-9574-d814df2fb5a2" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019e4ba9-6ca0-7d29-9959-6cac560c59ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019e4ba9-6ca0-7e20-9ea0-f60584f72d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e4ba9-6ca0-767c-9574-d814df2fb5a2" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019e4ba9-6ca0-7e20-9ea0-f60584f72d9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019e4ba9-6ca0-79a4-a331-7636b711f7d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019e4ba9-6ca0-767c-9574-d814df2fb5a2" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019e4ba9-6ca0-79a4-a331-7636b711f7d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e4ba9-6ca0-70d2-89bb-0fef1b595391" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/GoodwillandIntangibleAssetsScheduleofGrossCarryingValueandAccumulatedAmortizationforEachCategoryofIntangibleAssetsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#GoodwillandIntangibleAssetsScheduleofGrossCarryingValueandAccumulatedAmortizationforEachCategoryofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/GoodwillandIntangibleAssetsScheduleofGrossCarryingValueandAccumulatedAmortizationforEachCategoryofIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e4ba9-6ca0-73d2-a25d-827e2b5eb308" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e4ba9-6ca0-7f8b-89a3-f218c4e68cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e4ba9-6ca0-73d2-a25d-827e2b5eb308" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e4ba9-6ca0-7f8b-89a3-f218c4e68cb5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e4ba9-6ca0-7b22-b4cf-a8f8b9c14e22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e4ba9-6ca0-7f8b-89a3-f218c4e68cb5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e4ba9-6ca0-7b22-b4cf-a8f8b9c14e22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7b22-b4cf-a8f8b9c14e22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e4ba9-6ca0-7b22-b4cf-a8f8b9c14e22" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7b22-b4cf-a8f8b9c14e22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7582-9f09-1b5011a21f4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e4ba9-6ca0-7b22-b4cf-a8f8b9c14e22" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7582-9f09-1b5011a21f4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_PatentsAndTechnologyMember_019e4ba9-6ca0-742c-a0f7-c101f3ff2630" xlink:href="ph-20260630.xsd#ph_PatentsAndTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7582-9f09-1b5011a21f4e" xlink:to="loc_ph_PatentsAndTechnologyMember_019e4ba9-6ca0-742c-a0f7-c101f3ff2630" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019e4ba9-6ca0-7a30-b91f-254538f50f7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7582-9f09-1b5011a21f4e" xlink:to="loc_us-gaap_TradeNamesMember_019e4ba9-6ca0-7a30-b91f-254538f50f7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CustomerRelationshipsAndOtherMember_019e4ba9-6ca0-7724-b4eb-43b9c045cb93" xlink:href="ph-20260630.xsd#ph_CustomerRelationshipsAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e4ba9-6ca0-7582-9f09-1b5011a21f4e" xlink:to="loc_ph_CustomerRelationshipsAndOtherMember_019e4ba9-6ca0-7724-b4eb-43b9c045cb93" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e4ba9-6ca0-7fc7-b182-c8cb13dacdd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e4ba9-6ca0-73d2-a25d-827e2b5eb308" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019e4ba9-6ca0-7fc7-b182-c8cb13dacdd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e4ba9-6ca0-76db-b9dd-c8b7e25b7868" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e4ba9-6ca0-73d2-a25d-827e2b5eb308" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e4ba9-6ca0-76db-b9dd-c8b7e25b7868" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/DebtScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#DebtScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/DebtScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-748c-b779-298a2f692074" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-748c-b779-298a2f692074" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6ca0-74e5-b4a4-3d1237dd098e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-748c-b779-298a2f692074" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6ca0-74e5-b4a4-3d1237dd098e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-74e5-b4a4-3d1237dd098e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6ca0-74e5-b4a4-3d1237dd098e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-74e5-b4a4-3d1237dd098e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6ca0-74e5-b4a4-3d1237dd098e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FixedRateMediumTermNotes4.20Due2035Member_019e4ba9-6ca0-77c8-ae26-94cc1a23b60a" xlink:href="ph-20260630.xsd#ph_FixedRateMediumTermNotes4.20Due2035Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_FixedRateMediumTermNotes4.20Due2035Member_019e4ba9-6ca0-77c8-ae26-94cc1a23b60a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FixedRateMediumTermNotes6.25Due2038Member_019e4ba9-6ca0-7d20-88d9-ccc67d4f8500" xlink:href="ph-20260630.xsd#ph_FixedRateMediumTermNotes6.25Due2038Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_FixedRateMediumTermNotes6.25Due2038Member_019e4ba9-6ca0-7d20-88d9-ccc67d4f8500" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FixedRateMediumTermNotes4.45Due2045Member_019e4ba9-6ca0-74f4-b0d0-026ad5c65ff2" xlink:href="ph-20260630.xsd#ph_FixedRateMediumTermNotes4.45Due2045Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_FixedRateMediumTermNotes4.45Due2045Member_019e4ba9-6ca0-74f4-b0d0-026ad5c65ff2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SeniorNotes3.25Due2027Member_019e4ba9-6ca0-7e04-bb18-b773c237ec10" xlink:href="ph-20260630.xsd#ph_SeniorNotes3.25Due2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_SeniorNotes3.25Due2027Member_019e4ba9-6ca0-7e04-bb18-b773c237ec10" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SeniorNotes4.25Due2028Member_019e4ba9-6ca0-77f4-a1d9-7473ed3fff51" xlink:href="ph-20260630.xsd#ph_SeniorNotes4.25Due2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_SeniorNotes4.25Due2028Member_019e4ba9-6ca0-77f4-a1d9-7473ed3fff51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SeniorNotes3.25Due2029Member_019e4ba9-6ca0-7a65-854e-77b232582e2b" xlink:href="ph-20260630.xsd#ph_SeniorNotes3.25Due2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_SeniorNotes3.25Due2029Member_019e4ba9-6ca0-7a65-854e-77b232582e2b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SeniorNotes4.50Due2030Member_019e4ba9-6ca0-7f38-aaf4-de992fb2c80a" xlink:href="ph-20260630.xsd#ph_SeniorNotes4.50Due2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_SeniorNotes4.50Due2030Member_019e4ba9-6ca0-7f38-aaf4-de992fb2c80a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SeniorNotes4.10Due2047Member_019e4ba9-6ca0-7c34-a5bc-5537f1592f0a" xlink:href="ph-20260630.xsd#ph_SeniorNotes4.10Due2047Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_SeniorNotes4.10Due2047Member_019e4ba9-6ca0-7c34-a5bc-5537f1592f0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SeniorNotes4.00Due2049Member_019e4ba9-6ca0-7b9c-8ee3-593abcbdd55e" xlink:href="ph-20260630.xsd#ph_SeniorNotes4.00Due2049Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_SeniorNotes4.00Due2049Member_019e4ba9-6ca0-7b9c-8ee3-593abcbdd55e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_EuroSeniorNotes2.90Due2030Member_019e4ba9-6ca0-7f3e-8f59-955bf6cd40ee" xlink:href="ph-20260630.xsd#ph_EuroSeniorNotes2.90Due2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6ca0-7150-aaad-15d257d2d5a2" xlink:to="loc_ph_EuroSeniorNotes2.90Due2030Member_019e4ba9-6ca0-7f3e-8f59-955bf6cd40ee" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6ca0-7c75-b8d1-62f13f99535b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-748c-b779-298a2f692074" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6ca0-7c75-b8d1-62f13f99535b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6ca0-7c75-b8d1-62f13f99535b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6ca0-7c75-b8d1-62f13f99535b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6ca0-7c75-b8d1-62f13f99535b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6ca0-7457-a9d1-4c7d0afeeba0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6ca0-7c75-b8d1-62f13f99535b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6ca0-7457-a9d1-4c7d0afeeba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_019e4ba9-6ca0-7a4c-895f-8c6de473146e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MediumTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6ca0-7457-a9d1-4c7d0afeeba0" xlink:to="loc_us-gaap_MediumTermNotesMember_019e4ba9-6ca0-7a4c-895f-8c6de473146e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019e4ba9-6ca0-764e-9893-a6d6563c6694" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6ca0-7457-a9d1-4c7d0afeeba0" xlink:to="loc_us-gaap_SeniorNotesMember_019e4ba9-6ca0-764e-9893-a6d6563c6694" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e4ba9-6ca0-7bb2-a398-65899bc2073f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e4ba9-6ca0-7bb2-a398-65899bc2073f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e4ba9-6ca0-78d3-a8e5-bb18afb8df05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_LongTermDebt_019e4ba9-6ca0-78d3-a8e5-bb18afb8df05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_019e4ba9-6ca0-7535-b7dc-90ad099a4a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_OtherLongTermDebt_019e4ba9-6ca0-7535-b7dc-90ad099a4a7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019e4ba9-6ca0-70e9-acb1-bef7c9aa77c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019e4ba9-6ca0-70e9-acb1-bef7c9aa77c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_019e4ba9-6ca0-7776-ad58-b9ff789a8aaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_DebtCurrent_019e4ba9-6ca0-7776-ad58-b9ff789a8aaf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019e4ba9-6ca0-70f1-9235-66d0b79aec59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7934-a6ae-78e532672ff3" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_019e4ba9-6ca0-70f1-9235-66d0b79aec59" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e81ce-09da-7de6-9940-00219fc53b99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:to="loc_us-gaap_CreditFacilityAxis_019e81ce-09da-7de6-9940-00219fc53b99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e81ce-09da-7de6-9940-00219fc53b99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e81ce-09da-7de6-9940-00219fc53b99" xlink:to="loc_us-gaap_CreditFacilityDomain_019e81ce-09da-7de6-9940-00219fc53b99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e81ce-09da-7cd6-bbfc-5b6569d5730b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e81ce-09da-7de6-9940-00219fc53b99" xlink:to="loc_us-gaap_CreditFacilityDomain_019e81ce-09da-7cd6-bbfc-5b6569d5730b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019e81ce-09da-73f8-a809-7ae1dd72a4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e81ce-09da-7cd6-bbfc-5b6569d5730b" xlink:to="loc_us-gaap_SecuredDebtMember_019e81ce-09da-73f8-a809-7ae1dd72a4f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e81ce-09da-7dea-b901-ecf0b66a402b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e81ce-09da-7dea-b901-ecf0b66a402b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7dea-b901-ecf0b66a402b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e81ce-09da-7dea-b901-ecf0b66a402b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7dea-b901-ecf0b66a402b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7f06-8562-aec6f5063f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e81ce-09da-7dea-b901-ecf0b66a402b" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7f06-8562-aec6f5063f1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_TermLoanAgreementMember_019fec2a-c876-7d5c-8149-98b64767edaf" xlink:href="ph-20260630.xsd#ph_TermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7f06-8562-aec6f5063f1c" xlink:to="loc_ph_TermLoanAgreementMember_019fec2a-c876-7d5c-8149-98b64767edaf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_ThreeHundredSixtyFourDayTermLoanAgreementMember_019e81ce-09da-7962-a79e-e66376a9561e" xlink:href="ph-20260630.xsd#ph_ThreeHundredSixtyFourDayTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_TermLoanAgreementMember_019fec2a-c876-7d5c-8149-98b64767edaf" xlink:to="loc_ph_ThreeHundredSixtyFourDayTermLoanAgreementMember_019e81ce-09da-7962-a79e-e66376a9561e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_ThreeYearTermLoanAgreementMember_019e81ce-09da-778a-86e1-0ee05e92c050" xlink:href="ph-20260630.xsd#ph_ThreeYearTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ph_TermLoanAgreementMember_019fec2a-c876-7d5c-8149-98b64767edaf" xlink:to="loc_ph_ThreeYearTermLoanAgreementMember_019e81ce-09da-778a-86e1-0ee05e92c050" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FiltrationGroupCreditFacilitiesMember_019e81ce-09da-7ac5-9698-22273aae006b" xlink:href="ph-20260630.xsd#ph_FiltrationGroupCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7f06-8562-aec6f5063f1c" xlink:to="loc_ph_FiltrationGroupCreditFacilitiesMember_019e81ce-09da-7ac5-9698-22273aae006b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_MultiCurrencyCreditAgreementMember_019e81ce-32e2-7aa5-8008-4b051ea59979" xlink:href="ph-20260630.xsd#ph_MultiCurrencyCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e81ce-09da-7f06-8562-aec6f5063f1c" xlink:to="loc_ph_MultiCurrencyCreditAgreementMember_019e81ce-32e2-7aa5-8008-4b051ea59979" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e81ce-09da-748a-b4a0-9fe0a4a70721" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e81ce-09da-748a-b4a0-9fe0a4a70721" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e81ce-09da-748a-b4a0-9fe0a4a70721_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e81ce-09da-748a-b4a0-9fe0a4a70721" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e81ce-09da-748a-b4a0-9fe0a4a70721_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e81ce-09da-7d03-8287-a6b8e4919d74" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e81ce-09da-748a-b4a0-9fe0a4a70721" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e81ce-09da-7d03-8287-a6b8e4919d74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e81ce-09da-709c-a4a9-e1c8e3543aad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e81ce-09da-7d03-8287-a6b8e4919d74" xlink:to="loc_us-gaap_LineOfCreditMember_019e81ce-09da-709c-a4a9-e1c8e3543aad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_019e81ce-32e2-7f20-9ce3-8973b861c5bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_019e81ce-32e2-7f20-9ce3-8973b861c5bf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019e81ce-32e2-7f20-9ce3-8973b861c5bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019e81ce-32e2-7f20-9ce3-8973b861c5bf" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019e81ce-32e2-7f20-9ce3-8973b861c5bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019e81ce-32e2-79d0-b7bc-a121a450b16e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_019e81ce-32e2-7f20-9ce3-8973b861c5bf" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019e81ce-32e2-79d0-b7bc-a121a450b16e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_019e81ce-32e2-719e-b556-c3d21de3bc24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_019e81ce-32e2-79d0-b7bc-a121a450b16e" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_019e81ce-32e2-719e-b556-c3d21de3bc24" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019fec0b-f047-7cff-a281-5345c7a0af73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4ba9-6ca0-730d-badd-f61e538be12e" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019fec0b-f047-7cff-a281-5345c7a0af73" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fec0b-f047-7cff-a281-5345c7a0af73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fec0b-f047-7cff-a281-5345c7a0af73" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fec0b-f047-7cff-a281-5345c7a0af73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fec0b-f047-75fa-9a71-5a04a509fe1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fec0b-f047-7cff-a281-5345c7a0af73" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fec0b-f047-75fa-9a71-5a04a509fe1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019fec0c-128b-7339-b781-49bc8787725a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019fec0b-f047-75fa-9a71-5a04a509fe1d" xlink:to="loc_us-gaap_SubsequentEventMember_019fec0c-128b-7339-b781-49bc8787725a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019e81ce-09da-708d-be5c-eb87eeefa9e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_DebtInstrumentTerm_019e81ce-09da-708d-be5c-eb87eeefa9e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e81ce-09da-7d58-8e68-1a9878a75dd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e81ce-09da-7d58-8e68-1a9878a75dd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e81ce-09da-7254-a84a-5636dd128ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_LongTermDebt_019e81ce-09da-7254-a84a-5636dd128ae5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLinesOfCredit_019fec2c-02c8-7c79-91d9-6c49d8e86f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_ProceedsFromLinesOfCredit_019fec2c-02c8-7c79-91d9-6c49d8e86f3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e81ce-32e2-7d3d-8e40-ae6e75ea7200" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e81ce-32e2-7d3d-8e40-ae6e75ea7200" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_019e81ce-32e2-75d3-a649-ac40a287c0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_019e81ce-32e2-75d3-a649-ac40a287c0bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DebtInstrumentExtensionOptionTerm_019f8f73-e984-79fc-a87a-46f167e651d4" xlink:href="ph-20260630.xsd#ph_DebtInstrumentExtensionOptionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_ph_DebtInstrumentExtensionOptionTerm_019f8f73-e984-79fc-a87a-46f167e651d4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaper_019e81ce-32e2-7154-a02e-b5590b5cbceb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPaper"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_CommercialPaper_019e81ce-32e2-7154-a02e-b5590b5cbceb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_019e81ce-32e2-7f27-b86a-2957960a161c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e4ba9-6ca0-7df5-8efb-88a7fd2faa6d" xlink:to="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_019e81ce-32e2-7f27-b86a-2957960a161c" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/DebtCovenantsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#DebtCovenantsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/DebtCovenantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e81cc-ed22-72c2-8e72-adcf7dd3789f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e81cc-ed22-7595-9104-a2f50332095b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e81cc-ed22-72c2-8e72-adcf7dd3789f" xlink:to="loc_us-gaap_DebtInstrumentTable_019e81cc-ed22-7595-9104-a2f50332095b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e81cc-ed22-7853-a479-8b062d0ecf72" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e81cc-ed22-7595-9104-a2f50332095b" xlink:to="loc_srt_RangeAxis_019e81cc-ed22-7853-a479-8b062d0ecf72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e81cc-ed22-7853-a479-8b062d0ecf72_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e81cc-ed22-7853-a479-8b062d0ecf72" xlink:to="loc_srt_RangeMember_019e81cc-ed22-7853-a479-8b062d0ecf72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e81cc-ed22-70e9-942a-ce6ebdb99ee7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e81cc-ed22-7853-a479-8b062d0ecf72" xlink:to="loc_srt_RangeMember_019e81cc-ed22-70e9-942a-ce6ebdb99ee7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e81cc-ed22-7f46-a7ee-6a2d74ed5ed8" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e81cc-ed22-70e9-942a-ce6ebdb99ee7" xlink:to="loc_srt_MaximumMember_019e81cc-ed22-7f46-a7ee-6a2d74ed5ed8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DebtInstrumentCovenantTermDebtToDebtShareholdersEquityRatio_019e81cc-ed22-7f82-9d70-c461e74d44a3" xlink:href="ph-20260630.xsd#ph_DebtInstrumentCovenantTermDebtToDebtShareholdersEquityRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e81cc-ed22-72c2-8e72-adcf7dd3789f" xlink:to="loc_ph_DebtInstrumentCovenantTermDebtToDebtShareholdersEquityRatio_019e81cc-ed22-7f82-9d70-c461e74d44a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DebtInstrumentDebtToDebtShareholdersEquityRatio_019e81cc-ed22-7320-86bf-6619bf4087d4" xlink:href="ph-20260630.xsd#ph_DebtInstrumentDebtToDebtShareholdersEquityRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e81cc-ed22-72c2-8e72-adcf7dd3789f" xlink:to="loc_ph_DebtInstrumentDebtToDebtShareholdersEquityRatio_019e81cc-ed22-7320-86bf-6619bf4087d4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofDefinedBenefitPensionandOtherPostretirementBenefitPlansDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofDefinedBenefitPensionandOtherPostretirementBenefitPlansDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofDefinedBenefitPensionandOtherPostretirementBenefitPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7c05-8d0f-10a65e57da12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7c05-8d0f-10a65e57da12" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-7809-a9ec-10fc3a3778c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7c05-8d0f-10a65e57da12" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-7809-a9ec-10fc3a3778c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-7809-a9ec-10fc3a3778c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-7809-a9ec-10fc3a3778c7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-7809-a9ec-10fc3a3778c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-746b-ae3f-e8db4d72101a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-7809-a9ec-10fc3a3778c7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-746b-ae3f-e8db4d72101a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6ca0-7066-ae92-87d484bdf94d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-746b-ae3f-e8db4d72101a" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6ca0-7066-ae92-87d484bdf94d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6ca0-7246-965d-5ecbe4c7bbc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-746b-ae3f-e8db4d72101a" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6ca0-7246-965d-5ecbe4c7bbc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b15-8adf-8717497b6f5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7c05-8d0f-10a65e57da12" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b15-8adf-8717497b6f5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7b15-8adf-8717497b6f5e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b15-8adf-8717497b6f5e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7b15-8adf-8717497b6f5e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7259-8e4d-230ead8ec93c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b15-8adf-8717497b6f5e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7259-8e4d-230ead8ec93c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019e4ba9-6ca0-7d73-b2b2-8bef73c8863f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7259-8e4d-230ead8ec93c" xlink:to="loc_us-gaap_DomesticPlanMember_019e4ba9-6ca0-7d73-b2b2-8bef73c8863f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e4ba9-6ca0-7301-8e07-a1d425cfe3b8" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019e4ba9-6ca0-7d73-b2b2-8bef73c8863f" xlink:to="loc_country_US_019e4ba9-6ca0-7301-8e07-a1d425cfe3b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019e4ba9-6ca0-7434-a8f3-06801349b491" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7259-8e4d-230ead8ec93c" xlink:to="loc_us-gaap_ForeignPlanMember_019e4ba9-6ca0-7434-a8f3-06801349b491" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_019e4ba9-6ca0-7627-83c8-cc3d397b4198" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_019e4ba9-6ca0-7627-83c8-cc3d397b4198" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_019e4ba9-6ca0-733a-8992-9ea7e85ba4a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_019e4ba9-6ca0-733a-8992-9ea7e85ba4a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019e4ba9-6ca0-7694-b0bc-a84d9fbcf9c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019e4ba9-6ca0-7694-b0bc-a84d9fbcf9c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_019e4ba9-6ca0-7e4f-9edf-7f9d5cf4731e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_019e4ba9-6ca0-7e4f-9edf-7f9d5cf4731e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_019e4ba9-6ca0-7cd1-a03a-975a392e290f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_019e4ba9-6ca0-7cd1-a03a-975a392e290f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_019e4ba9-6ca0-770c-9e2f-277b2a2f7928" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_019e4ba9-6ca0-770c-9e2f-277b2a2f7928" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019e4ba9-6ca0-7ba8-b021-0edce3b2237c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-7589-ba24-6bf44e877633" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019e4ba9-6ca0-7ba8-b021-0edce3b2237c" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofChangeinBenefitObligationandPlanAssetsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofChangeinBenefitObligationandPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofChangeinBenefitObligationandPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7e58-8c5c-718240b12efa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7e58-8c5c-718240b12efa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-784b-8444-68bbe9c79d0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7e58-8c5c-718240b12efa" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-784b-8444-68bbe9c79d0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-784b-8444-68bbe9c79d0a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-784b-8444-68bbe9c79d0a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-784b-8444-68bbe9c79d0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-7027-835d-4664e6d3f955" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6ca0-784b-8444-68bbe9c79d0a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-7027-835d-4664e6d3f955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6ca0-7971-ba98-47d0dac71828" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-7027-835d-4664e6d3f955" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6ca0-7971-ba98-47d0dac71828" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6ca0-7e3a-9b6f-df316a680ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6ca0-7027-835d-4664e6d3f955" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6ca0-7e3a-9b6f-df316a680ffa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b82-b3b0-981231ad8e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6ca0-7e58-8c5c-718240b12efa" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b82-b3b0-981231ad8e4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7b82-b3b0-981231ad8e4b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b82-b3b0-981231ad8e4b" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7b82-b3b0-981231ad8e4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7433-a77e-f771ea020a20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6ca0-7b82-b3b0-981231ad8e4b" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7433-a77e-f771ea020a20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019e4ba9-6ca0-771d-a255-33d8443865b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7433-a77e-f771ea020a20" xlink:to="loc_us-gaap_DomesticPlanMember_019e4ba9-6ca0-771d-a255-33d8443865b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e4ba9-6ca0-7f53-a504-46565e721426" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019e4ba9-6ca0-771d-a255-33d8443865b2" xlink:to="loc_country_US_019e4ba9-6ca0-7f53-a504-46565e721426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019e4ba9-6ca0-7d1d-97d2-d0cff53caa8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6ca0-7433-a77e-f771ea020a20" xlink:to="loc_us-gaap_ForeignPlanMember_019e4ba9-6ca0-7d1d-97d2-d0cff53caa8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_019e4ba9-6ca0-7e75-8e3b-5d87e0a4588e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_019e4ba9-6ca0-7e75-8e3b-5d87e0a4588e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_019e4ba9-6ca0-77fe-a489-08a42befe1d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_019e4ba9-6ca0-77fe-a489-08a42befe1d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_019e4ba9-6ca0-77d8-883f-359de34e1a41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_019e4ba9-6ca0-77d8-883f-359de34e1a41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation_019e4ba9-6ca0-7b68-bdf6-9bfa40b61987" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsBenefitObligation_019e4ba9-6ca0-7b68-bdf6-9bfa40b61987" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_019e4ba9-6d5e-742a-baef-c9a0e538af60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_019e4ba9-6d5e-742a-baef-c9a0e538af60" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_019e4ba9-6d5e-788b-86e1-2e632f7ee274" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_019e4ba9-6d5e-788b-86e1-2e632f7ee274" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement_019e4ba9-6d5e-72a4-a112-c2284917e74e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationPaymentForSettlement_019e4ba9-6d5e-72a4-a112-c2284917e74e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAmendments_019e4ba9-6d5e-7a1e-984b-3ead5d201fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPlanAmendments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAmendments_019e4ba9-6d5e-7a1e-984b-3ead5d201fd4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_019e4ba9-6d5e-7f2a-8143-7832d13f919d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_019e4ba9-6ca0-7490-8964-349e8439e871" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_019e4ba9-6d5e-7f2a-8143-7832d13f919d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_019e4ba9-6d5e-75a2-93f0-c2632f43b798" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-747a-9fc1-77c7c2f819d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-747a-9fc1-77c7c2f819d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_019e4ba9-6d5e-79f8-94ad-0f7661015fdd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_019e4ba9-6d5e-79f8-94ad-0f7661015fdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets_019f195e-00a5-738c-aeba-080ce600d600" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets_019f195e-00a5-738c-aeba-080ce600d600" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_019e4ba9-6d5e-7570-8d81-3474a5cb42f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_019e4ba9-6d5e-7570-8d81-3474a5cb42f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_019e4ba9-6d5e-73ef-9e1a-924778a8f244" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_019e4ba9-6d5e-73ef-9e1a-924778a8f244" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_019e4ba9-6d5e-7099-b2ad-d2553ddd96df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_019e4ba9-6d5e-7099-b2ad-d2553ddd96df" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_019e4ba9-6d5e-78a2-88a6-61d4d3bd1c73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_019e4ba9-6d5e-730b-ba30-822dbf4ae9fb" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_019e4ba9-6d5e-78a2-88a6-61d4d3bd1c73" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-7879-adc6-f537ab7bb4dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_019e4ba9-6d5e-7aaf-8523-f7ab4b0c667f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_019e4ba9-6d5e-7aaf-8523-f7ab4b0c667f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_019e4ba9-6d5e-702b-b7b5-527560aaf8cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_019e4ba9-6d5e-702b-b7b5-527560aaf8cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_019e4ba9-6d5e-7ead-874a-ac2bc2f1cd5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_019e4ba9-6d5e-702b-b7b5-527560aaf8cd" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_019e4ba9-6d5e-7ead-874a-ac2bc2f1cd5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_019e4ba9-6d5e-7b69-9e3f-6a846d861416" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_019e4ba9-6d5e-702b-b7b5-527560aaf8cd" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_019e4ba9-6d5e-7b69-9e3f-6a846d861416" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_019e4ba9-6d5e-7f0d-8908-f17e66f23400" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_019e4ba9-6d5e-702b-b7b5-527560aaf8cd" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_019e4ba9-6d5e-7f0d-8908-f17e66f23400" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_019e4ba9-6d5e-7239-8e4a-f75347a52014" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheetAbstract_019e4ba9-6d5e-702b-b7b5-527560aaf8cd" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_019e4ba9-6d5e-7239-8e4a-f75347a52014" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_019e4ba9-6d5e-7b0a-9d51-147d118e71d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6ca0-73e4-8757-9d0d611540af" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_019e4ba9-6d5e-7b0a-9d51-147d118e71d5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_019e4ba9-6d5e-71d8-ad02-0b7b7f6edb82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_019e4ba9-6d5e-7b0a-9d51-147d118e71d5" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_019e4ba9-6d5e-71d8-ad02-0b7b7f6edb82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_019e4ba9-6d5e-75e6-81b2-8cb982a0ecf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_019e4ba9-6d5e-7b0a-9d51-147d118e71d5" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_019e4ba9-6d5e-75e6-81b2-8cb982a0ecf5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_019e4ba9-6d5e-798c-95a4-bea7d1f3553a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_019e4ba9-6d5e-7b0a-9d51-147d118e71d5" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_019e4ba9-6d5e-798c-95a4-bea7d1f3553a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-757e-8590-ca63cb289354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-757e-8590-ca63cb289354" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7dbd-ba79-c1a66d39e037" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-757e-8590-ca63cb289354" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7dbd-ba79-c1a66d39e037" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7dbd-ba79-c1a66d39e037_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7dbd-ba79-c1a66d39e037" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7dbd-ba79-c1a66d39e037_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7ee6-bcb9-8e1945cda259" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7dbd-ba79-c1a66d39e037" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7ee6-bcb9-8e1945cda259" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-7e09-a3c9-8645e9cde680" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7ee6-bcb9-8e1945cda259" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-7e09-a3c9-8645e9cde680" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7176-b9a3-4ae3bcc75d80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-757e-8590-ca63cb289354" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7176-b9a3-4ae3bcc75d80" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7176-b9a3-4ae3bcc75d80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7176-b9a3-4ae3bcc75d80" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7176-b9a3-4ae3bcc75d80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7b45-b36c-22f19f8a82ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7176-b9a3-4ae3bcc75d80" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7b45-b36c-22f19f8a82ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_019e4ba9-6d5e-7245-9e69-41efb272385c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7b45-b36c-22f19f8a82ea" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_019e4ba9-6d5e-7245-9e69-41efb272385c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e4ba9-6d5e-7b2f-8b80-b55673111c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7b45-b36c-22f19f8a82ea" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e4ba9-6d5e-7b2f-8b80-b55673111c7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefinedBenefitPlanAssetCategoriesOtherMember_019e4ba9-6d5e-7da8-9216-3c37aaa43ab2" xlink:href="ph-20260630.xsd#ph_DefinedBenefitPlanAssetCategoriesOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7b45-b36c-22f19f8a82ea" xlink:to="loc_ph_DefinedBenefitPlanAssetCategoriesOtherMember_019e4ba9-6d5e-7da8-9216-3c37aaa43ab2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember_019e4ba9-6d5e-7c4d-ba0d-137a01458733" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7b45-b36c-22f19f8a82ea" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember_019e4ba9-6d5e-7c4d-ba0d-137a01458733" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e4ba9-6d5e-7276-848f-4938e4a3f32b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-757e-8590-ca63cb289354" xlink:to="loc_srt_RangeAxis_019e4ba9-6d5e-7276-848f-4938e4a3f32b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6d5e-7276-848f-4938e4a3f32b_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e4ba9-6d5e-7276-848f-4938e4a3f32b" xlink:to="loc_srt_RangeMember_019e4ba9-6d5e-7276-848f-4938e4a3f32b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6d5e-7e87-982e-cd882105cc0f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e4ba9-6d5e-7276-848f-4938e4a3f32b" xlink:to="loc_srt_RangeMember_019e4ba9-6d5e-7e87-982e-cd882105cc0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e4ba9-6d5e-7596-bdb3-fe4def357eab" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6d5e-7e87-982e-cd882105cc0f" xlink:to="loc_srt_MaximumMember_019e4ba9-6d5e-7596-bdb3-fe4def357eab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7963-8fe6-a51ec901f35e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-757e-8590-ca63cb289354" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7963-8fe6-a51ec901f35e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7963-8fe6-a51ec901f35e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7963-8fe6-a51ec901f35e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7963-8fe6-a51ec901f35e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c9b-9ac9-181890e7f1b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7963-8fe6-a51ec901f35e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c9b-9ac9-181890e7f1b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-78d7-af17-a44d4576f753" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c9b-9ac9-181890e7f1b1" xlink:to="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-78d7-af17-a44d4576f753" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e4ba9-6d5e-7c17-b7f5-dd79bc87f24b" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-78d7-af17-a44d4576f753" xlink:to="loc_country_US_019e4ba9-6d5e-7c17-b7f5-dd79bc87f24b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019e4ba9-6d5e-7fef-bd6e-6576d6cc82d9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c9b-9ac9-181890e7f1b1" xlink:to="loc_us-gaap_ForeignPlanMember_019e4ba9-6d5e-7fef-bd6e-6576d6cc82d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_019e4ba9-6d5e-7bb8-be5b-f2c1bc4d3efc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_019e4ba9-6d5e-7bb8-be5b-f2c1bc4d3efc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_019e4ba9-6d5e-7ad9-94d6-794b4565b326" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_019e4ba9-6d5e-7ad9-94d6-794b4565b326" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_019e4ba9-6d5e-79c7-9cab-f6fe2d0b70d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_019e4ba9-6d5e-79c7-9cab-f6fe2d0b70d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedPercentOfNetAssets_019e4ba9-6d5e-7829-a596-8e75460043f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentOwnedPercentOfNetAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_InvestmentOwnedPercentOfNetAssets_019e4ba9-6d5e-7829-a596-8e75460043f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_019fc7d7-c707-77bf-8594-fc20788b5045" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_019fc7d7-c707-77bf-8594-fc20788b5045" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_SharesInvestedByEmployeesInCompanyStock_019e4ba9-6d5e-76bc-b2d2-ef2bae1f48bd" xlink:href="ph-20260630.xsd#ph_SharesInvestedByEmployeesInCompanyStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_ph_SharesInvestedByEmployeesInCompanyStock_019e4ba9-6d5e-76bc-b2d2-ef2bae1f48bd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefinedContributionPlanAnnualContributionsPerEmployeeNotGrandfatheredPercent_019e4ba9-6d5e-71d8-9907-be9364992824" xlink:href="ph-20260630.xsd#ph_DefinedContributionPlanAnnualContributionsPerEmployeeNotGrandfatheredPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_ph_DefinedContributionPlanAnnualContributionsPerEmployeeNotGrandfatheredPercent_019e4ba9-6d5e-71d8-9907-be9364992824" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_019e4ba9-6d5e-78f0-bd46-9d228ef3dadb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_019e4ba9-6d5e-78f0-bd46-9d228ef3dadb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedAmount_019e4ba9-6d5e-7883-85dc-3923be6ab022" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LifeInsuranceCorporateOrBankOwnedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedAmount_019e4ba9-6d5e-7883-85dc-3923be6ab022" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_019e4ba9-6d5e-7f2f-a230-986240a99218" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-7612-bcf0-970ef1360dc7" xlink:to="loc_us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent_019e4ba9-6d5e-7f2f-a230-986240a99218" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofInformationforPensionPlanswithAccumulatedBenefitObligationsinExcessofPlanAssetsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofInformationforPensionPlanswithAccumulatedBenefitObligationsinExcessofPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofInformationforPensionPlanswithAccumulatedBenefitObligationsinExcessofPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7101-a4d0-afcc4a01773c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-70ab-8022-e6f1e78d5230" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7101-a4d0-afcc4a01773c" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-70ab-8022-e6f1e78d5230" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-76eb-b98a-2b4d353bfda9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-70ab-8022-e6f1e78d5230" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-76eb-b98a-2b4d353bfda9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-76eb-b98a-2b4d353bfda9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-76eb-b98a-2b4d353bfda9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-76eb-b98a-2b4d353bfda9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-79f9-bfe6-2ea3253b83f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-76eb-b98a-2b4d353bfda9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-79f9-bfe6-2ea3253b83f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-738a-9fb7-349858aa4887" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-79f9-bfe6-2ea3253b83f8" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-738a-9fb7-349858aa4887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_019e4ba9-6d5e-71a8-8e92-003a75525227" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7101-a4d0-afcc4a01773c" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_019e4ba9-6d5e-71a8-8e92-003a75525227" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_019e4ba9-6d5e-7964-8df8-1144c79ac550" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7101-a4d0-afcc4a01773c" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_019e4ba9-6d5e-7964-8df8-1144c79ac550" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofInformationforPensionPlanswithProjectedBenefitObligationsinExcessofPlanAssetsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofInformationforPensionPlanswithProjectedBenefitObligationsinExcessofPlanAssetsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofInformationforPensionPlanswithProjectedBenefitObligationsinExcessofPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-75f0-a949-2587232ddbbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-70a0-b1d6-c3df639150ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-75f0-a949-2587232ddbbf" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-70a0-b1d6-c3df639150ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-749e-8d65-a693903e494f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-70a0-b1d6-c3df639150ef" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-749e-8d65-a693903e494f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-749e-8d65-a693903e494f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-749e-8d65-a693903e494f" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-749e-8d65-a693903e494f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-792b-9300-7c9837edd6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-749e-8d65-a693903e494f" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-792b-9300-7c9837edd6ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-7e78-96e4-dbea9849b30a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-792b-9300-7c9837edd6ac" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-7e78-96e4-dbea9849b30a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_019e4ba9-6d5e-7f4a-8bcc-f1cf903b6409" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-75f0-a949-2587232ddbbf" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_019e4ba9-6d5e-7f4a-8bcc-f1cf903b6409" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_019e4ba9-6d5e-7b3b-9df4-b9f6682899b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-75f0-a949-2587232ddbbf" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_019e4ba9-6d5e-7b3b-9df4-b9f6682899b9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofEstimatedBenefitPaymentsareExpectedtobePaidDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofEstimatedBenefitPaymentsareExpectedtobePaidDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofEstimatedBenefitPaymentsareExpectedtobePaidDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-7717-88d4-86d7b7dc8514" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-7717-88d4-86d7b7dc8514" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7053-97b3-304fb108c70c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-7717-88d4-86d7b7dc8514" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7053-97b3-304fb108c70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7053-97b3-304fb108c70c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7053-97b3-304fb108c70c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7053-97b3-304fb108c70c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c85-adee-a854dbbb49ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7053-97b3-304fb108c70c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c85-adee-a854dbbb49ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-7fa7-9069-969c94ad1106" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c85-adee-a854dbbb49ac" xlink:to="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-7fa7-9069-969c94ad1106" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e4ba9-6d5e-70d5-92ae-aac82cdb1b75" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-7fa7-9069-969c94ad1106" xlink:to="loc_country_US_019e4ba9-6d5e-70d5-92ae-aac82cdb1b75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019e4ba9-6d5e-725d-a0ac-157069cdbef1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7c85-adee-a854dbbb49ac" xlink:to="loc_us-gaap_ForeignPlanMember_019e4ba9-6d5e-725d-a0ac-157069cdbef1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-740b-954c-2189328c3758" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_019e4ba9-6d5e-7717-88d4-86d7b7dc8514" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-740b-954c-2189328c3758" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-740b-954c-2189328c3758_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-740b-954c-2189328c3758" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-740b-954c-2189328c3758_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7b0e-9c70-ce2582019b69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-740b-954c-2189328c3758" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7b0e-9c70-ce2582019b69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-7b52-a1b0-b1af2263a789" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7b0e-9c70-ce2582019b69" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-7b52-a1b0-b1af2263a789" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6d5e-7b19-89c7-203b6af6b472" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7b0e-9c70-ce2582019b69" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6d5e-7b19-89c7-203b6af6b472" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_019e4ba9-6d5e-7d3c-ae15-9297c56950b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_019e4ba9-6d5e-7d3c-ae15-9297c56950b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_019e4ba9-6d5e-7579-9b30-b296e798ec82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_019e4ba9-6d5e-7579-9b30-b296e798ec82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_019e4ba9-6d5e-78af-937b-3593010bb03e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_019e4ba9-6d5e-78af-937b-3593010bb03e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_019e4ba9-6d5e-769f-a039-058e3988473d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_019e4ba9-6d5e-769f-a039-058e3988473d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_019e4ba9-6d5e-7314-98fd-87c823fa2fc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_019e4ba9-6d5e-7314-98fd-87c823fa2fc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_019e4ba9-6d5e-70de-9367-781f3e1b8e37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_019e4ba9-6d5e-724d-9f9a-6c526915ca8c" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_019e4ba9-6d5e-70de-9367-781f3e1b8e37" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofWeightedAverageActuarialAssumptionsUsedtoMeasureNetPeriodicBenefitCostandBenefitObligationsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofWeightedAverageActuarialAssumptionsUsedtoMeasureNetPeriodicBenefitCostandBenefitObligationsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofWeightedAverageActuarialAssumptionsUsedtoMeasureNetPeriodicBenefitCostandBenefitObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-741a-9214-2c59d9300836" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-79b8-b4ba-adf119870570" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-741a-9214-2c59d9300836" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-79b8-b4ba-adf119870570" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7d02-8c61-73fe8315de47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-79b8-b4ba-adf119870570" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7d02-8c61-73fe8315de47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7d02-8c61-73fe8315de47_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7d02-8c61-73fe8315de47" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7d02-8c61-73fe8315de47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7411-adc7-2101b34ec7ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_019e4ba9-6d5e-7d02-8c61-73fe8315de47" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7411-adc7-2101b34ec7ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-71c0-8004-4f5a04d552eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DomesticPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7411-adc7-2101b34ec7ef" xlink:to="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-71c0-8004-4f5a04d552eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e4ba9-6d5e-77e4-b3c5-d951ceb3b1c5" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DomesticPlanMember_019e4ba9-6d5e-71c0-8004-4f5a04d552eb" xlink:to="loc_country_US_019e4ba9-6d5e-77e4-b3c5-d951ceb3b1c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_019e4ba9-6d5e-785a-a8c1-6f88b7661271" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_019e4ba9-6d5e-7411-adc7-2101b34ec7ef" xlink:to="loc_us-gaap_ForeignPlanMember_019e4ba9-6d5e-785a-a8c1-6f88b7661271" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7a0d-8bd9-e90ce0502611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-79b8-b4ba-adf119870570" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7a0d-8bd9-e90ce0502611" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7a0d-8bd9-e90ce0502611_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7a0d-8bd9-e90ce0502611" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7a0d-8bd9-e90ce0502611_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7cd5-91bd-ba044814c795" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-7a0d-8bd9-e90ce0502611" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7cd5-91bd-ba044814c795" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-732d-9170-84f0df60ea7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7cd5-91bd-ba044814c795" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019e4ba9-6d5e-732d-9170-84f0df60ea7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6d5e-75c6-8fc6-01fa60b1726b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-7cd5-91bd-ba044814c795" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6d5e-75c6-8fc6-01fa60b1726b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_019e4ba9-6d5e-71a8-8415-58ecc67705a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-741a-9214-2c59d9300836" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_019e4ba9-6d5e-71a8-8415-58ecc67705a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_019e4ba9-6d5e-7b34-9f2e-18dcce54ac81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_019e4ba9-6d5e-71a8-8415-58ecc67705a1" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_019e4ba9-6d5e-7b34-9f2e-18dcce54ac81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_019e4ba9-6d5e-73e8-a247-258e7e99ffa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_019e4ba9-6d5e-71a8-8415-58ecc67705a1" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_019e4ba9-6d5e-73e8-a247-258e7e99ffa8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_019e4ba9-6d5e-775e-af44-771d21342089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingNetPeriodicBenefitCostAbstract_019e4ba9-6d5e-71a8-8415-58ecc67705a1" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_019e4ba9-6d5e-775e-af44-771d21342089" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_019e4ba9-6d5e-7f1e-849c-a6983aeb83c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-741a-9214-2c59d9300836" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_019e4ba9-6d5e-7f1e-849c-a6983aeb83c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_019e4ba9-6d5e-75ab-ba06-f8e6640fb249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_019e4ba9-6d5e-7f1e-849c-a6983aeb83c3" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_019e4ba9-6d5e-75ab-ba06-f8e6640fb249" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_019e4ba9-6d5e-71c7-a7f9-a61078d7603c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssumptionsUsedInCalculatingBenefitObligationAbstract_019e4ba9-6d5e-7f1e-849c-a6983aeb83c3" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_019e4ba9-6d5e-71c7-a7f9-a61078d7603c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofHealthCareCosttrendRateAssumptionsUsedtoMeasurethePostretirementBenefitObligationsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofHealthCareCosttrendRateAssumptionsUsedtoMeasurethePostretirementBenefitObligationsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofHealthCareCosttrendRateAssumptionsUsedtoMeasurethePostretirementBenefitObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7449-bd6f-fa3dbf1ffe83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7041-acbc-806a28337fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7449-bd6f-fa3dbf1ffe83" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7041-acbc-806a28337fc2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-706a-acee-168c597edcf9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7041-acbc-806a28337fc2" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-706a-acee-168c597edcf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-706a-acee-168c597edcf9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-706a-acee-168c597edcf9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-706a-acee-168c597edcf9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-741a-b0d5-216ad46bad46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019e4ba9-6d5e-706a-acee-168c597edcf9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-741a-b0d5-216ad46bad46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6d5e-7de4-9383-ba529b7c1538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019e4ba9-6d5e-741a-b0d5-216ad46bad46" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019e4ba9-6d5e-7de4-9383-ba529b7c1538" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_019e4ba9-6d5e-7a56-8435-6672ab19cd00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7449-bd6f-fa3dbf1ffe83" xlink:to="loc_us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear_019e4ba9-6d5e-7a56-8435-6672ab19cd00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_019e4ba9-6d5e-7b36-bdd6-5cd65b313682" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7449-bd6f-fa3dbf1ffe83" xlink:to="loc_us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate1_019e4ba9-6d5e-7b36-bdd6-5cd65b313682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate_019e4ba9-6d5e-7589-9fda-764b1ba71a11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7449-bd6f-fa3dbf1ffe83" xlink:to="loc_us-gaap_DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate_019e4ba9-6d5e-7589-9fda-764b1ba71a11" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofWeightedAverageAllocationofMajorityofAssetsRelatedtoDefinedBenefitPlansDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofWeightedAverageAllocationofMajorityofAssetsRelatedtoDefinedBenefitPlansDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofWeightedAverageAllocationofMajorityofAssetsRelatedtoDefinedBenefitPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7aee-a723-220859f16873" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7738-ba8c-4c2e5c101383" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7aee-a723-220859f16873" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7738-ba8c-4c2e5c101383" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-76d7-87c2-c4ba5a06a408" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7738-ba8c-4c2e5c101383" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-76d7-87c2-c4ba5a06a408" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-76d7-87c2-c4ba5a06a408_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-76d7-87c2-c4ba5a06a408" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-76d7-87c2-c4ba5a06a408_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-783e-91b9-b6a8d2373896" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-76d7-87c2-c4ba5a06a408" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-783e-91b9-b6a8d2373896" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_019e4ba9-6d5e-733f-b2a6-86d26c7e3af1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-783e-91b9-b6a8d2373896" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_019e4ba9-6d5e-733f-b2a6-86d26c7e3af1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeSecuritiesMember_019e4ba9-6d5e-75f1-bc5a-f248d6b5a1d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-783e-91b9-b6a8d2373896" xlink:to="loc_us-gaap_FixedIncomeSecuritiesMember_019e4ba9-6d5e-75f1-bc5a-f248d6b5a1d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefinedBenefitPlanAssetCategoriesOtherMember_019e4ba9-6d5e-71aa-b4e8-2c2be4ee7ca3" xlink:href="ph-20260630.xsd#ph_DefinedBenefitPlanAssetCategoriesOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-783e-91b9-b6a8d2373896" xlink:to="loc_ph_DefinedBenefitPlanAssetCategoriesOtherMember_019e4ba9-6d5e-71aa-b4e8-2c2be4ee7ca3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_019e4ba9-6d5e-7df3-a5e0-716410179659" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-7aee-a723-220859f16873" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_019e4ba9-6d5e-7df3-a5e0-716410179659" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofFairValuesofPensionPlanAssetsbyAssetClassDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofFairValuesofPensionPlanAssetsbyAssetClassDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofFairValuesofPensionPlanAssetsbyAssetClassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-782e-af6c-07bd9ff384a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7a0a-ba98-47bfe34ebe82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-782e-af6c-07bd9ff384a2" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7a0a-ba98-47bfe34ebe82" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7e1f-978e-042e62e3c7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7a0a-ba98-47bfe34ebe82" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7e1f-978e-042e62e3c7f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7e1f-978e-042e62e3c7f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7e1f-978e-042e62e3c7f8" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7e1f-978e-042e62e3c7f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7143-a481-755160a799a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7e1f-978e-042e62e3c7f8" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7143-a481-755160a799a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel12And3Member_019e4ba9-6d5e-7e2a-8f8a-e1f64f789e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel12And3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7143-a481-755160a799a3" xlink:to="loc_us-gaap_FairValueInputsLevel12And3Member_019e4ba9-6d5e-7e2a-8f8a-e1f64f789e6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4ba9-6d5e-7dae-9221-3b1e757a82a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e4ba9-6d5e-7e2a-8f8a-e1f64f789e6c" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4ba9-6d5e-7dae-9221-3b1e757a82a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4ba9-6d5e-71f2-a4e0-b52b8115b22e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e4ba9-6d5e-7e2a-8f8a-e1f64f789e6c" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4ba9-6d5e-71f2-a4e0-b52b8115b22e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4ba9-6d5e-756d-9386-725bca31c91a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsLevel12And3Member_019e4ba9-6d5e-7e2a-8f8a-e1f64f789e6c" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4ba9-6d5e-756d-9386-725bca31c91a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e4ba9-6d5e-700a-a10f-2d6601eb4478" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7143-a481-755160a799a3" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019e4ba9-6d5e-700a-a10f-2d6601eb4478" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7450-87e2-c4599ef4f7aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-7a0a-ba98-47bfe34ebe82" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7450-87e2-c4599ef4f7aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7450-87e2-c4599ef4f7aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7450-87e2-c4599ef4f7aa" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-7450-87e2-c4599ef4f7aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_019e4ba9-6d5e-7450-87e2-c4599ef4f7aa" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_019e4ba9-6d5e-7c35-b46d-8072ca1571db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_019e4ba9-6d5e-7c35-b46d-8072ca1571db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember_019e4ba9-6d5e-79e8-a1e5-50e465d5ef16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesUsMember_019e4ba9-6d5e-79e8-a1e5-50e465d5ef16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember_019e4ba9-6d5e-7c83-b49c-0f3ce7ef68d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesNonUsMember_019e4ba9-6d5e-7c83-b49c-0f3ce7ef68d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefinedBenefitPlanCommingledEquityFundsMember_019e4ba9-6d5e-71a7-a469-5e816625c697" xlink:href="ph-20260630.xsd#ph_DefinedBenefitPlanCommingledEquityFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_ph_DefinedBenefitPlanCommingledEquityFundsMember_019e4ba9-6d5e-71a7-a469-5e816625c697" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FixedIncomeSecuritiesCorporateBondsMember_019e4ba9-6d5e-7372-a861-65dc0b3313b4" xlink:href="ph-20260630.xsd#ph_FixedIncomeSecuritiesCorporateBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_ph_FixedIncomeSecuritiesCorporateBondsMember_019e4ba9-6d5e-7372-a861-65dc0b3313b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FixedIncomeSecuritiesIssuedByGovernmentMember_019e4ba9-6d5e-75cd-90f9-5bec4fef4997" xlink:href="ph-20260630.xsd#ph_FixedIncomeSecuritiesIssuedByGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_ph_FixedIncomeSecuritiesIssuedByGovernmentMember_019e4ba9-6d5e-75cd-90f9-5bec4fef4997" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeFundsMember_019e4ba9-6d5e-7d8a-8c04-1edf57291243" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FixedIncomeFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_us-gaap_FixedIncomeFundsMember_019e4ba9-6d5e-7d8a-8c04-1edf57291243" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_AlternativeInvestmentsMember_019e4ba9-6d5e-752e-9b73-3bbf602f6a6f" xlink:href="ph-20260630.xsd#ph_AlternativeInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_ph_AlternativeInvestmentsMember_019e4ba9-6d5e-752e-9b73-3bbf602f6a6f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInsuranceProductLineMember_019e4ba9-6d5e-73f5-a98e-c3503ecd2b42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInsuranceProductLineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_019e4ba9-6d5e-79bd-b006-9864bbdc0d3c" xlink:to="loc_us-gaap_OtherInsuranceProductLineMember_019e4ba9-6d5e-73f5-a98e-c3503ecd2b42" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-75e5-934e-2889445a7698" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-782e-af6c-07bd9ff384a2" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-75e5-934e-2889445a7698" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DefinedBenefitPlanBenefitObligationReceivablesPayables_019e4ba9-6d5e-7261-8512-387bb59f45b3" xlink:href="ph-20260630.xsd#ph_DefinedBenefitPlanBenefitObligationReceivablesPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-782e-af6c-07bd9ff384a2" xlink:to="loc_ph_DefinedBenefitPlanBenefitObligationReceivablesPayables_019e4ba9-6d5e-7261-8512-387bb59f45b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_019e4ba9-6d5e-7b33-90b8-9865058b90b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-782e-af6c-07bd9ff384a2" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_019e4ba9-6d5e-7b33-90b8-9865058b90b4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/RetirementBenefitsScheduleofFairValueMeasurementofPlanAssetsUsingSignificantUnobservableInputsDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#RetirementBenefitsScheduleofFairValueMeasurementofPlanAssetsUsingSignificantUnobservableInputsDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/RetirementBenefitsScheduleofFairValueMeasurementofPlanAssetsUsingSignificantUnobservableInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-725a-806d-3fa4a4ece6cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-78b6-a70f-b7e805289241" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-725a-806d-3fa4a4ece6cd" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-78b6-a70f-b7e805289241" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7f50-8a83-867052ae3d23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019e4ba9-6d5e-78b6-a70f-b7e805289241" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7f50-8a83-867052ae3d23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7f50-8a83-867052ae3d23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7f50-8a83-867052ae3d23" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7f50-8a83-867052ae3d23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7863-9976-dcbec60e7c86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7f50-8a83-867052ae3d23" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7863-9976-dcbec60e7c86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4ba9-6d5e-7558-a8a5-dba0cd466c32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7863-9976-dcbec60e7c86" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4ba9-6d5e-7558-a8a5-dba0cd466c32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019e4ba9-6d5e-725a-806d-3fa4a4ece6cd" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-77ee-9965-2d07a76fe682" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-77ee-9965-2d07a76fe682" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_019e4ba9-6d5e-749d-a75c-a96d104bb789" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_019e4ba9-6d5e-749d-a75c-a96d104bb789" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements_019e4ba9-6d5e-7da8-8302-14b27ec077f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:to="loc_us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements_019e4ba9-6d5e-7da8-8302-14b27ec077f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanTransfersBetweenMeasurementLevels_019e4ba9-6d5e-7aae-a31c-36aa91405409" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanTransfersBetweenMeasurementLevels"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:to="loc_us-gaap_DefinedBenefitPlanTransfersBetweenMeasurementLevels_019e4ba9-6d5e-7aae-a31c-36aa91405409" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_019e4ba9-6d5e-7c4e-bf02-54932702ea94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsLevel3ReconciliationRollForward_019e4ba9-6d5e-7658-8e15-65dbc5edbcba" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_019e4ba9-6d5e-7c4e-bf02-54932702ea94" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_019e4ba9-6d5e-7193-a710-b91f28370a02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/EquityScheduleofChangesinAccumulatedOtherComprehensiveLossinShareholdersEquitybyComponentDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#EquityScheduleofChangesinAccumulatedOtherComprehensiveLossinShareholdersEquitybyComponentDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/EquityScheduleofChangesinAccumulatedOtherComprehensiveLossinShareholdersEquitybyComponentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e4ba9-6d5e-7332-a14b-618e2a3305c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e4ba9-6d5e-715d-ba6d-2b07b09a984c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e4ba9-6d5e-7332-a14b-618e2a3305c9" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e4ba9-6d5e-715d-ba6d-2b07b09a984c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6d5e-7815-a8ec-0ec57ca11277" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e4ba9-6d5e-715d-ba6d-2b07b09a984c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6d5e-7815-a8ec-0ec57ca11277" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4ba9-6d5e-7815-a8ec-0ec57ca11277_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6d5e-7815-a8ec-0ec57ca11277" xlink:to="loc_us-gaap_EquityComponentDomain_019e4ba9-6d5e-7815-a8ec-0ec57ca11277_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4ba9-6d5e-701e-90b5-aacbbd7ac470" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019e4ba9-6d5e-7815-a8ec-0ec57ca11277" xlink:to="loc_us-gaap_EquityComponentDomain_019e4ba9-6d5e-701e-90b5-aacbbd7ac470" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4ba9-6d5e-7872-9d88-cd708c25e9ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4ba9-6d5e-701e-90b5-aacbbd7ac470" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4ba9-6d5e-7872-9d88-cd708c25e9ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_AccumulatedForeignCurrencyandOtherAdjustmentAttributabletoParentMember_019e4ba9-6d5e-7a3a-b811-1cf12259c6d2" xlink:href="ph-20260630.xsd#ph_AccumulatedForeignCurrencyandOtherAdjustmentAttributabletoParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4ba9-6d5e-7872-9d88-cd708c25e9ab" xlink:to="loc_ph_AccumulatedForeignCurrencyandOtherAdjustmentAttributabletoParentMember_019e4ba9-6d5e-7a3a-b811-1cf12259c6d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e4ba9-6d5e-72d7-97e8-bd3a655bbacf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4ba9-6d5e-7872-9d88-cd708c25e9ab" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e4ba9-6d5e-72d7-97e8-bd3a655bbacf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e4ba9-6d5e-7332-a14b-618e2a3305c9" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4ba9-6d5e-79f3-a2f6-beb6531e4cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4ba9-6d5e-79f3-a2f6-beb6531e4cf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019e4ba9-6d5e-7b7c-bf82-fcfce5e5f248" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_019e4ba9-6d5e-7b7c-bf82-fcfce5e5f248" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_019e4ba9-6d5e-788a-acbc-931c648a6666" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_019e4ba9-6d5e-788a-acbc-931c648a6666" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e4ba9-6d5e-779b-bef3-e8c17380f38c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e4ba9-6d5e-779b-bef3-e8c17380f38c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodChangeAbstract_019e4ba9-6d5e-72fa-ae3c-66ebe22dc74f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodChangeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodChangeAbstract_019e4ba9-6d5e-72fa-ae3c-66ebe22dc74f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019e4ba9-6d5e-7c0e-9081-9cbeb2307e75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodChangeAbstract_019e4ba9-6d5e-72fa-ae3c-66ebe22dc74f" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_019e4ba9-6d5e-7c0e-9081-9cbeb2307e75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e4ba9-6d5e-7688-8ae5-565f28a433ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodChangeAbstract_019e4ba9-6d5e-72fa-ae3c-66ebe22dc74f" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019e4ba9-6d5e-7688-8ae5-565f28a433ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e4ba9-6d5e-7490-ae82-d778e1de56a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4ba9-6d5e-717e-b265-6e35ab0b55e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e4ba9-6d5e-7490-ae82-d778e1de56a1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4ba9-6d5e-717e-8c81-59aed44961af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/StockIncentivePlansNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#StockIncentivePlansNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/StockIncentivePlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7619-9614-5d942ceafceb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7619-9614-5d942ceafceb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019e4ba9-6d5e-7664-a3eb-8f3ad37af47e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7619-9614-5d942ceafceb" xlink:to="loc_us-gaap_PlanNameAxis_019e4ba9-6d5e-7664-a3eb-8f3ad37af47e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019e4ba9-6d5e-7664-a3eb-8f3ad37af47e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019e4ba9-6d5e-7664-a3eb-8f3ad37af47e" xlink:to="loc_us-gaap_PlanNameDomain_019e4ba9-6d5e-7664-a3eb-8f3ad37af47e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019e4ba9-6d5e-7510-90ac-823154939e04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019e4ba9-6d5e-7664-a3eb-8f3ad37af47e" xlink:to="loc_us-gaap_PlanNameDomain_019e4ba9-6d5e-7510-90ac-823154939e04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_OmnibusStockIncentivePlan2023Member_019e4ba9-6d5e-73a5-ba0f-6a38965b55b2" xlink:href="ph-20260630.xsd#ph_OmnibusStockIncentivePlan2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019e4ba9-6d5e-7510-90ac-823154939e04" xlink:to="loc_ph_OmnibusStockIncentivePlan2023Member_019e4ba9-6d5e-73a5-ba0f-6a38965b55b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e4ba9-6d5e-70a8-9acf-33eeef517677" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7619-9614-5d942ceafceb" xlink:to="loc_srt_RangeAxis_019e4ba9-6d5e-70a8-9acf-33eeef517677" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6d5e-70a8-9acf-33eeef517677_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e4ba9-6d5e-70a8-9acf-33eeef517677" xlink:to="loc_srt_RangeMember_019e4ba9-6d5e-70a8-9acf-33eeef517677_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6d5e-71d3-8664-c1af9142e11d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e4ba9-6d5e-70a8-9acf-33eeef517677" xlink:to="loc_srt_RangeMember_019e4ba9-6d5e-71d3-8664-c1af9142e11d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e4ba9-6d5e-78c6-9edd-a66b724d4464" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6d5e-71d3-8664-c1af9142e11d" xlink:to="loc_srt_MinimumMember_019e4ba9-6d5e-78c6-9edd-a66b724d4464" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e4ba9-6d5e-7b6c-b02e-2b96f28c1a8a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6d5e-71d3-8664-c1af9142e11d" xlink:to="loc_srt_MaximumMember_019e4ba9-6d5e-7b6c-b02e-2b96f28c1a8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-708a-90a6-ec7583727a83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7619-9614-5d942ceafceb" xlink:to="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-708a-90a6-ec7583727a83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-708a-90a6-ec7583727a83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-708a-90a6-ec7583727a83" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-708a-90a6-ec7583727a83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-70c8-b7e0-ae6a4e2aff1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-708a-90a6-ec7583727a83" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-70c8-b7e0-ae6a4e2aff1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019e4ba9-6d5e-746c-a706-0fff7f6a960a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-70c8-b7e0-ae6a4e2aff1a" xlink:to="loc_us-gaap_EmployeeStockMember_019e4ba9-6d5e-746c-a706-0fff7f6a960a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-7e50-b0c9-6220f3d46ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-70c8-b7e0-ae6a4e2aff1a" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-7e50-b0c9-6220f3d46ccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e4ba9-6d5e-739a-b8dc-b9c3d0b64720" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-70c8-b7e0-ae6a4e2aff1a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e4ba9-6d5e-739a-b8dc-b9c3d0b64720" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_LongTermIncentivePlansMember_019e4ba9-6d5e-7c5a-acbd-f0302fbf6b62" xlink:href="ph-20260630.xsd#ph_LongTermIncentivePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-70c8-b7e0-ae6a4e2aff1a" xlink:to="loc_ph_LongTermIncentivePlansMember_019e4ba9-6d5e-7c5a-acbd-f0302fbf6b62" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019e4ba9-6d5e-7c88-8b2c-11e963aba9cf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7619-9614-5d942ceafceb" xlink:to="loc_srt_TitleOfIndividualAxis_019e4ba9-6d5e-7c88-8b2c-11e963aba9cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e4ba9-6d5e-7c88-8b2c-11e963aba9cf_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019e4ba9-6d5e-7c88-8b2c-11e963aba9cf" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e4ba9-6d5e-7c88-8b2c-11e963aba9cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e4ba9-6d5e-7f7d-888e-f688ec514479" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019e4ba9-6d5e-7c88-8b2c-11e963aba9cf" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e4ba9-6d5e-7f7d-888e-f688ec514479" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_DirectorMember_019e4ba9-6d5e-7991-ab1c-71cbfa730ecc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_DirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019e4ba9-6d5e-7f7d-888e-f688ec514479" xlink:to="loc_srt_DirectorMember_019e4ba9-6d5e-7991-ab1c-71cbfa730ecc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019e4ba9-6d5e-76a4-9ae6-61bd7f6e2977" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_019e4ba9-6d5e-76a4-9ae6-61bd7f6e2977" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019e4ba9-6d5e-7634-b9d2-8ed1a05e29ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_019e4ba9-6d5e-7634-b9d2-8ed1a05e29ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_019e4ba9-6d5e-7c79-ad44-13b91f927202" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_019e4ba9-6d5e-7c79-ad44-13b91f927202" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019e4ba9-6d5e-7783-98d6-15e9d753aa07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019e4ba9-6d5e-7783-98d6-15e9d753aa07" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019e4ba9-6d5e-7be3-bdd6-15c7653b94ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019e4ba9-6d5e-7be3-bdd6-15c7653b94ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_ShareBasedPaymentArrangementAwardsExercisedAndIssuedExpenseTaxBenefit_019e4ba9-6d5e-7978-82d5-0bfe47dcf770" xlink:href="ph-20260630.xsd#ph_ShareBasedPaymentArrangementAwardsExercisedAndIssuedExpenseTaxBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_ph_ShareBasedPaymentArrangementAwardsExercisedAndIssuedExpenseTaxBenefit_019e4ba9-6d5e-7978-82d5-0bfe47dcf770" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e4ba9-6d5e-700f-8b9d-3ea495c42094" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019e4ba9-6d5e-700f-8b9d-3ea495c42094" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019e4ba9-6d5e-7c45-b6a4-3ccac2effa34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019e4ba9-6d5e-7c45-b6a4-3ccac2effa34" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_019e4ba9-6d5e-712f-90e9-97edaa2cd73b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_019e4ba9-6d5e-712f-90e9-97edaa2cd73b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_019e4ba9-6d5e-77bd-953c-a4b8eaca7022" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_019e4ba9-6d5e-77bd-953c-a4b8eaca7022" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetAwardsGrantedPercentage_019e4ba9-6d5e-7f43-a2c2-80e9fc6b4b33" xlink:href="ph-20260630.xsd#ph_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetAwardsGrantedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7ecd-9c24-edf4f0e99144" xlink:to="loc_ph_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetAwardsGrantedPercentage_019e4ba9-6d5e-7f43-a2c2-80e9fc6b4b33" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/StockIncentivePlansScheduleofFairValueofEachSARAwardGrantedUsingaBlackScholesOptionPricingModelDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#StockIncentivePlansScheduleofFairValueofEachSARAwardGrantedUsingaBlackScholesOptionPricingModelDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/StockIncentivePlansScheduleofFairValueofEachSARAwardGrantedUsingaBlackScholesOptionPricingModelDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7701-bcec-7ecf76e01570" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7701-bcec-7ecf76e01570" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7c0b-8be0-9b8004cd2245" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7701-bcec-7ecf76e01570" xlink:to="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7c0b-8be0-9b8004cd2245" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7c0b-8be0-9b8004cd2245_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7c0b-8be0-9b8004cd2245" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7c0b-8be0-9b8004cd2245_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7257-9d93-3ab2a1f4bf6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7c0b-8be0-9b8004cd2245" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7257-9d93-3ab2a1f4bf6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-7eff-9da1-d0a1c5e12a60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7257-9d93-3ab2a1f4bf6b" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-7eff-9da1-d0a1c5e12a60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-710a-9a7b-f194b5b2e881" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-710a-9a7b-f194b5b2e881" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019e4ba9-6d5e-7c92-8fae-92aaaa7c33de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019e4ba9-6d5e-7c92-8fae-92aaaa7c33de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019e4ba9-6d5e-7215-860f-86ac3fb3235c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019e4ba9-6d5e-7215-860f-86ac3fb3235c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019e4ba9-6d5e-7266-8be3-52a12b28e599" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019e4ba9-6d5e-7266-8be3-52a12b28e599" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019e4ba9-6d5e-77c3-b860-6cd284934e52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7e10-b8e9-26db4b7b7623" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019e4ba9-6d5e-77c3-b860-6cd284934e52" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/StockIncentivePlansScheduleofSARActivityDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#StockIncentivePlansScheduleofSARActivityDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/StockIncentivePlansScheduleofSARActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7d0f-9689-1a7153e79113" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-70c2-bf97-a15a7fdd1e51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7d0f-9689-1a7153e79113" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-70c2-bf97-a15a7fdd1e51" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-71a6-8271-07fa2ddad407" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-70c2-bf97-a15a7fdd1e51" xlink:to="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-71a6-8271-07fa2ddad407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-71a6-8271-07fa2ddad407_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-71a6-8271-07fa2ddad407" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-71a6-8271-07fa2ddad407_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-78d5-8ceb-48572157e2cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-71a6-8271-07fa2ddad407" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-78d5-8ceb-48572157e2cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-761e-a827-e4f982ae7a59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-78d5-8ceb-48572157e2cf" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-761e-a827-e4f982ae7a59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7d0f-9689-1a7153e79113" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019e4ba9-6d5e-76ff-97ef-30e142bc7964" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019e4ba9-6d5e-76ff-97ef-30e142bc7964" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019e4ba9-6d5e-79cd-8310-53c2ce21cea0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019e4ba9-6d5e-79cd-8310-53c2ce21cea0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019e4ba9-6d5e-74fa-99a2-3d0177e29b01" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019e4ba9-6d5e-74fa-99a2-3d0177e29b01" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_019e4ba9-6d5e-7a3f-b8c6-3b3a7eff4c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_019e4ba9-6d5e-7a3f-b8c6-3b3a7eff4c1e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019e4ba9-6d5e-7b5a-bb8e-a16ce1a57b03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019e4ba9-6d5e-7b5e-a153-ea606e69eef5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019e4ba9-6d5e-7ae6-948f-eaee3c1db250" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019e4ba9-6d5e-7b5e-a153-ea606e69eef5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7d0f-9689-1a7153e79113" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019e4ba9-6d5e-7631-8dae-b3333105c05d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019e4ba9-6d5e-7631-8dae-b3333105c05d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_019e4ba9-6d5e-7440-93bc-6464e0dfced6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_019e4ba9-6d5e-7440-93bc-6464e0dfced6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019e4ba9-6d5e-71b6-9d9d-56a19ba1a48c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019e4ba9-6d5e-71b6-9d9d-56a19ba1a48c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_019e4ba9-6d5e-7fe7-867e-1c9fcde3e54e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_019e4ba9-6d5e-7fe7-867e-1c9fcde3e54e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019e4ba9-6d5e-70c4-b884-2dd4ef17b772" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_019e4ba9-6d5e-7c9b-92b5-1b443a69d72a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019e4ba9-6d5e-7ba1-8533-1188d0e1ec12" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_019e4ba9-6d5e-7c9b-92b5-1b443a69d72a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019e4ba9-6d5e-721e-951c-683c33c5bec9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7d0f-9689-1a7153e79113" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019e4ba9-6d5e-721e-951c-683c33c5bec9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_019e4ba9-6d5e-71ae-bda3-1a7aa999dec5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019e4ba9-6d5e-721e-951c-683c33c5bec9" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_019e4ba9-6d5e-71ae-bda3-1a7aa999dec5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_019e4ba9-6d5e-75e1-8cb1-f940e8a76839" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019e4ba9-6d5e-721e-951c-683c33c5bec9" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_019e4ba9-6d5e-75e1-8cb1-f940e8a76839" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_019e4ba9-6d5e-752c-a95b-dffb6cd68402" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019e4ba9-6d5e-721e-951c-683c33c5bec9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_019e4ba9-6d5e-752c-a95b-dffb6cd68402" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_019e4ba9-6d5e-7a8e-9a09-b9f2efb138b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019e4ba9-6d5e-721e-951c-683c33c5bec9" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_019e4ba9-6d5e-7a8e-9a09-b9f2efb138b9" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/StockIncentivePlansScheduleofStatusandChangesofSharesSubjecttoRSUAwardsandRelatedAveragePricePerShareDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#StockIncentivePlansScheduleofStatusandChangesofSharesSubjecttoRSUAwardsandRelatedAveragePricePerShareDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/StockIncentivePlansScheduleofStatusandChangesofSharesSubjecttoRSUAwardsandRelatedAveragePricePerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7bda-bd55-7bf46595dab9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7e03-a084-8bd9f486a1b2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7bda-bd55-7bf46595dab9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7e03-a084-8bd9f486a1b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7259-8328-e1cb8e694335" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7e03-a084-8bd9f486a1b2" xlink:to="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7259-8328-e1cb8e694335" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7259-8328-e1cb8e694335_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7259-8328-e1cb8e694335" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7259-8328-e1cb8e694335_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-71ef-bc8e-a7f3e4ad1cff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7259-8328-e1cb8e694335" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-71ef-bc8e-a7f3e4ad1cff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-7bb1-91fc-31478b7a5796" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-71ef-bc8e-a7f3e4ad1cff" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_019e4ba9-6d5e-7bb1-91fc-31478b7a5796" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7684-9b38-4234f79b1285" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7bda-bd55-7bf46595dab9" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7684-9b38-4234f79b1285" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_019e4ba9-6d5e-7057-acd4-37bebcf187e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7684-9b38-4234f79b1285" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_019e4ba9-6d5e-7057-acd4-37bebcf187e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019e4ba9-6d5e-7a47-a4d3-1ed189d7074a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7684-9b38-4234f79b1285" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019e4ba9-6d5e-7a47-a4d3-1ed189d7074a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_019e4ba9-6d5e-76a4-b5e5-98892df98b33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7684-9b38-4234f79b1285" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares_019e4ba9-6d5e-76a4-b5e5-98892df98b33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_019e4ba9-6d5e-7eda-b3b3-04580342df5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7684-9b38-4234f79b1285" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_019e4ba9-6d5e-7eda-b3b3-04580342df5a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_019e4ba9-6d5e-7e97-848c-386f80a4e6c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-7f3b-b6de-9c7aa554e381" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7bda-bd55-7bf46595dab9" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-7f3b-b6de-9c7aa554e381" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7fa1-a4ec-6c003d76db93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-7f3b-b6de-9c7aa554e381" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7fa1-a4ec-6c003d76db93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-789f-ae67-4d87559b795d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-7f3b-b6de-9c7aa554e381" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-789f-ae67-4d87559b795d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7a6b-9a04-21bb7e44cd8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-7f3b-b6de-9c7aa554e381" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7a6b-9a04-21bb7e44cd8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7a53-b184-a8f75f595ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-7f3b-b6de-9c7aa554e381" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7a53-b184-a8f75f595ea0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7bc2-8bc8-8d8509169bfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/StockIncentivePlansScheduleofStatusandChangesofSharesSubjecttoRSUandLTIPAwardsforEmployeesandRelatedAveragePricePerShareDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#StockIncentivePlansScheduleofStatusandChangesofSharesSubjecttoRSUandLTIPAwardsforEmployeesandRelatedAveragePricePerShareDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/StockIncentivePlansScheduleofStatusandChangesofSharesSubjecttoRSUandLTIPAwardsforEmployeesandRelatedAveragePricePerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7c9f-9a16-1ac720269de2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7286-a7bb-0318b6a12ffe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7c9f-9a16-1ac720269de2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7286-a7bb-0318b6a12ffe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7aec-b2ca-8e88e275315b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-7286-a7bb-0318b6a12ffe" xlink:to="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7aec-b2ca-8e88e275315b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7aec-b2ca-8e88e275315b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7aec-b2ca-8e88e275315b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7aec-b2ca-8e88e275315b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-769f-983c-00e7ffed824d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-7aec-b2ca-8e88e275315b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-769f-983c-00e7ffed824d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e4ba9-6d5e-7f2f-a0ee-c2325da46aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-769f-983c-00e7ffed824d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e4ba9-6d5e-7f2f-a0ee-c2325da46aa8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_LongTermIncentivePlansMember_019e4ba9-6d5e-71f2-98f9-5b3d393f20f0" xlink:href="ph-20260630.xsd#ph_LongTermIncentivePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-769f-983c-00e7ffed824d" xlink:to="loc_ph_LongTermIncentivePlansMember_019e4ba9-6d5e-71f2-98f9-5b3d393f20f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7491-8ea7-51fe9a7cdf34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7c9f-9a16-1ac720269de2" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7491-8ea7-51fe9a7cdf34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e4ba9-6d5e-799c-915e-a200a4563556" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7491-8ea7-51fe9a7cdf34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e4ba9-6d5e-799c-915e-a200a4563556" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e4ba9-6d5e-7e05-bedd-6ce80ac6a03c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7491-8ea7-51fe9a7cdf34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019e4ba9-6d5e-7e05-bedd-6ce80ac6a03c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019e4ba9-6d5e-78dd-9e39-1337846701e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7491-8ea7-51fe9a7cdf34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019e4ba9-6d5e-78dd-9e39-1337846701e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019e4ba9-6d5e-7bd6-8eff-cc6cbe5099fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_019e4ba9-6d5e-7491-8ea7-51fe9a7cdf34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019e4ba9-6d5e-7bd6-8eff-cc6cbe5099fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019e4ba9-6d5e-7049-b920-a1145246485d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-76e3-bc12-7a131e06bd09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-7c9f-9a16-1ac720269de2" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-76e3-bc12-7a131e06bd09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-737d-972d-ea69737d323c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-76e3-bc12-7a131e06bd09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-737d-972d-ea69737d323c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-73ed-b4d1-cd6899356a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-76e3-bc12-7a131e06bd09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-73ed-b4d1-cd6899356a7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7f87-9674-38a2fae86c3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-76e3-bc12-7a131e06bd09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7f87-9674-38a2fae86c3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7127-ac4e-0a55b7a538b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_019e4ba9-6d5e-76e3-bc12-7a131e06bd09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7127-ac4e-0a55b7a538b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7b16-8dcc-e5ae4707cb31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/StockIncentivePlansScheduleofFairValueInformationDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#StockIncentivePlansScheduleofFairValueInformationDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/StockIncentivePlansScheduleofFairValueInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-77c1-8244-e47b86a0bd5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-76de-9375-a8fcc296b6c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-77c1-8244-e47b86a0bd5d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-76de-9375-a8fcc296b6c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-792a-a73b-684abb5866a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019e4ba9-6d5e-76de-9375-a8fcc296b6c6" xlink:to="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-792a-a73b-684abb5866a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-792a-a73b-684abb5866a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-792a-a73b-684abb5866a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-792a-a73b-684abb5866a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7037-808c-0b7206607743" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019e4ba9-6d5e-792a-a73b-684abb5866a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7037-808c-0b7206607743" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019e4ba9-6d5e-75b0-ad8c-8bfa6203de50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7037-808c-0b7206607743" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019e4ba9-6d5e-75b0-ad8c-8bfa6203de50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_LongTermIncentivePlansMember_019e4ba9-6d5e-739d-b35e-21b280361bb3" xlink:href="ph-20260630.xsd#ph_LongTermIncentivePlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019e4ba9-6d5e-7037-808c-0b7206607743" xlink:to="loc_ph_LongTermIncentivePlansMember_019e4ba9-6d5e-739d-b35e-21b280361bb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_019e4ba9-6d5e-706b-b6a2-5c461109f648" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-77c1-8244-e47b86a0bd5d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_019e4ba9-6d5e-706b-b6a2-5c461109f648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7f22-bf41-49679f286f45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019e4ba9-6d5e-77c1-8244-e47b86a0bd5d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019e4ba9-6d5e-7f22-bf41-49679f286f45" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#FinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7e5b-bfa7-e4eb47b8d968" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-77e1-adec-fc21055f61a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7e5b-bfa7-e4eb47b8d968" xlink:to="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-77e1-adec-fc21055f61a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-72e6-8198-44994565b0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-77e1-adec-fc21055f61a7" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-72e6-8198-44994565b0dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-72e6-8198-44994565b0dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-72e6-8198-44994565b0dc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-72e6-8198-44994565b0dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-73f2-8473-d14a5b37c022" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-72e6-8198-44994565b0dc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-73f2-8473-d14a5b37c022" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7444-bbb0-56584cb8a23f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-73f2-8473-d14a5b37c022" xlink:to="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7444-bbb0-56584cb8a23f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CurrencySwapOneMember_019e4ba9-6d5e-76e8-98e0-0eabdc88e1de" xlink:href="ph-20260630.xsd#ph_CurrencySwapOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7444-bbb0-56584cb8a23f" xlink:to="loc_ph_CurrencySwapOneMember_019e4ba9-6d5e-76e8-98e0-0eabdc88e1de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_CurrencySwapTwoMember_019e4ba9-6d5e-7b4f-9c09-07b5de61e3e9" xlink:href="ph-20260630.xsd#ph_CurrencySwapTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7444-bbb0-56584cb8a23f" xlink:to="loc_ph_CurrencySwapTwoMember_019e4ba9-6d5e-7b4f-9c09-07b5de61e3e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6d5e-7b74-ad8f-7a07ac2a1ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-77e1-adec-fc21055f61a7" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6d5e-7b74-ad8f-7a07ac2a1ec7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6d5e-7b74-ad8f-7a07ac2a1ec7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6d5e-7b74-ad8f-7a07ac2a1ec7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6d5e-7b74-ad8f-7a07ac2a1ec7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6d5e-721a-9fe3-fb27a09acb13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e4ba9-6d5e-7b74-ad8f-7a07ac2a1ec7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6d5e-721a-9fe3-fb27a09acb13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_A2.90SeniorNotesDue2030Member_019e4ba9-6d5e-7355-a179-8bba041bbc5a" xlink:href="ph-20260630.xsd#ph_A2.90SeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e4ba9-6d5e-721a-9fe3-fb27a09acb13" xlink:to="loc_ph_A2.90SeniorNotesDue2030Member_019e4ba9-6d5e-7355-a179-8bba041bbc5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6d5e-75fd-bedb-50800c239643" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-77e1-adec-fc21055f61a7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6d5e-75fd-bedb-50800c239643" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6d5e-75fd-bedb-50800c239643_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6d5e-75fd-bedb-50800c239643" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6d5e-75fd-bedb-50800c239643_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6d5e-707c-984d-f84160471afa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e4ba9-6d5e-75fd-bedb-50800c239643" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6d5e-707c-984d-f84160471afa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019e4ba9-6d5e-7fc8-a2c8-da0eed99b1d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e4ba9-6d5e-707c-984d-f84160471afa" xlink:to="loc_us-gaap_SeniorNotesMember_019e4ba9-6d5e-7fc8-a2c8-da0eed99b1d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e4ba9-6d5e-75d0-8096-0ab1a9d21f43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7e5b-bfa7-e4eb47b8d968" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e4ba9-6d5e-75d0-8096-0ab1a9d21f43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e4ba9-6d5e-792f-8451-f32b2ef9c388" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7e5b-bfa7-e4eb47b8d968" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e4ba9-6d5e-792f-8451-f32b2ef9c388" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e4ba9-6d5e-7344-85bd-a01f0535eae0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7e5b-bfa7-e4eb47b8d968" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e4ba9-6d5e-7344-85bd-a01f0535eae0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofLocationandFairValueofDerivativeFinancialInstrumentsReportedonConsolidatedBalanceSheetDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#FinancialInstrumentsScheduleofLocationandFairValueofDerivativeFinancialInstrumentsReportedonConsolidatedBalanceSheetDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofLocationandFairValueofDerivativeFinancialInstrumentsReportedonConsolidatedBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019e4ba9-6d5e-7439-bf9c-ad8033c4addb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e4ba9-6d5e-7af9-873b-fee145466b4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e4ba9-6d5e-7439-bf9c-ad8033c4addb" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e4ba9-6d5e-7af9-873b-fee145466b4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7fe2-92f3-003d14ea9d98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e4ba9-6d5e-7af9-873b-fee145466b4a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7fe2-92f3-003d14ea9d98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7fe2-92f3-003d14ea9d98_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7fe2-92f3-003d14ea9d98" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7fe2-92f3-003d14ea9d98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7f17-b327-b68387ab58ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7fe2-92f3-003d14ea9d98" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7f17-b327-b68387ab58ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7efe-821f-ee0307eb8903" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7f17-b327-b68387ab58ab" xlink:to="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7efe-821f-ee0307eb8903" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_019e4ba9-6d5e-7242-a766-be827d59b768" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7f17-b327-b68387ab58ab" xlink:to="loc_us-gaap_ForwardContractsMember_019e4ba9-6d5e-7242-a766-be827d59b768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgeDerivativesAtFairValueNetTotalAbstract_019e4ba9-6d5e-7993-91cf-f4f521ff963e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgeDerivativesAtFairValueNetTotalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e4ba9-6d5e-7439-bf9c-ad8033c4addb" xlink:to="loc_us-gaap_NetInvestmentHedgeDerivativesAtFairValueNetTotalAbstract_019e4ba9-6d5e-7993-91cf-f4f521ff963e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgeDerivativeAssetsAtFairValue_019e4ba9-6d5e-71c2-bdd9-15914fe17ba3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgeDerivativeAssetsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetInvestmentHedgeDerivativesAtFairValueNetTotalAbstract_019e4ba9-6d5e-7993-91cf-f4f521ff963e" xlink:to="loc_us-gaap_NetInvestmentHedgeDerivativeAssetsAtFairValue_019e4ba9-6d5e-71c2-bdd9-15914fe17ba3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue_019e4ba9-6d5e-7fb7-9318-a027e79e8875" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetInvestmentHedgeDerivativesAtFairValueNetTotalAbstract_019e4ba9-6d5e-7993-91cf-f4f521ff963e" xlink:to="loc_us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue_019e4ba9-6d5e-7fb7-9318-a027e79e8875" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_019e4ba9-6d5e-7910-a88c-e215b0b97596" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e4ba9-6d5e-7439-bf9c-ad8033c4addb" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_019e4ba9-6d5e-7910-a88c-e215b0b97596" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_019e4ba9-6d5e-73f4-948f-655e54c0c984" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_019e4ba9-6d5e-7910-a88c-e215b0b97596" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_019e4ba9-6d5e-73f4-948f-655e54c0c984" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_019e4ba9-6d5e-752a-b0da-7845940f5660" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAbstract_019e4ba9-6d5e-7910-a88c-e215b0b97596" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_019e4ba9-6d5e-752a-b0da-7845940f5660" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofGainslossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementofIncomeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#FinancialInstrumentsScheduleofGainslossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementofIncomeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofGainslossesonDerivativeFinancialInstrumentsRecordedinConsolidatedStatementofIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7401-97fc-76ec47d009e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-71d5-b39f-0ada1a5cee6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7401-97fc-76ec47d009e2" xlink:to="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-71d5-b39f-0ada1a5cee6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7e30-b781-2de12d9d16fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e4ba9-6d5e-71d5-b39f-0ada1a5cee6b" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7e30-b781-2de12d9d16fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7e30-b781-2de12d9d16fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7e30-b781-2de12d9d16fd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7e30-b781-2de12d9d16fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7eac-90ac-811888e70e94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7e30-b781-2de12d9d16fd" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7eac-90ac-811888e70e94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForwardContractsMember_019e4ba9-6d5e-7d71-8d61-32ed7803e786" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForwardContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7eac-90ac-811888e70e94" xlink:to="loc_us-gaap_ForwardContractsMember_019e4ba9-6d5e-7d71-8d61-32ed7803e786" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019e4ba9-6d5e-7e84-a3ea-f6b825c155db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4ba9-6d5e-7401-97fc-76ec47d009e2" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019e4ba9-6d5e-7e84-a3ea-f6b825c155db" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofGainsLossesonDerivativeandNonDerivativeFinancialInstrumentsRecordedinAccumulatedOtherComprehensiveLossDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#FinancialInstrumentsScheduleofGainsLossesonDerivativeandNonDerivativeFinancialInstrumentsRecordedinAccumulatedOtherComprehensiveLossDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofGainsLossesonDerivativeandNonDerivativeFinancialInstrumentsRecordedinAccumulatedOtherComprehensiveLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4ba9-6d5e-7530-9de1-2d30fc65eda2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4ba9-6d5e-756c-b6b8-9ff32c648181" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4ba9-6d5e-7530-9de1-2d30fc65eda2" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4ba9-6d5e-756c-b6b8-9ff32c648181" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7f70-a333-82c9ee489184" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4ba9-6d5e-756c-b6b8-9ff32c648181" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7f70-a333-82c9ee489184" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7f70-a333-82c9ee489184_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7f70-a333-82c9ee489184" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-7f70-a333-82c9ee489184_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-715f-8c38-879ae5900486" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4ba9-6d5e-7f70-a333-82c9ee489184" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-715f-8c38-879ae5900486" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7877-8fea-1f44767886f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-715f-8c38-879ae5900486" xlink:to="loc_us-gaap_CurrencySwapMember_019e4ba9-6d5e-7877-8fea-1f44767886f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_ForeignCurrencyDenominatedDebtMember_019e4ba9-6d5e-7313-9c07-651e516e2c90" xlink:href="ph-20260630.xsd#ph_ForeignCurrencyDenominatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4ba9-6d5e-715f-8c38-879ae5900486" xlink:to="loc_ph_ForeignCurrencyDenominatedDebtMember_019e4ba9-6d5e-7313-9c07-651e516e2c90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e4ba9-6d5e-7edf-820e-248dfaa45fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4ba9-6d5e-756c-b6b8-9ff32c648181" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e4ba9-6d5e-7edf-820e-248dfaa45fcf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4ba9-6d5e-7edf-820e-248dfaa45fcf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e4ba9-6d5e-7edf-820e-248dfaa45fcf" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4ba9-6d5e-7edf-820e-248dfaa45fcf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4ba9-6d5e-719b-b766-bf71f695c67f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019e4ba9-6d5e-7edf-820e-248dfaa45fcf" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4ba9-6d5e-719b-b766-bf71f695c67f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4ba9-6d5e-7431-9bc8-bd9f18ab8721" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e4ba9-6d5e-719b-b766-bf71f695c67f" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4ba9-6d5e-7431-9bc8-bd9f18ab8721" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DerivativeAndNonDerivativeInstrumentsGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLoss_019e4ba9-6d5e-7a3a-932c-8bf25f399696" xlink:href="ph-20260630.xsd#ph_DerivativeAndNonDerivativeInstrumentsGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4ba9-6d5e-7530-9de1-2d30fc65eda2" xlink:to="loc_ph_DerivativeAndNonDerivativeInstrumentsGainLossRecognizedInAccumulatedOtherComprehensiveIncomeLoss_019e4ba9-6d5e-7a3a-932c-8bf25f399696" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofCarryingValueandEstimatedFairValueofLongTermDebtDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#FinancialInstrumentsScheduleofCarryingValueandEstimatedFairValueofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofCarryingValueandEstimatedFairValueofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e4ba9-6d5e-7ba6-aebb-b7849db6dbdb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e4ba9-6d5e-786b-993d-6a1ea622e0ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e4ba9-6d5e-7ba6-aebb-b7849db6dbdb" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e4ba9-6d5e-786b-993d-6a1ea622e0ba" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019e4ba9-6d5e-7c36-b9c2-5050b82200fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e4ba9-6d5e-786b-993d-6a1ea622e0ba" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019e4ba9-6d5e-7c36-b9c2-5050b82200fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4ba9-6d5e-7c36-b9c2-5050b82200fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e4ba9-6d5e-7c36-b9c2-5050b82200fe" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4ba9-6d5e-7c36-b9c2-5050b82200fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e4ba9-6d5e-729f-8dfd-f7e47c578a11" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019e4ba9-6d5e-7c36-b9c2-5050b82200fe" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e4ba9-6d5e-729f-8dfd-f7e47c578a11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4ba9-6d5e-7969-8290-b1cda7959d83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e4ba9-6d5e-729f-8dfd-f7e47c578a11" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4ba9-6d5e-7969-8290-b1cda7959d83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e4ba9-6d5e-7c76-aaab-31341120e878" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4ba9-6d5e-7969-8290-b1cda7959d83" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e4ba9-6d5e-7c76-aaab-31341120e878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e4ba9-6d5e-702e-acc3-1702a794d055" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4ba9-6d5e-7969-8290-b1cda7959d83" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e4ba9-6d5e-702e-acc3-1702a794d055" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019e4ba9-6d5e-7583-a488-87fa62e023c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e4ba9-6d5e-7ba6-aebb-b7849db6dbdb" xlink:to="loc_us-gaap_LongTermDebtFairValue_019e4ba9-6d5e-7583-a488-87fa62e023c3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#FinancialInstrumentsScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/FinancialInstrumentsScheduleofFinancialAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4ba9-6d5e-79e9-b91f-cd4a9382595d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e4ba9-6d5e-7f2e-aff0-b7c4f9393748" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4ba9-6d5e-79e9-b91f-cd4a9382595d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e4ba9-6d5e-7f2e-aff0-b7c4f9393748" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7044-b260-a2235581b911" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e4ba9-6d5e-7f2e-aff0-b7c4f9393748" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7044-b260-a2235581b911" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7044-b260-a2235581b911_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7044-b260-a2235581b911" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7044-b260-a2235581b911_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7ebd-b7ae-22c5983ca8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4ba9-6d5e-7044-b260-a2235581b911" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7ebd-b7ae-22c5983ca8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4ba9-6d5e-7ee7-ac88-8992ead1c32c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7ebd-b7ae-22c5983ca8a7" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4ba9-6d5e-7ee7-ac88-8992ead1c32c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4ba9-6d5e-774b-9883-5c9c5837783b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7ebd-b7ae-22c5983ca8a7" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4ba9-6d5e-774b-9883-5c9c5837783b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4ba9-6d5e-727c-86dc-b6e0e8b18927" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4ba9-6d5e-7ebd-b7ae-22c5983ca8a7" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4ba9-6d5e-727c-86dc-b6e0e8b18927" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019e4ba9-6d5e-78ec-be52-12993a2a17d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4ba9-6d5e-79e9-b91f-cd4a9382595d" xlink:to="loc_us-gaap_DerivativeAssets_019e4ba9-6d5e-78ec-be52-12993a2a17d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019f618c-64e9-78eb-b11b-ab6c5d26506b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssets_019e4ba9-6d5e-78ec-be52-12993a2a17d5" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019f618c-64e9-78eb-b11b-ab6c5d26506b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019e4ba9-6d5e-7e02-8fa9-2ada45a9abf9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4ba9-6d5e-79e9-b91f-cd4a9382595d" xlink:to="loc_us-gaap_DerivativeLiabilities_019e4ba9-6d5e-7e02-8fa9-2ada45a9abf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019f618c-64e9-7158-bc60-4eef88812df2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilities_019e4ba9-6d5e-7e02-8fa9-2ada45a9abf9" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019f618c-64e9-7158-bc60-4eef88812df2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/ContingenciesDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#ContingenciesDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/ContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019e4ba9-6d5e-74a6-8c83-959d064fe96e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019e4ba9-6d5e-796a-a10a-214445794872" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4ba9-6d5e-74a6-8c83-959d064fe96e" xlink:to="loc_us-gaap_LossContingenciesTable_019e4ba9-6d5e-796a-a10a-214445794872" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e4ba9-6d5e-79cf-8c17-439bd8b9bf09" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e4ba9-6d5e-796a-a10a-214445794872" xlink:to="loc_srt_RangeAxis_019e4ba9-6d5e-79cf-8c17-439bd8b9bf09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6d5e-79cf-8c17-439bd8b9bf09_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e4ba9-6d5e-79cf-8c17-439bd8b9bf09" xlink:to="loc_srt_RangeMember_019e4ba9-6d5e-79cf-8c17-439bd8b9bf09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e4ba9-6d5e-7e7f-9a74-ffd34cf6a0d2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e4ba9-6d5e-79cf-8c17-439bd8b9bf09" xlink:to="loc_srt_RangeMember_019e4ba9-6d5e-7e7f-9a74-ffd34cf6a0d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e4ba9-6d5e-7e80-b012-d9142bb606c1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6d5e-7e7f-9a74-ffd34cf6a0d2" xlink:to="loc_srt_MinimumMember_019e4ba9-6d5e-7e80-b012-d9142bb606c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e4ba9-6d5e-7f59-becc-ab0db847066e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e4ba9-6d5e-7e7f-9a74-ffd34cf6a0d2" xlink:to="loc_srt_MaximumMember_019e4ba9-6d5e-7f59-becc-ab0db847066e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e4ba9-6d5e-7ea4-b0a0-9b2497ceb496" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e4ba9-6d5e-796a-a10a-214445794872" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e4ba9-6d5e-7ea4-b0a0-9b2497ceb496" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019e4ba9-6d5e-7ea4-b0a0-9b2497ceb496_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e4ba9-6d5e-7ea4-b0a0-9b2497ceb496" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019e4ba9-6d5e-7ea4-b0a0-9b2497ceb496_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019e4ba9-6d5e-79f5-a10b-305e8d0adbd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e4ba9-6d5e-7ea4-b0a0-9b2497ceb496" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019e4ba9-6d5e-79f5-a10b-305e8d0adbd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalIssueMember_019e4ba9-6d5e-7659-a909-51ecda026539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalIssueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019e4ba9-6d5e-79f5-a10b-305e8d0adbd8" xlink:to="loc_us-gaap_EnvironmentalIssueMember_019e4ba9-6d5e-7659-a909-51ecda026539" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_019e4ba9-6d5e-71d7-8bc8-766bdd99c626" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccrualForEnvironmentalLossContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4ba9-6d5e-74a6-8c83-959d064fe96e" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_019e4ba9-6d5e-71d7-8bc8-766bdd99c626" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag_019e4ba9-6d5e-7cde-bbda-03b613339641" xlink:href="ph-20260630.xsd#ph_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4ba9-6d5e-74a6-8c83-959d064fe96e" xlink:to="loc_ph_EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag_019e4ba9-6d5e-7cde-bbda-03b613339641" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_019e4ba9-6d5e-7023-82d7-80c6c9db2e18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4ba9-6d5e-74a6-8c83-959d064fe96e" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_019e4ba9-6d5e-7023-82d7-80c6c9db2e18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_LossContingencyLargestRangeOfLossInPeriod_019e4ba9-6d5e-746a-99a3-752a2ae66d66" xlink:href="ph-20260630.xsd#ph_LossContingencyLargestRangeOfLossInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4ba9-6d5e-74a6-8c83-959d064fe96e" xlink:to="loc_ph_LossContingencyLargestRangeOfLossInPeriod_019e4ba9-6d5e-746a-99a3-752a2ae66d66" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/BusinessSegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#BusinessSegmentInformationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/BusinessSegmentInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77a5-a751-99694c1c56f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4ba9-6d5e-7501-b3e6-3ebe7ecfa5e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77a5-a751-99694c1c56f8" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4ba9-6d5e-7501-b3e6-3ebe7ecfa5e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-71e4-82a8-1ada1763aa32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4ba9-6d5e-7501-b3e6-3ebe7ecfa5e3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-71e4-82a8-1ada1763aa32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-71e4-82a8-1ada1763aa32_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-71e4-82a8-1ada1763aa32" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-71e4-82a8-1ada1763aa32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-7bce-9981-a16f93ba539e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-71e4-82a8-1ada1763aa32" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-7bce-9981-a16f93ba539e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6d5e-7ee1-8e88-01706356b94f" xlink:href="ph-20260630.xsd#ph_DiversifiedIndustrialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-7bce-9981-a16f93ba539e" xlink:to="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6d5e-7ee1-8e88-01706356b94f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019e4ba9-6d5e-74f0-8c02-97e8168f5254" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4ba9-6d5e-7501-b3e6-3ebe7ecfa5e3" xlink:to="loc_us-gaap_SubsegmentsAxis_019e4ba9-6d5e-74f0-8c02-97e8168f5254" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e4ba9-6d5e-74f0-8c02-97e8168f5254_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019e4ba9-6d5e-74f0-8c02-97e8168f5254" xlink:to="loc_us-gaap_SubsegmentsDomain_019e4ba9-6d5e-74f0-8c02-97e8168f5254_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019e4ba9-6d5e-79c4-a195-1a3ad2942a90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019e4ba9-6d5e-74f0-8c02-97e8168f5254" xlink:to="loc_us-gaap_SubsegmentsDomain_019e4ba9-6d5e-79c4-a195-1a3ad2942a90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_InternationalOperationsMember_019e4ba9-6d5e-7dd2-a772-a22341a75394" xlink:href="ph-20260630.xsd#ph_InternationalOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019e4ba9-6d5e-79c4-a195-1a3ad2942a90" xlink:to="loc_ph_InternationalOperationsMember_019e4ba9-6d5e-7dd2-a772-a22341a75394" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019e4ba9-6d5e-7ef9-ba52-1fa29ad8fbbe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77a5-a751-99694c1c56f8" xlink:to="loc_us-gaap_NumberOfReportableSegments_019e4ba9-6d5e-7ef9-ba52-1fa29ad8fbbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_019e4ba9-6d5e-760a-be2a-552351c536c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77a5-a751-99694c1c56f8" xlink:to="loc_us-gaap_NumberOfOperatingSegments_019e4ba9-6d5e-760a-be2a-552351c536c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_NumberOfCoreTechnologiesUtilized_019e4ba9-6d5e-7d98-9f79-7d99320f8c0e" xlink:href="ph-20260630.xsd#ph_NumberOfCoreTechnologiesUtilized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77a5-a751-99694c1c56f8" xlink:to="loc_ph_NumberOfCoreTechnologiesUtilized_019e4ba9-6d5e-7d98-9f79-7d99320f8c0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_019e4ba9-6d5e-7704-be59-cf55237d1130" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfCountriesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77a5-a751-99694c1c56f8" xlink:to="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_019e4ba9-6d5e-7704-be59-cf55237d1130" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/BusinessSegmentInformationScheduleofBusinessSegmentInformationDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#BusinessSegmentInformationScheduleofBusinessSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/BusinessSegmentInformationScheduleofBusinessSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e4ba9-6d5e-7983-8132-3d21a561d4c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e4ba9-6d5e-7983-8132-3d21a561d4c4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e4ba9-6d5e-7709-8fab-2ec35fe01288" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e4ba9-6d5e-7983-8132-3d21a561d4c4" xlink:to="loc_srt_ConsolidationItemsAxis_019e4ba9-6d5e-7709-8fab-2ec35fe01288" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4ba9-6d5e-7709-8fab-2ec35fe01288_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e4ba9-6d5e-7709-8fab-2ec35fe01288" xlink:to="loc_srt_ConsolidationItemsDomain_019e4ba9-6d5e-7709-8fab-2ec35fe01288_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4ba9-6d5e-7acb-96f4-c70b764858e3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e4ba9-6d5e-7709-8fab-2ec35fe01288" xlink:to="loc_srt_ConsolidationItemsDomain_019e4ba9-6d5e-7acb-96f4-c70b764858e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e4ba9-6d5e-7338-acb1-413dc5dfc54a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4ba9-6d5e-7acb-96f4-c70b764858e3" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e4ba9-6d5e-7338-acb1-413dc5dfc54a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e4ba9-6d5e-7753-8fe5-35c482cf116b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4ba9-6d5e-7acb-96f4-c70b764858e3" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e4ba9-6d5e-7753-8fe5-35c482cf116b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-70e7-92fd-ba12499e1188" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e4ba9-6d5e-7983-8132-3d21a561d4c4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-70e7-92fd-ba12499e1188" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-70e7-92fd-ba12499e1188_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-70e7-92fd-ba12499e1188" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-70e7-92fd-ba12499e1188_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-757a-a485-d846fb0f7aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019e4ba9-6d5e-70e7-92fd-ba12499e1188" xlink:to="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-757a-a485-d846fb0f7aa8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6d5e-7a23-af89-d7934333195e" xlink:href="ph-20260630.xsd#ph_DiversifiedIndustrialSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-757a-a485-d846fb0f7aa8" xlink:to="loc_ph_DiversifiedIndustrialSegmentMember_019e4ba9-6d5e-7a23-af89-d7934333195e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6d5e-74f5-8873-952bbc74de44" xlink:href="ph-20260630.xsd#ph_AerospaceSystemsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4ba9-6d5e-757a-a485-d846fb0f7aa8" xlink:to="loc_ph_AerospaceSystemsSegmentMember_019e4ba9-6d5e-74f5-8873-952bbc74de44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019e4ba9-6d5e-79a3-8d29-49a8f6ddb4aa" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019e4ba9-6d5e-7983-8132-3d21a561d4c4" xlink:to="loc_srt_StatementGeographicalAxis_019e4ba9-6d5e-79a3-8d29-49a8f6ddb4aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e4ba9-6d5e-79a3-8d29-49a8f6ddb4aa_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019e4ba9-6d5e-79a3-8d29-49a8f6ddb4aa" xlink:to="loc_srt_SegmentGeographicalDomain_019e4ba9-6d5e-79a3-8d29-49a8f6ddb4aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019e4ba9-6d5e-79dd-bd47-a1aa2e777ccd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019e4ba9-6d5e-79a3-8d29-49a8f6ddb4aa" xlink:to="loc_srt_SegmentGeographicalDomain_019e4ba9-6d5e-79dd-bd47-a1aa2e777ccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e4ba9-6d5e-7278-b2fe-04ba85726f39" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e4ba9-6d5e-79dd-bd47-a1aa2e777ccd" xlink:to="loc_country_US_019e4ba9-6d5e-7278-b2fe-04ba85726f39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019e4ba9-6d5e-72ac-a373-8f2004827603" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019e4ba9-6d5e-79dd-bd47-a1aa2e777ccd" xlink:to="loc_us-gaap_NonUsMember_019e4ba9-6d5e-72ac-a373-8f2004827603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6d5e-7a1b-8554-a42c32d441e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4ba9-6d5e-7a1b-8554-a42c32d441e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019e4ba9-6d5e-7652-bc2c-251168f975e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019e4ba9-6d5e-7652-bc2c-251168f975e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019e4ba9-6d5e-7430-8cdc-cf728b0a7d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_OperatingIncomeLoss_019e4ba9-6d5e-7430-8cdc-cf728b0a7d7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e4ba9-6d5e-7be0-b30b-7f8999d76c93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e4ba9-6d5e-7be0-b30b-7f8999d76c93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019e4ba9-6d5e-71cd-b093-1b1dd6e8ba5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019e4ba9-6d5e-71cd-b093-1b1dd6e8ba5b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019e4ba9-6d5e-744e-8920-3f7e22330c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019e4ba9-6d5e-744e-8920-3f7e22330c7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e4ba9-6d5e-7644-b2ce-aa38a7a431c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e4ba9-6d5e-7644-b2ce-aa38a7a431c6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e4ba9-6d5e-77ff-b97b-b5156cb7840e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_Assets_019e4ba9-6d5e-77ff-b97b-b5156cb7840e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e4ba9-6d5e-782a-9f26-c56be96ba481" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentExpenditureAdditionToLongLivedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e4ba9-6d5e-782a-9f26-c56be96ba481" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019e4ba9-6d5e-7f67-aef9-f68803d2e5a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_EquityMethodInvestments_019e4ba9-6d5e-7f67-aef9-f68803d2e5a9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019e4ba9-6d5e-7c9c-a6c1-d39228fdc73d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_Depreciation_019e4ba9-6d5e-7c9c-a6c1-d39228fdc73d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDeferredCharges_019e4ba9-6d5e-717a-ae1b-b26306fb124a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfDeferredCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_AmortizationOfDeferredCharges_019e4ba9-6d5e-717a-ae1b-b26306fb124a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_019e4ba9-6d5e-7b6c-9f72-b9eaa6bdc8a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4ba9-6d5e-77bd-958a-4eaf2865d074" xlink:to="loc_us-gaap_NoncurrentAssets_019e4ba9-6d5e-7b6c-9f72-b9eaa6bdc8a0" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://parkerhannifin.com/role/SubsequentEventDetails" xlink:type="simple" xlink:href="ph-20260630.xsd#SubsequentEventDetails"/>
  <link:definitionLink xlink:role="http://parkerhannifin.com/role/SubsequentEventDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019fd798-cd02-7913-9298-969c2ca9527a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019fd798-cd02-78b2-a735-b3fb4c0797b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019fd798-cd02-7913-9298-969c2ca9527a" xlink:to="loc_us-gaap_SubsequentEventTable_019fd798-cd02-78b2-a735-b3fb4c0797b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019fec12-d199-7a85-8e58-741707aa2d48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019fd798-cd02-78b2-a735-b3fb4c0797b1" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019fec12-d199-7a85-8e58-741707aa2d48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fec12-d199-7a85-8e58-741707aa2d48_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fec12-d199-7a85-8e58-741707aa2d48" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fec12-d199-7a85-8e58-741707aa2d48_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019fec12-d199-7841-81de-94be3ed190dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019fec12-d199-7a85-8e58-741707aa2d48" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019fec12-d199-7841-81de-94be3ed190dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019fec12-fd5c-7563-a8b3-f13066db52f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019fec12-d199-7841-81de-94be3ed190dc" xlink:to="loc_us-gaap_SubsequentEventMember_019fec12-fd5c-7563-a8b3-f13066db52f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fd798-cd02-7adb-b3e1-f6970ce86be3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019fd798-cd02-78b2-a735-b3fb4c0797b1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fd798-cd02-7adb-b3e1-f6970ce86be3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd798-cd02-7adb-b3e1-f6970ce86be3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fd798-cd02-7adb-b3e1-f6970ce86be3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd798-cd02-7adb-b3e1-f6970ce86be3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd798-cd02-715b-a39c-26912e4d7665" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fd798-cd02-7adb-b3e1-f6970ce86be3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd798-cd02-715b-a39c-26912e4d7665" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ph_FiltrationGroupCorporationMember_019fd798-cd02-77ae-be99-8597250692bd" xlink:href="ph-20260630.xsd#ph_FiltrationGroupCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fd798-cd02-715b-a39c-26912e4d7665" xlink:to="loc_ph_FiltrationGroupCorporationMember_019fd798-cd02-77ae-be99-8597250692bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fec0d-1625-7b39-b68b-03b3490f047a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019fd798-cd02-7913-9298-969c2ca9527a" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019fec0d-1625-7b39-b68b-03b3490f047a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccountsPayableCurrent" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent" xlink:type="arc" order="42"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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="102"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent" xlink:type="arc" order="31"/>
  </link:definitionLink>
</link:linkbase>
