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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e4258-c1e9-700f-8459-c08f2828dd25,g:5bd5f3e0-5cef-4400-9fa8-74063f92183e-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.ugicorp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY" xlink:type="simple" xlink:href="ugi-20260630.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e4258-c594-78b1-9f7a-8849015a7e54" 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_019e4258-c594-70e4-ac19-c52ed422915b" 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_019e4258-c594-78b1-9f7a-8849015a7e54" xlink:to="loc_us-gaap_StatementTable_019e4258-c594-70e4-ac19-c52ed422915b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e4258-c594-7263-803c-d8a07fd1fc4e" 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_019e4258-c594-70e4-ac19-c52ed422915b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e4258-c594-7263-803c-d8a07fd1fc4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4258-c594-7263-803c-d8a07fd1fc4e_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_019e4258-c594-7263-803c-d8a07fd1fc4e" xlink:to="loc_us-gaap_EquityComponentDomain_019e4258-c594-7263-803c-d8a07fd1fc4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4258-c594-7cb9-964e-a0303cddee43" 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_019e4258-c594-7263-803c-d8a07fd1fc4e" xlink:to="loc_us-gaap_EquityComponentDomain_019e4258-c594-7cb9-964e-a0303cddee43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_019e4258-c594-7f6f-bd74-57dc4209d9f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019e4258-c594-7cb9-964e-a0303cddee43" xlink:to="loc_us-gaap_ParentMember_019e4258-c594-7f6f-bd74-57dc4209d9f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_019e4258-c594-751d-a99d-fc354ce2b720" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_019e4258-c594-7f6f-bd74-57dc4209d9f0" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_019e4258-c594-751d-a99d-fc354ce2b720" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019e4258-c594-7d98-844e-f124166ccc7c" 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_ParentMember_019e4258-c594-7f6f-bd74-57dc4209d9f0" xlink:to="loc_us-gaap_RetainedEarningsMember_019e4258-c594-7d98-844e-f124166ccc7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4258-c594-712b-8330-82ae6d0490f6" 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_ParentMember_019e4258-c594-7f6f-bd74-57dc4209d9f0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4258-c594-712b-8330-82ae6d0490f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019e4258-c594-7dca-bbdd-e537990d32d1" 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_ParentMember_019e4258-c594-7f6f-bd74-57dc4209d9f0" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019e4258-c594-7dca-bbdd-e537990d32d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019e4258-c594-7583-9ed2-ed0a63a75d6b" 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_019e4258-c594-7cb9-964e-a0303cddee43" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019e4258-c594-7583-9ed2-ed0a63a75d6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" 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_019e4258-c594-78b1-9f7a-8849015a7e54" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4258-c594-7dab-a250-96a7c4ad5a8c" 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_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4258-c594-7dab-a250-96a7c4ad5a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e4258-c594-7389-857e-d6966d449ea5" 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_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e4258-c594-7389-857e-d6966d449ea5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e4258-c594-75cb-9531-31fb5ca42a81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019e4258-c594-75cb-9531-31fb5ca42a81" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e4258-c594-7dd2-8f4e-f0adff7b2836" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_NetIncomeLoss_019e4258-c594-7dd2-8f4e-f0adff7b2836" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019e4258-c594-797b-a2ae-d51efe8a8c77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_DividendsCommonStockCash_019e4258-c594-797b-a2ae-d51efe8a8c77" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019e4258-c594-7da4-8427-cb3f02a18b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_019e4258-c594-7da4-8427-cb3f02a18b2c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e4258-c594-70b5-9524-aed0fe571cf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019e4258-c594-70b5-9524-aed0fe571cf8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_StockRepurchasedDuringPeriodEmployeeAndDirectorPlansValue_019e4258-c594-791d-ac99-c302ff3e9c49" xlink:href="ugi-20260630.xsd#ugi_StockRepurchasedDuringPeriodEmployeeAndDirectorPlansValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_ugi_StockRepurchasedDuringPeriodEmployeeAndDirectorPlansValue_019e4258-c594-791d-ac99-c302ff3e9c49" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_019e4258-c594-7715-adfe-d0d8fbe5cdf3" 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_019e4258-c594-7e44-befd-7b0d789288f6" xlink:to="loc_us-gaap_StockholdersEquityOther_019e4258-c594-7715-adfe-d0d8fbe5cdf3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4258-c594-7327-9cd6-0bcaa92b8d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c594-72f4-a222-8bc2c56509e5" 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_019e4258-c594-7b3a-bccb-c79da1fefe59" 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_019e4258-c594-72f4-a222-8bc2c56509e5" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4258-c594-7b3a-bccb-c79da1fefe59" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c594-77fa-828a-e09a124d30c9" 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_019e4258-c594-7b3a-bccb-c79da1fefe59" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c594-77fa-828a-e09a124d30c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c594-77fa-828a-e09a124d30c9_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_019e4258-c594-77fa-828a-e09a124d30c9" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c594-77fa-828a-e09a124d30c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c594-7713-9bce-33ffe3443a98" 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_019e4258-c594-77fa-828a-e09a124d30c9" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c594-7713-9bce-33ffe3443a98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPropaneMember_019e4258-c594-7249-91f2-82ee06386ec3" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPropaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c594-7713-9bce-33ffe3443a98" xlink:to="loc_ugi_AmeriGasPropaneMember_019e4258-c594-7249-91f2-82ee06386ec3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_019e4258-c594-7f04-9de1-a0fa354b8110" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c594-72f4-a222-8bc2c56509e5" xlink:to="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_019e4258-c594-7f04-9de1-a0fa354b8110" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e4258-c594-77da-ac9d-38759285a5e7" 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_SegmentReportingInformationLineItems_019e4258-c594-72f4-a222-8bc2c56509e5" xlink:to="loc_us-gaap_Goodwill_019e4258-c594-77da-ac9d-38759285a5e7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/RevenuefromContractswithCustomersScheduleofDisaggregatedRevenuesbyReportableSegmentDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#RevenuefromContractswithCustomersScheduleofDisaggregatedRevenuesbyReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/RevenuefromContractswithCustomersScheduleofDisaggregatedRevenuesbyReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4258-c594-7e1b-ad06-797db69dcf06" 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_019e4258-c594-742a-ad23-36a5d3d37cac" 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_019e4258-c594-7e1b-ad06-797db69dcf06" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e4258-c594-742a-ad23-36a5d3d37cac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e4258-c594-77a4-9acf-c3d252298dd9" 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_DisaggregationOfRevenueTable_019e4258-c594-742a-ad23-36a5d3d37cac" xlink:to="loc_srt_ConsolidationItemsAxis_019e4258-c594-77a4-9acf-c3d252298dd9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4258-c594-77a4-9acf-c3d252298dd9_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_019e4258-c594-77a4-9acf-c3d252298dd9" xlink:to="loc_srt_ConsolidationItemsDomain_019e4258-c594-77a4-9acf-c3d252298dd9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4258-c594-7bc0-8bfe-ea952573b66b" 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_019e4258-c594-77a4-9acf-c3d252298dd9" xlink:to="loc_srt_ConsolidationItemsDomain_019e4258-c594-7bc0-8bfe-ea952573b66b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019e4258-c594-7b87-a24f-5af50c9746a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4258-c594-7bc0-8bfe-ea952573b66b" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019e4258-c594-7b87-a24f-5af50c9746a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e4258-c594-70f1-a2e1-c6680eb24221" 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_019e4258-c594-7bc0-8bfe-ea952573b66b" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e4258-c594-70f1-a2e1-c6680eb24221" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019e4258-c594-7780-98da-0c470962c6af" 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_019e4258-c594-7bc0-8bfe-ea952573b66b" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019e4258-c594-7780-98da-0c470962c6af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c594-7834-a2be-50218b39b7b5" 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_019e4258-c594-742a-ad23-36a5d3d37cac" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c594-7834-a2be-50218b39b7b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c594-7834-a2be-50218b39b7b5_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_019e4258-c594-7834-a2be-50218b39b7b5" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c594-7834-a2be-50218b39b7b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c594-76de-93f2-929cc2e3cd5c" 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_019e4258-c594-7834-a2be-50218b39b7b5" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c594-76de-93f2-929cc2e3cd5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIUtilitiesIncMember_019e4258-c594-7b33-bd58-46365a9a4253" xlink:href="ugi-20260630.xsd#ugi_UGIUtilitiesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c594-76de-93f2-929cc2e3cd5c" xlink:to="loc_ugi_UGIUtilitiesIncMember_019e4258-c594-7b33-bd58-46365a9a4253" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MidstreamAndMarketingMember_019e4258-c594-7893-8490-33fe940bcd94" xlink:href="ugi-20260630.xsd#ugi_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c594-76de-93f2-929cc2e3cd5c" xlink:to="loc_ugi_MidstreamAndMarketingMember_019e4258-c594-7893-8490-33fe940bcd94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIInternationalLLCMember_019e4258-c594-7b93-a8bb-55e93bd56ad9" xlink:href="ugi-20260630.xsd#ugi_UGIInternationalLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c594-76de-93f2-929cc2e3cd5c" xlink:to="loc_ugi_UGIInternationalLLCMember_019e4258-c594-7b93-a8bb-55e93bd56ad9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPropaneMember_019e4258-c594-7f67-9705-89c2b5910684" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPropaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c594-76de-93f2-929cc2e3cd5c" xlink:to="loc_ugi_AmeriGasPropaneMember_019e4258-c594-7f67-9705-89c2b5910684" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e4258-c594-7978-bff8-250dfd10eada" 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_019e4258-c594-742a-ad23-36a5d3d37cac" xlink:to="loc_srt_ProductOrServiceAxis_019e4258-c594-7978-bff8-250dfd10eada" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e4258-c594-7978-bff8-250dfd10eada_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_019e4258-c594-7978-bff8-250dfd10eada" xlink:to="loc_srt_ProductsAndServicesDomain_019e4258-c594-7978-bff8-250dfd10eada_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e4258-c594-74da-8f43-7cca894152cb" 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_019e4258-c594-7978-bff8-250dfd10eada" xlink:to="loc_srt_ProductsAndServicesDomain_019e4258-c594-74da-8f43-7cca894152cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:href="ugi-20260630.xsd#ugi_UtilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4258-c594-74da-8f43-7cca894152cb" xlink:to="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ResidentialMember_019e4258-c594-7576-9e13-f34d864f4332" xlink:href="ugi-20260630.xsd#ugi_ResidentialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:to="loc_ugi_ResidentialMember_019e4258-c594-7576-9e13-f34d864f4332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_CommercialandIndustrialMember_019e4258-c594-7cab-9a86-344bb294df62" xlink:href="ugi-20260630.xsd#ugi_CommercialandIndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:to="loc_ugi_CommercialandIndustrialMember_019e4258-c594-7cab-9a86-344bb294df62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_LargeDeliveryServiceMember_019e4258-c594-7231-b632-b658d2ba7e36" xlink:href="ugi-20260630.xsd#ugi_LargeDeliveryServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:to="loc_ugi_LargeDeliveryServiceMember_019e4258-c594-7231-b632-b658d2ba7e36" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_OffSystemSalesandCapacityReleasesMember_019e4258-c594-764e-8f76-0da663fe2543" xlink:href="ugi-20260630.xsd#ugi_OffSystemSalesandCapacityReleasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:to="loc_ugi_OffSystemSalesandCapacityReleasesMember_019e4258-c594-764e-8f76-0da663fe2543" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UtilityOtherMember_019e4258-c594-708d-b776-328b8ad729c5" xlink:href="ugi-20260630.xsd#ugi_UtilityOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_UtilityMember_019e4258-c594-7cc4-b841-ad4c5b133d7a" xlink:to="loc_ugi_UtilityOtherMember_019e4258-c594-708d-b776-328b8ad729c5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:href="ugi-20260630.xsd#ugi_NonutilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e4258-c594-74da-8f43-7cca894152cb" xlink:to="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetailMember_019e4258-c594-709d-a664-3cd913d5536d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetailMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_us-gaap_RetailMember_019e4258-c594-709d-a664-3cd913d5536d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_WholesaleMember_019e4258-c594-7b00-bec1-36750ae22201" xlink:href="ugi-20260630.xsd#ugi_WholesaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_ugi_WholesaleMember_019e4258-c594-7b00-bec1-36750ae22201" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_EnergyMarketingMember_019e4258-c594-7254-b3a2-30fcb6b9fc8f" xlink:href="ugi-20260630.xsd#ugi_EnergyMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_ugi_EnergyMarketingMember_019e4258-c594-7254-b3a2-30fcb6b9fc8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PipelineMember_019e4258-c594-7685-a826-ad5a03825f2e" xlink:href="ugi-20260630.xsd#ugi_PipelineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_ugi_PipelineMember_019e4258-c594-7685-a826-ad5a03825f2e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PeakingMember_019e4258-c594-74ea-995d-b192ca3fd7e1" xlink:href="ugi-20260630.xsd#ugi_PeakingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_ugi_PeakingMember_019e4258-c594-74ea-995d-b192ca3fd7e1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MidstreamOtherMember_019e4258-c594-7e01-a206-2900396fa03f" xlink:href="ugi-20260630.xsd#ugi_MidstreamOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_ugi_MidstreamOtherMember_019e4258-c594-7e01-a206-2900396fa03f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NonutilityOtherMember_019e4258-c594-7992-86b6-603fc837a33e" xlink:href="ugi-20260630.xsd#ugi_NonutilityOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_NonutilityMember_019e4258-c594-77ab-9f4d-3debe6f70572" xlink:to="loc_ugi_NonutilityOtherMember_019e4258-c594-7992-86b6-603fc837a33e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4258-c594-7bad-93ed-dac0bdaab62b" 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_019e4258-c594-7e1b-ad06-797db69dcf06" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e4258-c594-7bad-93ed-dac0bdaab62b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomer_019e4258-c594-722f-8cba-ed33f10337cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueNotFromContractWithCustomer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4258-c594-7e1b-ad06-797db69dcf06" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomer_019e4258-c594-722f-8cba-ed33f10337cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e4258-c594-7885-bfad-4e5410107a0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4258-c594-7e1b-ad06-797db69dcf06" xlink:to="loc_us-gaap_Revenues_019e4258-c594-7885-bfad-4e5410107a0a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/RevenuefromContractswithCustomersNarrativeDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#RevenuefromContractswithCustomersNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/RevenuefromContractswithCustomersNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4258-c594-7d6e-95ba-01ee13f2368d" 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_019e4258-c594-7b7e-a1f0-1c7353bab048" 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_019e4258-c594-7d6e-95ba-01ee13f2368d" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e4258-c594-7b7e-a1f0-1c7353bab048" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c594-7127-92d4-df752d894b03" 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_019e4258-c594-7b7e-a1f0-1c7353bab048" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c594-7127-92d4-df752d894b03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c594-7127-92d4-df752d894b03_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_019e4258-c594-7127-92d4-df752d894b03" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c594-7127-92d4-df752d894b03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c594-76cb-b052-4c58245694f9" 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_019e4258-c594-7127-92d4-df752d894b03" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c594-76cb-b052-4c58245694f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MidstreamAndMarketingMember_019e4258-c594-7365-99b3-19d5d36b219f" xlink:href="ugi-20260630.xsd#ugi_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c594-76cb-b052-4c58245694f9" xlink:to="loc_ugi_MidstreamAndMarketingMember_019e4258-c594-7365-99b3-19d5d36b219f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019e4258-c594-734f-8d58-cd4a843b3b12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e4258-c594-7d6e-95ba-01ee13f2368d" xlink:to="loc_us-gaap_ContractWithCustomerLiability_019e4258-c594-734f-8d58-cd4a843b3b12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e4258-c594-7d5b-8761-7a21e385690a" 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_DisaggregationOfRevenueLineItems_019e4258-c594-7d6e-95ba-01ee13f2368d" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_019e4258-c594-7d5b-8761-7a21e385690a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e4258-c594-7845-9529-e8a81ab57826" 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_DisaggregationOfRevenueLineItems_019e4258-c594-7d6e-95ba-01ee13f2368d" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e4258-c594-7845-9529-e8a81ab57826" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DispositionsDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DispositionsDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DispositionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e4258-c594-7cfd-88d3-0e672af8a3c4" 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_019e4258-c594-74be-a2fb-f62e7fd837bd" 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_019e4258-c594-7cfd-88d3-0e672af8a3c4" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e4258-c594-74be-a2fb-f62e7fd837bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019e4258-c594-7fdc-9096-134668f4949e" 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_019e4258-c594-74be-a2fb-f62e7fd837bd" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019e4258-c594-7fdc-9096-134668f4949e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c594-7fdc-9096-134668f4949e_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_019e4258-c594-7fdc-9096-134668f4949e" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c594-7fdc-9096-134668f4949e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c594-7d85-a53c-a0d0c0758e3d" 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_019e4258-c594-7fdc-9096-134668f4949e" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c594-7d85-a53c-a0d0c0758e3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019e4258-c594-7ccc-b8e5-9409cde23cac" 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_019e4258-c594-7d85-a53c-a0d0c0758e3d" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019e4258-c594-7ccc-b8e5-9409cde23cac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019e4258-c594-74cc-a567-be004d0f8aef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c594-7d85-a53c-a0d0c0758e3d" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019e4258-c594-74cc-a567-be004d0f8aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e4258-c594-7b4e-b000-6887858b5879" 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_019e4258-c594-74be-a2fb-f62e7fd837bd" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e4258-c594-7b4e-b000-6887858b5879" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-7b4e-b000-6887858b5879_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_019e4258-c594-7b4e-b000-6887858b5879" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-7b4e-b000-6887858b5879_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" 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_019e4258-c594-7b4e-b000-6887858b5879" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ElectricUtilityMember_019e4258-c594-73d0-8cf8-8ffe554901a1" xlink:href="ugi-20260630.xsd#ugi_ElectricUtilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" xlink:to="loc_ugi_ElectricUtilityMember_019e4258-c594-73d0-8cf8-8ffe554901a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_LPGDistributionBusinessesMember_019e4258-c594-78b2-a237-7395c1d6f460" xlink:href="ugi-20260630.xsd#ugi_LPGDistributionBusinessesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" xlink:to="loc_ugi_LPGDistributionBusinessesMember_019e4258-c594-78b2-a237-7395c1d6f460" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_LPGBusinessRomaniaMember_019e4258-c594-785c-b61c-8daaa539a74b" xlink:href="ugi-20260630.xsd#ugi_LPGBusinessRomaniaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" xlink:to="loc_ugi_LPGBusinessRomaniaMember_019e4258-c594-785c-b61c-8daaa539a74b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_LPGDistributionBusinessFlagaMember_019e4258-c594-7839-a2ab-87fbd3936d92" xlink:href="ugi-20260630.xsd#ugi_LPGDistributionBusinessFlagaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" xlink:to="loc_ugi_LPGDistributionBusinessFlagaMember_019e4258-c594-7839-a2ab-87fbd3936d92" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_CylinderBusinessMember_019e4258-c594-7c60-92fb-ba26eecb7756" xlink:href="ugi-20260630.xsd#ugi_CylinderBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c594-76fc-86c1-527d29929238" xlink:to="loc_ugi_CylinderBusinessMember_019e4258-c594-7c60-92fb-ba26eecb7756" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019e4258-c594-7251-8789-7392511fd2ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4258-c594-7cfd-88d3-0e672af8a3c4" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration_019e4258-c594-7251-8789-7392511fd2ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DisposalGroupIncludingDiscontinuedOperationTransmissionAndDistributionLineMiles_019e4258-c594-72ea-bb2b-5338266a7973" xlink:href="ugi-20260630.xsd#ugi_DisposalGroupIncludingDiscontinuedOperationTransmissionAndDistributionLineMiles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4258-c594-7cfd-88d3-0e672af8a3c4" xlink:to="loc_ugi_DisposalGroupIncludingDiscontinuedOperationTransmissionAndDistributionLineMiles_019e4258-c594-72ea-bb2b-5338266a7973" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DisposalGroupIncludingDiscontinuedOperationNumberOfSubstations_019e4258-c594-7548-87c7-7b05720ab1f2" xlink:href="ugi-20260630.xsd#ugi_DisposalGroupIncludingDiscontinuedOperationNumberOfSubstations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4258-c594-7cfd-88d3-0e672af8a3c4" xlink:to="loc_ugi_DisposalGroupIncludingDiscontinuedOperationNumberOfSubstations_019e4258-c594-7548-87c7-7b05720ab1f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_019e4258-c594-755f-a4f8-bda30e3fea76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e4258-c594-7cfd-88d3-0e672af8a3c4" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_019e4258-c594-755f-a4f8-bda30e3fea76" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DispositionsScheduleofDispositionsDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DispositionsScheduleofDispositionsDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DispositionsScheduleofDispositionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f8cbf-4ee8-77e0-973c-5b3b34f48f4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f8cbf-2f35-7e1f-ae00-f7cb70aa93ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f8cbf-4ee8-77e0-973c-5b3b34f48f4f" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f8cbf-2f35-7e1f-ae00-f7cb70aa93ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019f8cbf-4ee8-7766-b41f-5477ebc63398" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f8cbf-2f35-7e1f-ae00-f7cb70aa93ea" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019f8cbf-4ee8-7766-b41f-5477ebc63398" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019f8cbf-4ee8-7766-b41f-5477ebc63398_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_019f8cbf-4ee8-7766-b41f-5477ebc63398" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019f8cbf-4ee8-7766-b41f-5477ebc63398_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019f8cbf-4ee8-784b-aab2-e0d4f113d7c3" 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_019f8cbf-4ee8-7766-b41f-5477ebc63398" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019f8cbf-4ee8-784b-aab2-e0d4f113d7c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019f8cbf-4ee8-76f0-8f62-8c2dbdd3596f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019f8cbf-4ee8-784b-aab2-e0d4f113d7c3" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019f8cbf-4ee8-76f0-8f62-8c2dbdd3596f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019f8cbf-4ee8-78e0-95aa-3c2cecb7983f" 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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_019f8cbf-2f35-7e1f-ae00-f7cb70aa93ea" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019f8cbf-4ee8-78e0-95aa-3c2cecb7983f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f8cbf-4ee8-78e0-95aa-3c2cecb7983f_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_019f8cbf-4ee8-78e0-95aa-3c2cecb7983f" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f8cbf-4ee8-78e0-95aa-3c2cecb7983f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f8cbf-4ee8-7c20-83ba-7be6012f8c3e" 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_019f8cbf-4ee8-78e0-95aa-3c2cecb7983f" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f8cbf-4ee8-7c20-83ba-7be6012f8c3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ElectricUtilityMember_019f8cbf-4ee8-71ca-8dff-39356e243fe0" xlink:href="ugi-20260630.xsd#ugi_ElectricUtilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019f8cbf-4ee8-7c20-83ba-7be6012f8c3e" xlink:to="loc_ugi_ElectricUtilityMember_019f8cbf-4ee8-71ca-8dff-39356e243fe0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc0-b931-7a08-907c-f62a40eac28f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f8cbf-4ee8-77e0-973c-5b3b34f48f4f" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc0-b931-7a08-907c-f62a40eac28f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent_019f8cbf-4ee8-7f1b-811d-0c735cd0af69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc0-b931-7a08-907c-f62a40eac28f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent_019f8cbf-4ee8-7f1b-811d-0c735cd0af69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_019f8cbf-4ee8-7aa6-8b59-a5620fc212da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc0-b931-7a08-907c-f62a40eac28f" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets_019f8cbf-4ee8-7aa6-8b59-a5620fc212da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_019f8cbf-4ee8-76c0-9a18-cc315c0c2618" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc0-b931-7a08-907c-f62a40eac28f" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation_019f8cbf-4ee8-76c0-9a18-cc315c0c2618" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc1-035c-7151-bde6-64352e7cb39c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_019f8cbf-4ee8-77e0-973c-5b3b34f48f4f" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc1-035c-7151-bde6-64352e7cb39c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities_019f8cbf-a487-7b6f-8424-b4e6c548ed5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc1-035c-7151-bde6-64352e7cb39c" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilities_019f8cbf-a487-7b6f-8424-b4e6c548ed5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities_019fa291-495d-7159-8475-3630704fb194" xlink:href="ugi-20260630.xsd#ugi_DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc1-035c-7151-bde6-64352e7cb39c" xlink:to="loc_ugi_DisposalGroupIncludingDiscontinuedOperationRegulatoryLiabilities_019fa291-495d-7159-8475-3630704fb194" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_019f8cbf-4ee8-7eb5-bc57-63a2d9ff951d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc1-035c-7151-bde6-64352e7cb39c" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities_019f8cbf-4ee8-7eb5-bc57-63a2d9ff951d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_019f8cbf-4ee8-7597-99e2-1bad226dfe29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrentAbstract_019f8cc1-035c-7151-bde6-64352e7cb39c" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation_019f8cbf-4ee8-7597-99e2-1bad226dfe29" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/InventoriesDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#InventoriesDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/InventoriesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-77b8-ae7f-7122767df82e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77e7-865b-015c9ed459b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-77b8-ae7f-7122767df82e" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77e7-865b-015c9ed459b0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryAxis_019e4258-c594-7846-96ec-e5e4ad2473d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77e7-865b-015c9ed459b0" xlink:to="loc_us-gaap_PublicUtilitiesInventoryAxis_019e4258-c594-7846-96ec-e5e4ad2473d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7846-96ec-e5e4ad2473d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_019e4258-c594-7846-96ec-e5e4ad2473d6" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7846-96ec-e5e4ad2473d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7b35-adda-e482046c01a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_019e4258-c594-7846-96ec-e5e4ad2473d6" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7b35-adda-e482046c01a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NonUtilityLpgAndNaturalGasMember_019e4258-c594-7688-a355-697ea9446da0" xlink:href="ugi-20260630.xsd#ugi_NonUtilityLpgAndNaturalGasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7b35-adda-e482046c01a6" xlink:to="loc_ugi_NonUtilityLpgAndNaturalGasMember_019e4258-c594-7688-a355-697ea9446da0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_GasUtilityNaturalGasMember_019e4258-c594-77e8-9e74-c75d7886ab7c" xlink:href="ugi-20260630.xsd#ugi_GasUtilityNaturalGasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7b35-adda-e482046c01a6" xlink:to="loc_ugi_GasUtilityNaturalGasMember_019e4258-c594-77e8-9e74-c75d7886ab7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_EnergyCertificatesMember_019e4258-c594-7726-8064-733281fd12d0" xlink:href="ugi-20260630.xsd#ugi_EnergyCertificatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7b35-adda-e482046c01a6" xlink:to="loc_ugi_EnergyCertificatesMember_019e4258-c594-7726-8064-733281fd12d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MaterialsSuppliesAndOtherMember_019e4258-c594-7894-8872-d603af3fe7e5" xlink:href="ugi-20260630.xsd#ugi_MaterialsSuppliesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_019e4258-c594-7b35-adda-e482046c01a6" xlink:to="loc_ugi_MaterialsSuppliesAndOtherMember_019e4258-c594-7894-8872-d603af3fe7e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019e4258-c594-78a4-b659-b80cb00e3d82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-77b8-ae7f-7122767df82e" xlink:to="loc_us-gaap_InventoryNet_019e4258-c594-78a4-b659-b80cb00e3d82" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/UtilityRegulatoryAssetsandLiabilitiesandRegulatoryMattersScheduleofRegulatoryAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#UtilityRegulatoryAssetsandLiabilitiesandRegulatoryMattersScheduleofRegulatoryAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/UtilityRegulatoryAssetsandLiabilitiesandRegulatoryMattersScheduleofRegulatoryAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetLineItems_019e4258-c594-748c-9742-60faf6c8297b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAssetLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRegulatoryAssetsTable_019e4258-c594-79b7-bd4e-af10f78de07c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRegulatoryAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RegulatoryAssetLineItems_019e4258-c594-748c-9742-60faf6c8297b" xlink:to="loc_us-gaap_ScheduleOfRegulatoryAssetsTable_019e4258-c594-79b7-bd4e-af10f78de07c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4258-c594-7b25-be74-b99201b75d40" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRegulatoryAssetsTable_019e4258-c594-79b7-bd4e-af10f78de07c" xlink:to="loc_dei_LegalEntityAxis_019e4258-c594-7b25-be74-b99201b75d40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c594-7b25-be74-b99201b75d40_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4258-c594-7b25-be74-b99201b75d40" xlink:to="loc_dei_EntityDomain_019e4258-c594-7b25-be74-b99201b75d40_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c594-74f0-82f6-743f0fe15d36" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4258-c594-7b25-be74-b99201b75d40" xlink:to="loc_dei_EntityDomain_019e4258-c594-74f0-82f6-743f0fe15d36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIUtilitiesIncMember_019e4258-c594-7a29-9de4-3f1264a9d235" xlink:href="ugi-20260630.xsd#ugi_UGIUtilitiesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4258-c594-74f0-82f6-743f0fe15d36" xlink:to="loc_ugi_UGIUtilitiesIncMember_019e4258-c594-7a29-9de4-3f1264a9d235" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetAxis_019e4258-c594-7b0d-95ef-499e95cb3abf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAssetAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRegulatoryAssetsTable_019e4258-c594-79b7-bd4e-af10f78de07c" xlink:to="loc_us-gaap_RegulatoryAssetAxis_019e4258-c594-7b0d-95ef-499e95cb3abf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7b0d-95ef-499e95cb3abf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RegulatoryAssetAxis_019e4258-c594-7b0d-95ef-499e95cb3abf" xlink:to="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7b0d-95ef-499e95cb3abf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAssetDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RegulatoryAssetAxis_019e4258-c594-7b0d-95ef-499e95cb3abf" xlink:to="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_IncomeTaxesRecoverableMember_019e4258-c594-7b5a-8005-cb65755fe8bd" xlink:href="ugi-20260630.xsd#ugi_IncomeTaxesRecoverableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:to="loc_ugi_IncomeTaxesRecoverableMember_019e4258-c594-7b5a-8005-cb65755fe8bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionCostsMember_019e4258-c594-716f-a295-bdb59bfb5af6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:to="loc_us-gaap_PensionCostsMember_019e4258-c594-716f-a295-bdb59bfb5af6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRestorationCostsMember_019e4258-c594-7a2f-8846-dec77a024f12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRestorationCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:to="loc_us-gaap_EnvironmentalRestorationCostsMember_019e4258-c594-7a2f-8846-dec77a024f12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFuelCostsMember_019e4258-c594-7c2d-9851-c0847dbdf150" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFuelCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:to="loc_us-gaap_DeferredFuelCostsMember_019e4258-c594-7c2d-9851-c0847dbdf150" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_RemovalCostsNetMember_019e4258-c594-7770-8fee-3cce546fa97f" xlink:href="ugi-20260630.xsd#ugi_RemovalCostsNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:to="loc_ugi_RemovalCostsNetMember_019e4258-c594-7770-8fee-3cce546fa97f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_019e4258-c594-7a44-a9b4-5c4f69ebcb7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherRegulatoryAssetsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetDomain_019e4258-c594-7eb4-b7a9-d4a897217e35" xlink:to="loc_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_019e4258-c594-7a44-a9b4-5c4f69ebcb7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAssets_019e4258-c594-7314-8bce-c76dd8b727d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAssetLineItems_019e4258-c594-748c-9742-60faf6c8297b" xlink:to="loc_us-gaap_RegulatoryAssets_019e4258-c594-7314-8bce-c76dd8b727d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryLiabilitiesLineItems_019e4258-c594-756d-a133-ed82e66cd44e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_019e4258-c594-7a12-9be7-c1db7db6b92e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRegulatoryLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RegulatoryLiabilitiesLineItems_019e4258-c594-756d-a133-ed82e66cd44e" xlink:to="loc_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_019e4258-c594-7a12-9be7-c1db7db6b92e" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4258-c594-76ad-94ac-3a33bd29dd15" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_019e4258-c594-7a12-9be7-c1db7db6b92e" xlink:to="loc_dei_LegalEntityAxis_019e4258-c594-76ad-94ac-3a33bd29dd15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c594-76ad-94ac-3a33bd29dd15_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c594-7b2b-8c9b-2022818187bc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIUtilitiesIncMember_019e4258-c594-7296-b6d9-02fa61e9b7d0" xlink:href="ugi-20260630.xsd#ugi_UGIUtilitiesIncMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryLiabilityAxis_019e4258-c594-7289-ae5d-edc53af750d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryLiabilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRegulatoryLiabilitiesTable_019e4258-c594-7a12-9be7-c1db7db6b92e" xlink:to="loc_us-gaap_RegulatoryLiabilityAxis_019e4258-c594-7289-ae5d-edc53af750d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7289-ae5d-edc53af750d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryLiabilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RegulatoryLiabilityAxis_019e4258-c594-7289-ae5d-edc53af750d5" xlink:to="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7289-ae5d-edc53af750d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryLiabilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RegulatoryLiabilityAxis_019e4258-c594-7289-ae5d-edc53af750d5" xlink:to="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PostretirementBenefitCostsMember_019e4258-c594-7ff0-92e2-09d653f7627a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PostretirementBenefitCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:to="loc_us-gaap_PostretirementBenefitCostsMember_019e4258-c594-7ff0-92e2-09d653f7627a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DeferredFuelAndPowerRefundsMember_019e4258-c594-7616-95b7-4a4c11732405" xlink:href="ugi-20260630.xsd#ugi_DeferredFuelAndPowerRefundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:to="loc_ugi_DeferredFuelAndPowerRefundsMember_019e4258-c594-7616-95b7-4a4c11732405" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxChargesMember_019e4258-c594-7f45-8f67-e1f0890a7b9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxChargesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:to="loc_us-gaap_DeferredIncomeTaxChargesMember_019e4258-c594-7f45-8f67-e1f0890a7b9b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ExcessFederalDeferredIncomeTaxesMember_019e4258-c594-79ae-be31-8beb41b24aa7" xlink:href="ugi-20260630.xsd#ugi_ExcessFederalDeferredIncomeTaxesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:to="loc_ugi_ExcessFederalDeferredIncomeTaxesMember_019e4258-c594-79ae-be31-8beb41b24aa7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_019e4258-c594-7734-9a05-883713cb68f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherRegulatoryAssetsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryLiabilityDomain_019e4258-c594-7dc9-9f4c-579e562d6d8a" xlink:to="loc_us-gaap_OtherRegulatoryAssetsLiabilitiesMember_019e4258-c594-7734-9a05-883713cb68f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryLiabilities_019e4258-c594-7f57-b951-b560f529d72f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryLiabilitiesLineItems_019e4258-c594-756d-a133-ed82e66cd44e" xlink:to="loc_us-gaap_RegulatoryLiabilities_019e4258-c594-7f57-b951-b560f529d72f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/UtilityRegulatoryAssetsandLiabilitiesandRegulatoryMattersNarrativeDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#UtilityRegulatoryAssetsandLiabilitiesandRegulatoryMattersNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/UtilityRegulatoryAssetsandLiabilitiesandRegulatoryMattersNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-7bfb-942d-05cd639d57e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77d4-a73a-865b5359b0fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-7bfb-942d-05cd639d57e6" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77d4-a73a-865b5359b0fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_019e4258-c594-7f0d-b38f-2c88aa6c01b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesRegulatoryProceedingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77d4-a73a-865b5359b0fb" xlink:to="loc_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_019e4258-c594-7f0d-b38f-2c88aa6c01b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7f0d-b38f-2c88aa6c01b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesRegulatoryProceedingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_019e4258-c594-7f0d-b38f-2c88aa6c01b0" xlink:to="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7f0d-b38f-2c88aa6c01b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesRegulatoryProceedingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingAxis_019e4258-c594-7f0d-b38f-2c88aa6c01b0" xlink:to="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2026PennsylvaniaPublicUtilityCommissionForBaseOperatingRevenuesMember_019e4258-c594-79cc-8034-65f3e5390bb5" xlink:href="ugi-20260630.xsd#ugi_A2026PennsylvaniaPublicUtilityCommissionForBaseOperatingRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2026PennsylvaniaPublicUtilityCommissionForBaseOperatingRevenuesMember_019e4258-c594-79cc-8034-65f3e5390bb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_IncreaseToAnnualBaseDistributionRevenuesMember_019e4258-c594-71a7-879b-f0bdf3f0e3fd" xlink:href="ugi-20260630.xsd#ugi_IncreaseToAnnualBaseDistributionRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_IncreaseToAnnualBaseDistributionRevenuesMember_019e4258-c594-71a7-879b-f0bdf3f0e3fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_IncreaseToBaseOperatingRevenuesMember_019f6890-bae9-7d62-bdb7-4a76a522587e" xlink:href="ugi-20260630.xsd#ugi_IncreaseToBaseOperatingRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_IncreaseToBaseOperatingRevenuesMember_019f6890-bae9-7d62-bdb7-4a76a522587e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AnnualBaseDistributionRateIncreaseMember_019fb66e-6821-7a96-9aff-3145cce39dcb" xlink:href="ugi-20260630.xsd#ugi_AnnualBaseDistributionRateIncreaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_AnnualBaseDistributionRateIncreaseMember_019fb66e-6821-7a96-9aff-3145cce39dcb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AnnualBaseDistributionRateIncreaseEffectiveOctober12026Member_019f68a9-e539-7a7f-8706-c09252c94b8d" xlink:href="ugi-20260630.xsd#ugi_AnnualBaseDistributionRateIncreaseEffectiveOctober12026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_AnnualBaseDistributionRateIncreaseMember_019fb66e-6821-7a96-9aff-3145cce39dcb" xlink:to="loc_ugi_AnnualBaseDistributionRateIncreaseEffectiveOctober12026Member_019f68a9-e539-7a7f-8706-c09252c94b8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AnnualBaseDistributionRateIncreaseEffectiveOctober12027Member_019f68aa-7ecc-7e43-af58-8acbf68de3c4" xlink:href="ugi-20260630.xsd#ugi_AnnualBaseDistributionRateIncreaseEffectiveOctober12027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_AnnualBaseDistributionRateIncreaseMember_019fb66e-6821-7a96-9aff-3145cce39dcb" xlink:to="loc_ugi_AnnualBaseDistributionRateIncreaseEffectiveOctober12027Member_019f68aa-7ecc-7e43-af58-8acbf68de3c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NetRevenueIncreaseMember_019e4258-c594-7856-a2ec-5c17c0201f3a" xlink:href="ugi-20260630.xsd#ugi_NetRevenueIncreaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_NetRevenueIncreaseMember_019e4258-c594-7856-a2ec-5c17c0201f3a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_BaseRateCaseBaseRateMember_019e4258-c594-78e0-8b77-a50fbfc7ed3b" xlink:href="ugi-20260630.xsd#ugi_BaseRateCaseBaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_BaseRateCaseBaseRateMember_019e4258-c594-78e0-8b77-a50fbfc7ed3b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_BaseRateCaseInfrastructureReplacementAndExpansionPlanMember_019e4258-c594-7cf5-8bd9-7683e331410d" xlink:href="ugi-20260630.xsd#ugi_BaseRateCaseInfrastructureReplacementAndExpansionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_BaseRateCaseInfrastructureReplacementAndExpansionPlanMember_019e4258-c594-7cf5-8bd9-7683e331410d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanExpectedMember_019fa2f0-782e-7417-91b6-06eef46a88c6" xlink:href="ugi-20260630.xsd#ugi_A2026InfrastructureReplacementAndExpansionPlanExpectedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanExpectedMember_019fa2f0-782e-7417-91b6-06eef46a88c6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember_019fa2f1-0025-768c-a116-4143e4a5c4aa" xlink:href="ugi-20260630.xsd#ugi_A2026InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember_019fa2f1-0025-768c-a116-4143e4a5c4aa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanCapitalInvestments2027Member_019fa2f1-7aeb-7f52-98a5-1a1d51478fa8" xlink:href="ugi-20260630.xsd#ugi_A2026InfrastructureReplacementAndExpansionPlanCapitalInvestments2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanCapitalInvestments2027Member_019fa2f1-7aeb-7f52-98a5-1a1d51478fa8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanCapitalImprovements2027Through2031Member_019fa2f2-388e-7d65-ba36-eadcbfb0b8cc" xlink:href="ugi-20260630.xsd#ugi_A2026InfrastructureReplacementAndExpansionPlanCapitalImprovements2027Through2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2026InfrastructureReplacementAndExpansionPlanCapitalImprovements2027Through2031Member_019fa2f2-388e-7d65-ba36-eadcbfb0b8cc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanExpectedMember_019e4258-c594-7fb5-9140-3d30011f7ad7" xlink:href="ugi-20260630.xsd#ugi_A2025InfrastructureReplacementAndExpansionPlanExpectedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanExpectedMember_019e4258-c594-7fb5-9140-3d30011f7ad7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember_019e4258-c594-7f89-b6db-62cd3e5d0cd2" xlink:href="ugi-20260630.xsd#ugi_A2025InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember_019e4258-c594-7f89-b6db-62cd3e5d0cd2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanCapitalInvestments2026Member_019e4258-c594-7593-a2e1-f91f3c894268" xlink:href="ugi-20260630.xsd#ugi_A2025InfrastructureReplacementAndExpansionPlanCapitalInvestments2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanCapitalInvestments2026Member_019e4258-c594-7593-a2e1-f91f3c894268" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanCapitalImprovements2026Through2030Member_019e4258-c594-7933-b39a-24709b03f0c7" xlink:href="ugi-20260630.xsd#ugi_A2025InfrastructureReplacementAndExpansionPlanCapitalImprovements2026Through2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2025InfrastructureReplacementAndExpansionPlanCapitalImprovements2026Through2030Member_019e4258-c594-7933-b39a-24709b03f0c7" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanExpectedMember_019e4258-c594-7839-b873-48f2888fb7bf" xlink:href="ugi-20260630.xsd#ugi_A2024InfrastructureReplacementAndExpansionPlanExpectedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanExpectedMember_019e4258-c594-7839-b873-48f2888fb7bf" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember_019e4258-c594-79c7-81f8-cabd2a0fdc72" xlink:href="ugi-20260630.xsd#ugi_A2024InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanPriorYearUnderRecoveryMember_019e4258-c594-79c7-81f8-cabd2a0fdc72" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanCapitalInvestments2025Member_019e4258-c594-7b4a-9258-29b93ba0e307" xlink:href="ugi-20260630.xsd#ugi_A2024InfrastructureReplacementAndExpansionPlanCapitalInvestments2025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanCapitalInvestments2025Member_019e4258-c594-7b4a-9258-29b93ba0e307" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanCapitalImprovements2025Through2029Member_019e4258-c594-78aa-bd4a-28cca59afa8d" xlink:href="ugi-20260630.xsd#ugi_A2024InfrastructureReplacementAndExpansionPlanCapitalImprovements2025Through2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesRegulatoryProceedingDomain_019e4258-c594-7b99-921f-6082769c87ae" xlink:to="loc_ugi_A2024InfrastructureReplacementAndExpansionPlanCapitalImprovements2025Through2029Member_019e4258-c594-78aa-bd4a-28cca59afa8d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAgencyAxis_019e4258-c594-75c5-8722-a86cb6870690" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAgencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77d4-a73a-865b5359b0fb" xlink:to="loc_us-gaap_RegulatoryAgencyAxis_019e4258-c594-75c5-8722-a86cb6870690" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAgencyDomain_019e4258-c594-75c5-8722-a86cb6870690_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAgencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RegulatoryAgencyAxis_019e4258-c594-75c5-8722-a86cb6870690" xlink:to="loc_us-gaap_RegulatoryAgencyDomain_019e4258-c594-75c5-8722-a86cb6870690_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatoryAgencyDomain_019e4258-c594-74c1-84e6-ce3af221b316" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatoryAgencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RegulatoryAgencyAxis_019e4258-c594-75c5-8722-a86cb6870690" xlink:to="loc_us-gaap_RegulatoryAgencyDomain_019e4258-c594-74c1-84e6-ce3af221b316" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PennsylvaniaPublicUtilityCommissionMember_019e4258-c594-768b-9e1b-7e88dee823b4" xlink:href="ugi-20260630.xsd#ugi_PennsylvaniaPublicUtilityCommissionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAgencyDomain_019e4258-c594-74c1-84e6-ce3af221b316" xlink:to="loc_ugi_PennsylvaniaPublicUtilityCommissionMember_019e4258-c594-768b-9e1b-7e88dee823b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PublicServiceCommissionOfWestVirginiaMember_019e4258-c594-7ab1-be4a-8b4cb7e67ebb" xlink:href="ugi-20260630.xsd#ugi_PublicServiceCommissionOfWestVirginiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatoryAgencyDomain_019e4258-c594-74c1-84e6-ce3af221b316" xlink:to="loc_ugi_PublicServiceCommissionOfWestVirginiaMember_019e4258-c594-7ab1-be4a-8b4cb7e67ebb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4258-c594-79fe-9141-f43726688417" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTable_019e4258-c594-77d4-a73a-865b5359b0fb" xlink:to="loc_dei_LegalEntityAxis_019e4258-c594-79fe-9141-f43726688417" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c594-79fe-9141-f43726688417_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4258-c594-79fe-9141-f43726688417" xlink:to="loc_dei_EntityDomain_019e4258-c594-79fe-9141-f43726688417_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c594-7c8b-ad2d-c7589f9836ec" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4258-c594-79fe-9141-f43726688417" xlink:to="loc_dei_EntityDomain_019e4258-c594-7c8b-ad2d-c7589f9836ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PAGasUtilityMember_019e4258-c594-7910-9c47-e129c6d7dd56" xlink:href="ugi-20260630.xsd#ugi_PAGasUtilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4258-c594-7c8b-ad2d-c7589f9836ec" xlink:to="loc_ugi_PAGasUtilityMember_019e4258-c594-7910-9c47-e129c6d7dd56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ElectricUtilityMember_019e4258-c594-7a2c-ad15-a3fdc68dcfed" xlink:href="ugi-20260630.xsd#ugi_ElectricUtilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4258-c594-7c8b-ad2d-c7589f9836ec" xlink:to="loc_ugi_ElectricUtilityMember_019e4258-c594-7a2c-ad15-a3fdc68dcfed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MountaineerMember_019e4258-c594-7ebc-b8b7-9a35f797d033" xlink:href="ugi-20260630.xsd#ugi_MountaineerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4258-c594-7c8b-ad2d-c7589f9836ec" xlink:to="loc_ugi_MountaineerMember_019e4258-c594-7ebc-b8b7-9a35f797d033" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019f689b-7f9e-77dc-83df-b03ad1551860" 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_PublicUtilitiesInventoryTable_019e4258-c594-77d4-a73a-865b5359b0fb" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019f689b-7f9e-77dc-83df-b03ad1551860" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019f689b-7f9e-77dc-83df-b03ad1551860_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_019f689b-7f9e-77dc-83df-b03ad1551860" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019f689b-7f9e-77dc-83df-b03ad1551860_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019f689b-7f9e-7182-be6f-9d13fbd7b2c2" 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_019f689b-7f9e-77dc-83df-b03ad1551860" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019f689b-7f9e-7182-be6f-9d13fbd7b2c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019f689b-b86b-73e7-a3c2-e988902f6220" 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_019f689b-7f9e-7182-be6f-9d13fbd7b2c2" xlink:to="loc_us-gaap_SubsequentEventMember_019f689b-b86b-73e7-a3c2-e988902f6220" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_019e4258-c594-719c-bd27-ff3613046e21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-7bfb-942d-05cd639d57e6" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_019e4258-c594-719c-bd27-ff3613046e21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_019e4258-c594-706b-97b7-d7b9e2c0a70c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-7bfb-942d-05cd639d57e6" xlink:to="loc_us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount_019e4258-c594-706b-97b7-d7b9e2c0a70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_019fca3a-24ac-79d3-84c3-7bfda4c8478d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-7bfb-942d-05cd639d57e6" xlink:to="loc_us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount_019fca3a-24ac-79d3-84c3-7bfda4c8478d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PublicUtilitiesRequestedRateChangeCapitalInvestments_019e4258-c594-7d64-86b5-90692be7b7d0" xlink:href="ugi-20260630.xsd#ugi_PublicUtilitiesRequestedRateChangeCapitalInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryLineItems_019e4258-c594-7bfb-942d-05cd639d57e6" xlink:to="loc_ugi_PublicUtilitiesRequestedRateChangeCapitalInvestments_019e4258-c594-7d64-86b5-90692be7b7d0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" 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_019e4258-c594-7ce6-9787-bb4e4b861bdc" 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_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentTable_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e889c-10d3-7a2e-ac00-03e430b63299" 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_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e889c-10d3-7a2e-ac00-03e430b63299" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7a2e-ac00-03e430b63299_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_019e889c-10d3-7a2e-ac00-03e430b63299" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7a2e-ac00-03e430b63299_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" 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_019e889c-10d3-7a2e-ac00-03e430b63299" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDue2031Member_019e889c-10d3-751d-84a2-ad948c94b7e8" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDue2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDue2031Member_019e889c-10d3-751d-84a2-ad948c94b7e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDue2027Member_019e889c-10d3-7a7d-af4a-478a0cc2e2b7" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDue2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDue2027Member_019e889c-10d3-7a7d-af4a-478a0cc2e2b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDue2028Member_019e889c-10d3-722b-a075-ef0320fffca5" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDue2028Member_019e889c-10d3-722b-a075-ef0320fffca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDueJune2026Member_019e889c-10d3-708c-ac2a-097a50dcf4ec" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDueJune2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDueJune2026Member_019e889c-10d3-708c-ac2a-097a50dcf4ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_IntercompanyLoanUGIInternationalMember_019ed362-5805-7367-a51f-bf8ede74ac28" xlink:href="ugi-20260630.xsd#ugi_IntercompanyLoanUGIInternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_IntercompanyLoanUGIInternationalMember_019ed362-5805-7367-a51f-bf8ede74ac28" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIInternationalSeniorNotesMember_019e889c-10d3-7070-ac51-adff184a0bc6" xlink:href="ugi-20260630.xsd#ugi_UGIInternationalSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_UGIInternationalSeniorNotesMember_019e889c-10d3-7070-ac51-adff184a0bc6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDue2030Member_019e889d-0805-792f-a264-5e838f6825ba" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDue2030Member_019e889d-0805-792f-a264-5e838f6825ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDue2035Member_019e889d-0805-79dd-ae10-82802428ec2c" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDue2035Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDue2035Member_019e889d-0805-79dd-ae10-82802428ec2c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SeniorNotesDueSeptember2026Member_019e889d-0805-7042-afa5-9c62f0a8309a" xlink:href="ugi-20260630.xsd#ugi_SeniorNotesDueSeptember2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_SeniorNotesDueSeptember2026Member_019e889d-0805-7042-afa5-9c62f0a8309a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIEnergyServicesAmendedTermLoanCreditAgreementMember_019f3f4d-192a-7224-b5ae-7b1e00225964" xlink:href="ugi-20260630.xsd#ugi_UGIEnergyServicesAmendedTermLoanCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_UGIEnergyServicesAmendedTermLoanCreditAgreementMember_019f3f4d-192a-7224-b5ae-7b1e00225964" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_EnergyServicesAccountsReceivableSecuritizationFacilityMember_019e889d-7925-7d1f-b57b-5fdce929c114" xlink:href="ugi-20260630.xsd#ugi_EnergyServicesAccountsReceivableSecuritizationFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_EnergyServicesAccountsReceivableSecuritizationFacilityMember_019e889d-7925-7d1f-b57b-5fdce929c114" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGICorporationSeniorNotesMember_019e889d-7925-7980-a246-dd6def2f97a1" xlink:href="ugi-20260630.xsd#ugi_UGICorporationSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_UGICorporationSeniorNotesMember_019e889d-7925-7980-a246-dd6def2f97a1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPartnersSeniorNotesMember_019f850c-9166-77e5-83da-64d47d20a488" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPartnersSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e889c-10d3-7c56-bad6-138c64c40820" xlink:to="loc_ugi_AmeriGasPartnersSeniorNotesMember_019f850c-9166-77e5-83da-64d47d20a488" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e889c-10d3-7a4f-b2a3-d0d67b46f4f3" 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_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e889c-10d3-7a4f-b2a3-d0d67b46f4f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e889c-10d3-7a4f-b2a3-d0d67b46f4f3_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_019e889c-10d3-7a4f-b2a3-d0d67b46f4f3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e889c-10d3-7a4f-b2a3-d0d67b46f4f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e889c-10d3-7965-816d-21e8f3e1b994" 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_019e889c-10d3-7a4f-b2a3-d0d67b46f4f3" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e889c-10d3-7965-816d-21e8f3e1b994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019e889c-10d3-732f-a109-df90731a52fa" 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_019e889c-10d3-7965-816d-21e8f3e1b994" xlink:to="loc_us-gaap_SeniorNotesMember_019e889c-10d3-732f-a109-df90731a52fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e889c-10d3-79ea-b81d-3c7c7d89635f" 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_019e889c-10d3-7965-816d-21e8f3e1b994" xlink:to="loc_us-gaap_LineOfCreditMember_019e889c-10d3-79ea-b81d-3c7c7d89635f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e889c-10d3-7957-ba3d-114c87df1e93" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_dei_LegalEntityAxis_019e889c-10d3-7957-ba3d-114c87df1e93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e889c-10d3-7957-ba3d-114c87df1e93_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e889c-10d3-7957-ba3d-114c87df1e93" xlink:to="loc_dei_EntityDomain_019e889c-10d3-7957-ba3d-114c87df1e93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e889c-10d3-7957-ba3d-114c87df1e93" xlink:to="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPartnersAndAmeriGasFinanceCorpsMember_019e889c-10d3-75b1-be0d-ff564c8353e2" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPartnersAndAmeriGasFinanceCorpsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:to="loc_ugi_AmeriGasPartnersAndAmeriGasFinanceCorpsMember_019e889c-10d3-75b1-be0d-ff564c8353e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPartnersMember_019e889c-10d3-7360-a4c3-4c4d72e3894d" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:to="loc_ugi_AmeriGasPartnersMember_019e889c-10d3-7360-a4c3-4c4d72e3894d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIInternationalLLCMember_019e889c-10d3-7ad7-ac9b-45ee45a9a589" xlink:href="ugi-20260630.xsd#ugi_UGIInternationalLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:to="loc_ugi_UGIInternationalLLCMember_019e889c-10d3-7ad7-ac9b-45ee45a9a589" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIUtilitiesIncMember_019e889d-0805-789b-b590-5f75c3c85255" xlink:href="ugi-20260630.xsd#ugi_UGIUtilitiesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:to="loc_ugi_UGIUtilitiesIncMember_019e889d-0805-789b-b590-5f75c3c85255" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_EnergyServicesMember_019e889d-7925-79b0-91dd-a9aea2ccf319" xlink:href="ugi-20260630.xsd#ugi_EnergyServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e889c-10d3-7d44-96ba-61ed1081ede4" xlink:to="loc_ugi_EnergyServicesMember_019e889d-7925-79b0-91dd-a9aea2ccf319" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019e4258-c668-75ce-ad71-74163787331e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_us-gaap_VariableRateAxis_019e4258-c668-75ce-ad71-74163787331e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e4258-c668-75ce-ad71-74163787331e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019e4258-c668-75ce-ad71-74163787331e" xlink:to="loc_us-gaap_VariableRateDomain_019e4258-c668-75ce-ad71-74163787331e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e4258-c668-76a3-b278-92118e519171" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019e4258-c668-75ce-ad71-74163787331e" xlink:to="loc_us-gaap_VariableRateDomain_019e4258-c668-76a3-b278-92118e519171" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e4258-c668-7121-9596-67747367711d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e4258-c668-76a3-b278-92118e519171" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e4258-c668-7121-9596-67747367711d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019f3573-fe4c-7e84-8267-0ec291f35e73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e4258-c668-76a3-b278-92118e519171" xlink:to="loc_us-gaap_BaseRateMember_019f3573-fe4c-7e84-8267-0ec291f35e73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019e889c-10d3-74bb-b9c0-39e66fa3aa54" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_srt_CounterpartyNameAxis_019e889c-10d3-74bb-b9c0-39e66fa3aa54" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e889c-10d3-74bb-b9c0-39e66fa3aa54_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019e889c-10d3-74bb-b9c0-39e66fa3aa54" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e889c-10d3-74bb-b9c0-39e66fa3aa54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e889c-10d3-78e8-9402-b19897c12616" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019e889c-10d3-74bb-b9c0-39e66fa3aa54" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e889c-10d3-78e8-9402-b19897c12616" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPartnersMember_019e889c-10d3-7a65-a41a-8db9e5971ce6" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019e889c-10d3-78e8-9402-b19897c12616" xlink:to="loc_ugi_AmeriGasPartnersMember_019e889c-10d3-7a65-a41a-8db9e5971ce6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DebtInstrumentBorrowingPeriodAxis_019e889d-7925-72f2-834e-a4a167453354" xlink:href="ugi-20260630.xsd#ugi_DebtInstrumentBorrowingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_ugi_DebtInstrumentBorrowingPeriodAxis_019e889d-7925-72f2-834e-a4a167453354" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DebtInstrumentBorrowingPeriodDomain_019e889d-7925-72f2-834e-a4a167453354_default" xlink:href="ugi-20260630.xsd#ugi_DebtInstrumentBorrowingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ugi_DebtInstrumentBorrowingPeriodAxis_019e889d-7925-72f2-834e-a4a167453354" xlink:to="loc_ugi_DebtInstrumentBorrowingPeriodDomain_019e889d-7925-72f2-834e-a4a167453354_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DebtInstrumentBorrowingPeriodDomain_019e889d-7925-7fa6-8834-05608a9d7130" xlink:href="ugi-20260630.xsd#ugi_DebtInstrumentBorrowingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ugi_DebtInstrumentBorrowingPeriodAxis_019e889d-7925-72f2-834e-a4a167453354" xlink:to="loc_ugi_DebtInstrumentBorrowingPeriodDomain_019e889d-7925-7fa6-8834-05608a9d7130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PeriodOctober182024ToApril302025Member_019e889d-7925-75b0-aa3f-6c48519a7878" xlink:href="ugi-20260630.xsd#ugi_PeriodOctober182024ToApril302025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_DebtInstrumentBorrowingPeriodDomain_019e889d-7925-7fa6-8834-05608a9d7130" xlink:to="loc_ugi_PeriodOctober182024ToApril302025Member_019e889d-7925-75b0-aa3f-6c48519a7878" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_PeriodMay12025ToOctober172025Member_019e889d-7925-7687-a75b-3acef6b6d6ad" xlink:href="ugi-20260630.xsd#ugi_PeriodMay12025ToOctober172025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ugi_DebtInstrumentBorrowingPeriodDomain_019e889d-7925-7fa6-8834-05608a9d7130" xlink:to="loc_ugi_PeriodMay12025ToOctober172025Member_019e889d-7925-7687-a75b-3acef6b6d6ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_019e889d-7925-7b66-b652-4c61f98427d9" 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_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_019e889d-7925-7b66-b652-4c61f98427d9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019e889d-7925-7b66-b652-4c61f98427d9_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_019e889d-7925-7b66-b652-4c61f98427d9" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019e889d-7925-7b66-b652-4c61f98427d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019e889d-7925-7ab0-b6ee-2cec3a233cad" 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_019e889d-7925-7b66-b652-4c61f98427d9" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019e889d-7925-7ab0-b6ee-2cec3a233cad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ReceivablesFacilityMember_019e889d-7925-7a04-b767-4a69924260be" xlink:href="ugi-20260630.xsd#ugi_ReceivablesFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_019e889d-7925-7ab0-b6ee-2cec3a233cad" xlink:to="loc_ugi_ReceivablesFacilityMember_019e889d-7925-7a04-b767-4a69924260be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e889e-61eb-757d-83a6-419b06ccaaf6" 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_DebtInstrumentTable_019e4258-c594-7ce6-9787-bb4e4b861bdc" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e889e-61eb-757d-83a6-419b06ccaaf6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e889e-61eb-757d-83a6-419b06ccaaf6_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_019e889e-61eb-757d-83a6-419b06ccaaf6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e889e-61eb-757d-83a6-419b06ccaaf6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e889e-61eb-77f3-9e67-cd9026c0ba89" 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_019e889e-61eb-757d-83a6-419b06ccaaf6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e889e-61eb-77f3-9e67-cd9026c0ba89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e889e-61eb-79dd-a304-1362892701c1" 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_019e889e-61eb-77f3-9e67-cd9026c0ba89" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e889e-61eb-79dd-a304-1362892701c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e889c-10d3-795e-8c32-7f27ceedaa48" 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_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e889c-10d3-795e-8c32-7f27ceedaa48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e889c-10d3-701a-87b0-035c7d0e501a" 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_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e889c-10d3-701a-87b0-035c7d0e501a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromContributionsFromParent_019ed54f-71b6-700c-9850-60c34fe8e7e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromContributionsFromParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_ProceedsFromContributionsFromParent_019ed54f-71b6-700c-9850-60c34fe8e7e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019e889c-10d3-7334-9e1e-265d7fd32bea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_019e889c-10d3-7334-9e1e-265d7fd32bea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepaidPrincipal_019ed55c-bfd5-7b8e-8cd5-a9e525ab9252" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentRepaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentRepaidPrincipal_019ed55c-bfd5-7b8e-8cd5-a9e525ab9252" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019f3f4e-ddc1-7284-b8d9-a2dc80aca8b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019f3f4e-ddc1-7284-b8d9-a2dc80aca8b1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ReceivablesFacilityMaximumBorrowingCapacity_019e889d-7925-758a-aee3-5f01267be2a0" xlink:href="ugi-20260630.xsd#ugi_ReceivablesFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_ugi_ReceivablesFacilityMaximumBorrowingCapacity_019e889d-7925-758a-aee3-5f01267be2a0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_ReceivablesFacilityAccordionFeatureIncreaseLimit_019e889d-7925-72e9-940d-6777d420f158" xlink:href="ugi-20260630.xsd#ugi_ReceivablesFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_ugi_ReceivablesFacilityAccordionFeatureIncreaseLimit_019e889d-7925-72e9-940d-6777d420f158" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_019e889d-c6a2-754d-8576-62a6c48353f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio1_019e889d-c6a2-754d-8576-62a6c48353f8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DebtInstrumentConvertibleDefaultConversionRatio_019e889d-c6a2-7454-ab0c-7b7fecfae993" xlink:href="ugi-20260630.xsd#ugi_DebtInstrumentConvertibleDefaultConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_ugi_DebtInstrumentConvertibleDefaultConversionRatio_019e889d-c6a2-7454-ab0c-7b7fecfae993" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019e889e-2bf8-7cb0-bb74-084996fb8d9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_InterestExpenseDebt_019e889e-2bf8-7cb0-bb74-084996fb8d9b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e889e-61eb-71eb-9574-6edacf624019" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_DebtInstrumentInterestRateDuringPeriod_019e889e-61eb-71eb-9574-6edacf624019" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019e889e-61eb-7e14-9095-58e399aa40d9" 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_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_LongTermDebtFairValue_019e889e-61eb-7e14-9095-58e399aa40d9" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019f6416-7834-71d9-bd42-fd42c69e13cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019f6416-7834-71d9-bd42-fd42c69e13cb" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromShortTermDebtMaturingInThreeMonthsOrLess_019e889e-61eb-790e-9a3b-371db3dbbcf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromShortTermDebtMaturingInThreeMonthsOrLess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_ProceedsFromShortTermDebtMaturingInThreeMonthsOrLess_019e889e-61eb-790e-9a3b-371db3dbbcf8" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess_019e889e-61eb-74ff-99bd-89854b62d17b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e889c-10d3-7de9-9ad7-c09543886d98" xlink:to="loc_us-gaap_RepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess_019e889e-61eb-74ff-99bd-89854b62d17b" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" 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_019e4258-c668-74e3-9385-421a264783b7" 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_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_us-gaap_LossContingenciesTable_019e4258-c668-74e3-9385-421a264783b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e4258-c668-703e-b19b-c110865f641b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e4258-c668-74e3-9385-421a264783b7" xlink:to="loc_dei_LegalEntityAxis_019e4258-c668-703e-b19b-c110865f641b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c668-703e-b19b-c110865f641b_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e4258-c668-703e-b19b-c110865f641b" xlink:to="loc_dei_EntityDomain_019e4258-c668-703e-b19b-c110865f641b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e4258-c668-751c-bca0-a7b0e9a182bc" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e4258-c668-703e-b19b-c110865f641b" xlink:to="loc_dei_EntityDomain_019e4258-c668-751c-bca0-a7b0e9a182bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIUtilitiesIncMember_019e4258-c668-7c7a-ba6a-259aa9032972" xlink:href="ugi-20260630.xsd#ugi_UGIUtilitiesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4258-c668-751c-bca0-a7b0e9a182bc" xlink:to="loc_ugi_UGIUtilitiesIncMember_019e4258-c668-7c7a-ba6a-259aa9032972" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasOLPMember_019e4258-c668-72f0-8150-083c38950d04" xlink:href="ugi-20260630.xsd#ugi_AmeriGasOLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e4258-c668-751c-bca0-a7b0e9a182bc" xlink:to="loc_ugi_AmeriGasOLPMember_019e4258-c668-72f0-8150-083c38950d04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteAxis_019e4258-c668-7d83-a016-072ca858a716" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationSiteAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e4258-c668-74e3-9385-421a264783b7" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteAxis_019e4258-c668-7d83-a016-072ca858a716" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_019e4258-c668-7d83-a016-072ca858a716_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_019e4258-c668-7d83-a016-072ca858a716" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_019e4258-c668-7d83-a016-072ca858a716_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationSiteDomain_019e4258-c668-7c83-9c10-18f5ebfaba68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationSiteDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteAxis_019e4258-c668-7d83-a016-072ca858a716" xlink:to="loc_us-gaap_EnvironmentalRemediationSiteDomain_019e4258-c668-7c83-9c10-18f5ebfaba68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SpecifiedFormerMGPSitesInPennsylvaniaMember_019e4258-c668-77ad-8c28-b5dedab2e1d7" xlink:href="ugi-20260630.xsd#ugi_SpecifiedFormerMGPSitesInPennsylvaniaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_019e4258-c668-7c83-9c10-18f5ebfaba68" xlink:to="loc_ugi_SpecifiedFormerMGPSitesInPennsylvaniaMember_019e4258-c668-77ad-8c28-b5dedab2e1d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_SaranacLakeNewYorkMember_019e4258-c668-7a7c-a81b-7038cd1fc60b" xlink:href="ugi-20260630.xsd#ugi_SaranacLakeNewYorkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationSiteDomain_019e4258-c668-7c83-9c10-18f5ebfaba68" xlink:to="loc_ugi_SaranacLakeNewYorkMember_019e4258-c668-7a7c-a81b-7038cd1fc60b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationContingencyAxis_019e4258-c668-70d3-845e-ab60f93e2680" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019e4258-c668-74e3-9385-421a264783b7" xlink:to="loc_us-gaap_EnvironmentalRemediationContingencyAxis_019e4258-c668-70d3-845e-ab60f93e2680" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationContingencyDomain_019e4258-c668-70d3-845e-ab60f93e2680_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationContingencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyAxis_019e4258-c668-70d3-845e-ab60f93e2680" xlink:to="loc_us-gaap_EnvironmentalRemediationContingencyDomain_019e4258-c668-70d3-845e-ab60f93e2680_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationContingencyDomain_019e4258-c668-7f06-8bef-ff1c4cb40370" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationContingencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyAxis_019e4258-c668-70d3-845e-ab60f93e2680" xlink:to="loc_us-gaap_EnvironmentalRemediationContingencyDomain_019e4258-c668-7f06-8bef-ff1c4cb40370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NewYorkStateDepartmentOfEnvironmentConservationRecordOfDecisionMember_019e4258-c668-7f8c-b48b-16919e4486f3" xlink:href="ugi-20260630.xsd#ugi_NewYorkStateDepartmentOfEnvironmentConservationRecordOfDecisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyDomain_019e4258-c668-7f06-8bef-ff1c4cb40370" xlink:to="loc_ugi_NewYorkStateDepartmentOfEnvironmentConservationRecordOfDecisionMember_019e4258-c668-7f8c-b48b-16919e4486f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NewYorkStateDepartmentofEnvironmentConservationRemediationPlanMember_019e4258-c668-7ec7-9306-07b577e92f7f" xlink:href="ugi-20260630.xsd#ugi_NewYorkStateDepartmentofEnvironmentConservationRemediationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyDomain_019e4258-c668-7f06-8bef-ff1c4cb40370" xlink:to="loc_ugi_NewYorkStateDepartmentofEnvironmentConservationRemediationPlanMember_019e4258-c668-7ec7-9306-07b577e92f7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e4258-c668-7f46-9635-a379cfe73bcd" 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_019e4258-c668-74e3-9385-421a264783b7" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019e4258-c668-7f46-9635-a379cfe73bcd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019e4258-c668-7f46-9635-a379cfe73bcd_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_019e4258-c668-7f46-9635-a379cfe73bcd" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019e4258-c668-7f46-9635-a379cfe73bcd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019e4258-c668-76d2-ac2c-9f6d651d9ea5" 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_019e4258-c668-7f46-9635-a379cfe73bcd" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019e4258-c668-76d2-ac2c-9f6d651d9ea5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DamageFromFireExplosionOrOtherHazardMember_019e4258-c668-7e74-8cbd-efd9584f34be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DamageFromFireExplosionOrOtherHazardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019e4258-c668-76d2-ac2c-9f6d651d9ea5" xlink:to="loc_us-gaap_DamageFromFireExplosionOrOtherHazardMember_019e4258-c668-7e74-8cbd-efd9584f34be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NumberofSubsidiariesAcquired_019e4258-c668-799b-84bb-1ec5ef8ccc99" xlink:href="ugi-20260630.xsd#ugi_NumberofSubsidiariesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_ugi_NumberofSubsidiariesAcquired_019e4258-c668-799b-84bb-1ec5ef8ccc99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_EnvironmentalExpendituresCapDuringCalendarYear_019e4258-c668-7073-9c92-e5ead9bf4b2f" xlink:href="ugi-20260630.xsd#ugi_EnvironmentalExpendituresCapDuringCalendarYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_ugi_EnvironmentalExpendituresCapDuringCalendarYear_019e4258-c668-7073-9c92-e5ead9bf4b2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingencies_019e4258-c668-74e4-b91e-29b404c72e82" 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_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingencies_019e4258-c668-74e4-b91e-29b404c72e82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_LossContingencyRemediationPlansNumberOfDecisions_019e4258-c668-7b38-ad6e-08e490f7922b" xlink:href="ugi-20260630.xsd#ugi_LossContingencyRemediationPlansNumberOfDecisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_ugi_LossContingencyRemediationPlansNumberOfDecisions_019e4258-c668-7b38-ad6e-08e490f7922b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_019e4258-c668-7847-a091-19fd09d51cdc" 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_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_019e4258-c668-7847-a091-19fd09d51cdc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationExpense_019e4258-c668-7cda-a2a3-2a27884c5655" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EnvironmentalRemediationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_us-gaap_EnvironmentalRemediationExpense_019e4258-c668-7cda-a2a3-2a27884c5655" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NumberOfFatalities_019e4258-c668-7aa3-94a4-1073b19baaa5" xlink:href="ugi-20260630.xsd#ugi_NumberOfFatalities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_ugi_NumberOfFatalities_019e4258-c668-7aa3-94a4-1073b19baaa5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NumberOfInjuries_019e4258-c668-7a89-b761-229e33451f18" xlink:href="ugi-20260630.xsd#ugi_NumberOfInjuries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019e4258-c668-75a0-9328-3811e93de27e" xlink:to="loc_ugi_NumberOfInjuries_019e4258-c668-7a89-b761-229e33451f18" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/FairValueMeasurementsScheduleofFinancialAssetsandLiabilitiesthatareMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#FairValueMeasurementsScheduleofFinancialAssetsandLiabilitiesthatareMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/FairValueMeasurementsScheduleofFinancialAssetsandLiabilitiesthatareMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4258-c668-72d2-9e86-d3fd4acc3171" 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_019e4258-c668-7450-9d00-9b31fd4d257d" 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_019e4258-c668-72d2-9e86-d3fd4acc3171" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e4258-c668-7450-9d00-9b31fd4d257d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4258-c668-7f34-9640-248531a64471" 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_019e4258-c668-7450-9d00-9b31fd4d257d" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019e4258-c668-7f34-9640-248531a64471" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4258-c668-7f34-9640-248531a64471_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_019e4258-c668-7f34-9640-248531a64471" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4258-c668-7f34-9640-248531a64471_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4258-c668-7c6d-9fbc-1870c84f3c67" 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_019e4258-c668-7f34-9640-248531a64471" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019e4258-c668-7c6d-9fbc-1870c84f3c67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019e4258-c668-75db-a43f-d336f15df9de" 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_019e4258-c668-7c6d-9fbc-1870c84f3c67" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019e4258-c668-75db-a43f-d336f15df9de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019e4258-c668-729a-bf93-ecc20db22d56" 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_019e4258-c668-7c6d-9fbc-1870c84f3c67" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019e4258-c668-729a-bf93-ecc20db22d56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019e4258-c668-734c-a67b-6efda908df23" 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_019e4258-c668-7c6d-9fbc-1870c84f3c67" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019e4258-c668-734c-a67b-6efda908df23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-7252-9c9d-c1a339db347c" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019e4258-c668-7450-9d00-9b31fd4d257d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-7252-9c9d-c1a339db347c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7252-9c9d-c1a339db347c_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_019e4258-c668-7252-9c9d-c1a339db347c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7252-9c9d-c1a339db347c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7750-a55a-45af5016fd61" 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_019e4258-c668-7252-9c9d-c1a339db347c" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7750-a55a-45af5016fd61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e4258-c668-7143-92af-0dee807ec9a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7750-a55a-45af5016fd61" xlink:to="loc_us-gaap_CommodityContractMember_019e4258-c668-7143-92af-0dee807ec9a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e4258-c668-79ff-a554-5b75190884fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7750-a55a-45af5016fd61" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e4258-c668-79ff-a554-5b75190884fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e4258-c668-73d3-b175-1c1fce1c00fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7750-a55a-45af5016fd61" xlink:to="loc_us-gaap_InterestRateContractMember_019e4258-c668-73d3-b175-1c1fce1c00fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e4258-c668-7d7b-9c45-29a42f216bbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4258-c668-72d2-9e86-d3fd4acc3171" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e4258-c668-7d7b-9c45-29a42f216bbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e4258-c668-7c85-81c7-8c618ba06628" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4258-c668-72d2-9e86-d3fd4acc3171" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e4258-c668-7c85-81c7-8c618ba06628" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NonqualifiedSupplementalExecutiveRetirementPlan_019e4258-c668-7b0b-b2d7-5fa4adfdd75f" xlink:href="ugi-20260630.xsd#ugi_NonqualifiedSupplementalExecutiveRetirementPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019e4258-c668-72d2-9e86-d3fd4acc3171" xlink:to="loc_ugi_NonqualifiedSupplementalExecutiveRetirementPlan_019e4258-c668-7b0b-b2d7-5fa4adfdd75f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/FairValueMeasurementsScheduleofCarryingAmountsandEstimatedFairValuesofLongtermDebtDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#FairValueMeasurementsScheduleofCarryingAmountsandEstimatedFairValuesofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/FairValueMeasurementsScheduleofCarryingAmountsandEstimatedFairValuesofLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e4258-c668-7b37-89f8-a1b6769fe4c4" 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_019e4258-c668-7318-9f47-35698763a861" 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_019e4258-c668-7b37-89f8-a1b6769fe4c4" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e4258-c668-7318-9f47-35698763a861" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019e4258-c668-7839-88a4-f20de8d34fec" 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_019e4258-c668-7318-9f47-35698763a861" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019e4258-c668-7839-88a4-f20de8d34fec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4258-c668-7839-88a4-f20de8d34fec_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_019e4258-c668-7839-88a4-f20de8d34fec" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4258-c668-7839-88a4-f20de8d34fec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e4258-c668-771a-8261-0dd702741d60" 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_019e4258-c668-7839-88a4-f20de8d34fec" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019e4258-c668-771a-8261-0dd702741d60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4258-c668-7637-bd5c-95eb0dfd6b10" 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_019e4258-c668-771a-8261-0dd702741d60" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019e4258-c668-7637-bd5c-95eb0dfd6b10" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e4258-c668-797b-8425-bf8b92dc42b6" 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_019e4258-c668-7637-bd5c-95eb0dfd6b10" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019e4258-c668-797b-8425-bf8b92dc42b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e4258-c668-7e13-9126-d81554e12656" 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_019e4258-c668-7637-bd5c-95eb0dfd6b10" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019e4258-c668-7e13-9126-d81554e12656" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_019e4258-c668-7ada-afe1-ae8adde3d164" 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_019e4258-c668-7b37-89f8-a1b6769fe4c4" xlink:to="loc_us-gaap_LongTermDebtFairValue_019e4258-c668-7ada-afe1-ae8adde3d164" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e4258-c668-7466-9266-672fefa88843" 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_019e4258-c668-7944-8713-da95f92faffa" 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_019e4258-c668-7466-9266-672fefa88843" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e4258-c668-7944-8713-da95f92faffa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019e4258-c668-789e-9ca1-e3df0d967602" 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_FairValueByBalanceSheetGroupingTable_019e4258-c668-7944-8713-da95f92faffa" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019e4258-c668-789e-9ca1-e3df0d967602" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c668-789e-9ca1-e3df0d967602_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_019e4258-c668-789e-9ca1-e3df0d967602" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c668-789e-9ca1-e3df0d967602_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c668-74b6-a6f4-bdb6eb767873" 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_019e4258-c668-789e-9ca1-e3df0d967602" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c668-74b6-a6f4-bdb6eb767873" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019e4258-c668-7ef2-90ef-b1321f84db6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019e4258-c668-74b6-a6f4-bdb6eb767873" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_019e4258-c668-7ef2-90ef-b1321f84db6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e4258-c668-72d5-a144-48c739bef158" 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_FairValueByBalanceSheetGroupingTable_019e4258-c668-7944-8713-da95f92faffa" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019e4258-c668-72d5-a144-48c739bef158" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c668-72d5-a144-48c739bef158_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_019e4258-c668-72d5-a144-48c739bef158" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c668-72d5-a144-48c739bef158_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c668-7e16-8913-e6122c3000c7" 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_019e4258-c668-72d5-a144-48c739bef158" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c668-7e16-8913-e6122c3000c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_LPGDistributionBusinessesCzechRepublicHungaryPolandAndSlovakiaMember_019e4258-c668-7a85-a9f6-8fea9b34b765" xlink:href="ugi-20260630.xsd#ugi_LPGDistributionBusinessesCzechRepublicHungaryPolandAndSlovakiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019e4258-c668-7e16-8913-e6122c3000c7" xlink:to="loc_ugi_LPGDistributionBusinessesCzechRepublicHungaryPolandAndSlovakiaMember_019e4258-c668-7a85-a9f6-8fea9b34b765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax_019e4258-c668-7c2d-849e-158f3e4b943f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e4258-c668-7466-9266-672fefa88843" xlink:to="loc_us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax_019e4258-c668-7c2d-849e-158f3e4b943f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesNarrativeDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DerivativeInstrumentsandHedgingActivitiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e4258-c668-7e44-b351-dac67654a1e4" 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_019e4258-c668-76d5-b914-69526c8600f8" 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_019e4258-c668-7e44-b351-dac67654a1e4" xlink:to="loc_us-gaap_DerivativeTable_019e4258-c668-76d5-b914-69526c8600f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-731b-bd00-655608072806" 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_019e4258-c668-76d5-b914-69526c8600f8" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-731b-bd00-655608072806" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-731b-bd00-655608072806_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_019e4258-c668-731b-bd00-655608072806" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-731b-bd00-655608072806_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7540-b919-e83134de672e" 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_019e4258-c668-731b-bd00-655608072806" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7540-b919-e83134de672e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_InterestRateProtectionAgreementsMember_019e4258-c668-7dad-bc04-ac7251c0ed5d" xlink:href="ugi-20260630.xsd#ugi_InterestRateProtectionAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7540-b919-e83134de672e" xlink:to="loc_ugi_InterestRateProtectionAgreementsMember_019e4258-c668-7dad-bc04-ac7251c0ed5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019e4258-c668-7e1e-a635-2b15ec96a72d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7540-b919-e83134de672e" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019e4258-c668-7e1e-a635-2b15ec96a72d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e4258-c668-7355-8103-f6fe9df8c110" 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_019e4258-c668-7e44-b351-dac67654a1e4" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e4258-c668-7355-8103-f6fe9df8c110" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_DerivativeNotionalAmountPercentOfRequiredNeedCoverage_019e4258-c668-7553-a529-e135eef0d6df" xlink:href="ugi-20260630.xsd#ugi_DerivativeNotionalAmountPercentOfRequiredNeedCoverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4258-c668-7e44-b351-dac67654a1e4" xlink:to="loc_ugi_DerivativeNotionalAmountPercentOfRequiredNeedCoverage_019e4258-c668-7553-a529-e135eef0d6df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax_019e4258-c668-7633-a1ef-7073d8240cc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4258-c668-7e44-b351-dac67654a1e4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossReclassificationBeforeTax_019e4258-c668-7633-a1ef-7073d8240cc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativeMaximumExposureUndiscounted_019e4258-c668-7e44-b3b4-5e97f70ecd93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDerivativeMaximumExposureUndiscounted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4258-c668-7e44-b351-dac67654a1e4" xlink:to="loc_us-gaap_CreditDerivativeMaximumExposureUndiscounted_019e4258-c668-7e44-b3b4-5e97f70ecd93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_019e4258-c668-7f3f-89ed-feb6c89e8052" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralObligationToReturnCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4258-c668-7e44-b351-dac67654a1e4" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_019e4258-c668-7f3f-89ed-feb6c89e8052" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DerivativeInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofNotionalAmountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019e4258-c668-7832-b1fa-28f56f863c37" 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_019e4258-c668-7350-8552-44988b02815d" 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_019e4258-c668-7832-b1fa-28f56f863c37" xlink:to="loc_us-gaap_DerivativeTable_019e4258-c668-7350-8552-44988b02815d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-73a3-bca3-7a3d844ff023" 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_019e4258-c668-7350-8552-44988b02815d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-73a3-bca3-7a3d844ff023" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-73a3-bca3-7a3d844ff023_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_019e4258-c668-73a3-bca3-7a3d844ff023" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-73a3-bca3-7a3d844ff023_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-77b7-89cb-47b122cdb7ab" 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_019e4258-c668-73a3-bca3-7a3d844ff023" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-77b7-89cb-47b122cdb7ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e4258-c668-7e0b-9103-995724a0b6c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-77b7-89cb-47b122cdb7ab" xlink:to="loc_us-gaap_CommodityContractMember_019e4258-c668-7e0b-9103-995724a0b6c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NaturalGasFuturesForwardAndPipelineContractsMember_019e4258-c668-7bdd-9b3a-b97c5f9f8c4e" xlink:href="ugi-20260630.xsd#ugi_NaturalGasFuturesForwardAndPipelineContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-77b7-89cb-47b122cdb7ab" xlink:to="loc_ugi_NaturalGasFuturesForwardAndPipelineContractsMember_019e4258-c668-7bdd-9b3a-b97c5f9f8c4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019e4258-c668-7128-aaf3-dd59517a2fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-77b7-89cb-47b122cdb7ab" xlink:to="loc_us-gaap_InterestRateSwapMember_019e4258-c668-7128-aaf3-dd59517a2fe2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e4258-c668-76bd-b93f-849308e84308" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-77b7-89cb-47b122cdb7ab" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e4258-c668-76bd-b93f-849308e84308" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis_019e4258-c668-717a-b66c-16cb5148b920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e4258-c668-7350-8552-44988b02815d" xlink:to="loc_us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis_019e4258-c668-717a-b66c-16cb5148b920" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatedAndUnregulatedOperationDomain_019e4258-c668-717a-b66c-16cb5148b920_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatedAndUnregulatedOperationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis_019e4258-c668-717a-b66c-16cb5148b920" xlink:to="loc_us-gaap_RegulatedAndUnregulatedOperationDomain_019e4258-c668-717a-b66c-16cb5148b920_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatedAndUnregulatedOperationDomain_019e4258-c668-7852-9af7-3c46b43fed7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatedAndUnregulatedOperationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PublicUtilityRegulatedOrUnregulatedStatusAxis_019e4258-c668-717a-b66c-16cb5148b920" xlink:to="loc_us-gaap_RegulatedAndUnregulatedOperationDomain_019e4258-c668-7852-9af7-3c46b43fed7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RegulatedOperationMember_019e4258-c668-7bc7-af3b-98e8b8c6c019" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RegulatedOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatedAndUnregulatedOperationDomain_019e4258-c668-7852-9af7-3c46b43fed7c" xlink:to="loc_us-gaap_RegulatedOperationMember_019e4258-c668-7bc7-af3b-98e8b8c6c019" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnregulatedOperationMember_019e4258-c668-7f2d-a4aa-fd67035b5036" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnregulatedOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RegulatedAndUnregulatedOperationDomain_019e4258-c668-7852-9af7-3c46b43fed7c" xlink:to="loc_us-gaap_UnregulatedOperationMember_019e4258-c668-7f2d-a4aa-fd67035b5036" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyAxis_019e4258-c668-7e9a-b677-88656ac4a406" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019e4258-c668-7350-8552-44988b02815d" xlink:to="loc_srt_EnergyAxis_019e4258-c668-7e9a-b677-88656ac4a406" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e4258-c668-7e9a-b677-88656ac4a406_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_EnergyAxis_019e4258-c668-7e9a-b677-88656ac4a406" xlink:to="loc_srt_EnergyDomain_019e4258-c668-7e9a-b677-88656ac4a406_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EnergyDomain_019e4258-c668-7019-a331-2a7738461012" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_EnergyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_EnergyAxis_019e4258-c668-7e9a-b677-88656ac4a406" xlink:to="loc_srt_EnergyDomain_019e4258-c668-7019-a331-2a7738461012" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_NaturalGasMember_019e4258-c668-7e75-8d5d-38f7eece35ea" xlink:href="ugi-20260630.xsd#ugi_NaturalGasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e4258-c668-7019-a331-2a7738461012" xlink:to="loc_ugi_NaturalGasMember_019e4258-c668-7e75-8d5d-38f7eece35ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryPropaneMember_019e4258-c668-73eb-8a10-6064f5b92c70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PublicUtilitiesInventoryPropaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e4258-c668-7019-a331-2a7738461012" xlink:to="loc_us-gaap_PublicUtilitiesInventoryPropaneMember_019e4258-c668-73eb-8a10-6064f5b92c70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ElectricityMember_019e4258-c668-7d85-b991-234c9d83257b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ElectricityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EnergyDomain_019e4258-c668-7019-a331-2a7738461012" xlink:to="loc_us-gaap_ElectricityMember_019e4258-c668-7d85-b991-234c9d83257b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_019e4258-c668-71f9-9670-17c7538edc3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4258-c668-7832-b1fa-28f56f863c37" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_019e4258-c668-71f9-9670-17c7538edc3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_019e4258-c668-7f2e-9a45-967ad4d6ab13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019e4258-c668-7832-b1fa-28f56f863c37" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_019e4258-c668-7f2e-9a45-967ad4d6ab13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019e4258-c668-77d6-a3a5-a89acbcee774" 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_019e4258-c668-7832-b1fa-28f56f863c37" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019e4258-c668-77d6-a3a5-a89acbcee774" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofFairValueofDerivativeAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DerivativeInstrumentsandHedgingActivitiesScheduleofFairValueofDerivativeAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofFairValueofDerivativeAssetsandLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019e4258-c669-7856-920c-0f02601a66a2" 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_019e4258-c668-7faa-a564-cc2632581130" 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_019e4258-c669-7856-920c-0f02601a66a2" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e4258-c668-7faa-a564-cc2632581130" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e4258-c668-7a0a-be58-9a8ebf25f711" 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_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019e4258-c668-7faa-a564-cc2632581130" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e4258-c668-7a0a-be58-9a8ebf25f711" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4258-c668-7a0a-be58-9a8ebf25f711_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_019e4258-c668-7a0a-be58-9a8ebf25f711" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4258-c668-7a0a-be58-9a8ebf25f711_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4258-c668-7f22-9bd6-83c6d4241b4e" 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_019e4258-c668-7a0a-be58-9a8ebf25f711" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4258-c668-7f22-9bd6-83c6d4241b4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4258-c668-7b31-8239-aff4603a6bcc" 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_019e4258-c668-7f22-9bd6-83c6d4241b4e" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4258-c668-7b31-8239-aff4603a6bcc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019e4258-c668-7238-87f9-e416f54987a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e4258-c668-7f22-9bd6-83c6d4241b4e" xlink:to="loc_us-gaap_NondesignatedMember_019e4258-c668-7238-87f9-e416f54987a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-7a0e-bb81-edb4d6675038" 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_019e4258-c668-7faa-a564-cc2632581130" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c668-7a0e-bb81-edb4d6675038" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7a0e-bb81-edb4d6675038_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_019e4258-c668-7a0e-bb81-edb4d6675038" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7a0e-bb81-edb4d6675038_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7d60-9636-a58fcce19b11" 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_019e4258-c668-7a0e-bb81-edb4d6675038" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7d60-9636-a58fcce19b11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e4258-c669-7c84-963c-3dbfec047dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7d60-9636-a58fcce19b11" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e4258-c669-7c84-963c-3dbfec047dbc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e4258-c669-7672-b3c1-6e467a213c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7d60-9636-a58fcce19b11" xlink:to="loc_us-gaap_InterestRateContractMember_019e4258-c669-7672-b3c1-6e467a213c0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e4258-c669-701c-92b6-5369c98486a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c668-7d60-9636-a58fcce19b11" xlink:to="loc_us-gaap_CommodityContractMember_019e4258-c669-701c-92b6-5369c98486a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_019e4258-c669-77c4-b477-f5a448ae93d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e4258-c669-7856-920c-0f02601a66a2" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_019e4258-c669-77c4-b477-f5a448ae93d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e4258-c669-70e4-8aa2-447920bd9d8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e4258-c669-77c4-b477-f5a448ae93d4" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019e4258-c669-70e4-8aa2-447920bd9d8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019e4258-c669-7ced-a643-6b2b5c8f5a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e4258-c669-77c4-b477-f5a448ae93d4" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_019e4258-c669-7ced-a643-6b2b5c8f5a3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralObligationToReturnCash_019e4258-c669-74b0-a598-55fe07070569" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralObligationToReturnCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e4258-c669-77c4-b477-f5a448ae93d4" xlink:to="loc_us-gaap_DerivativeCollateralObligationToReturnCash_019e4258-c669-74b0-a598-55fe07070569" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019e4258-c669-7890-aeca-870f9679d2d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019e4258-c669-77c4-b477-f5a448ae93d4" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019e4258-c669-7890-aeca-870f9679d2d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_019e4258-c669-78ed-9683-da8c87d69cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019e4258-c669-7856-920c-0f02601a66a2" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_019e4258-c669-78ed-9683-da8c87d69cc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e4258-c669-769f-af94-a8b9f6ebf659" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e4258-c669-78ed-9683-da8c87d69cc6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019e4258-c669-769f-af94-a8b9f6ebf659" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019e4258-c669-7387-9fb3-82e0c4eb14f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e4258-c669-78ed-9683-da8c87d69cc6" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_019e4258-c669-7387-9fb3-82e0c4eb14f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeCollateralRightToReclaimCash_019e4258-c669-7b61-b25d-40acfc1e8fbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeCollateralRightToReclaimCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e4258-c669-78ed-9683-da8c87d69cc6" xlink:to="loc_us-gaap_DerivativeCollateralRightToReclaimCash_019e4258-c669-7b61-b25d-40acfc1e8fbb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_019e4258-c669-7a15-bbc9-ac9df3eb0836" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019e4258-c669-78ed-9683-da8c87d69cc6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral_019e4258-c669-7a15-bbc9-ac9df3eb0836" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofEffectsofDerivativeInstrumentsontheCondensedConsolidatedStatementsofIncomeandChangesinAOCIDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#DerivativeInstrumentsandHedgingActivitiesScheduleofEffectsofDerivativeInstrumentsontheCondensedConsolidatedStatementsofIncomeandChangesinAOCIDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofEffectsofDerivativeInstrumentsontheCondensedConsolidatedStatementsofIncomeandChangesinAOCIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" 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_019e4258-c669-7d91-aebf-04f46e11506c" 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_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4258-c669-7d91-aebf-04f46e11506c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c669-7ad4-ab06-fd9778a5b965" 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_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c669-7ad4-ab06-fd9778a5b965" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-7ad4-ab06-fd9778a5b965_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_019e4258-c669-7ad4-ab06-fd9778a5b965" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-7ad4-ab06-fd9778a5b965_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" 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_019e4258-c669-7ad4-ab06-fd9778a5b965" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e4258-c669-756e-b60c-aef7513845f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:to="loc_us-gaap_InterestRateContractMember_019e4258-c669-756e-b60c-aef7513845f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e4258-c669-7a15-8b14-24c834a99d77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:to="loc_us-gaap_CommodityContractMember_019e4258-c669-7a15-8b14-24c834a99d77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e4258-c669-722b-87f6-3c5fec46f485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e4258-c669-722b-87f6-3c5fec46f485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e4258-c669-7920-9a1d-735100d9a1c7" 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_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e4258-c669-7920-9a1d-735100d9a1c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-7920-9a1d-735100d9a1c7_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_019e4258-c669-7920-9a1d-735100d9a1c7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-7920-9a1d-735100d9a1c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-72e2-bbda-150bcb20d035" 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_019e4258-c669-7920-9a1d-735100d9a1c7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-72e2-bbda-150bcb20d035" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4258-c669-7201-aeca-5b99a5f56ff2" 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_019e4258-c669-72e2-bbda-150bcb20d035" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4258-c669-7201-aeca-5b99a5f56ff2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019e4258-c669-782b-80c6-7c337a35ce34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-72e2-bbda-150bcb20d035" xlink:to="loc_us-gaap_NondesignatedMember_019e4258-c669-782b-80c6-7c337a35ce34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e4258-c669-7df8-89ae-c111d3d87234" 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_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019e4258-c669-7df8-89ae-c111d3d87234" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-73a1-b006-65ef014b34bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-73a1-b006-65ef014b34bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019e4258-c669-7ce1-a866-2a8c1b80d61d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:to="loc_us-gaap_CashFlowHedgingMember_019e4258-c669-7ce1-a866-2a8c1b80d61d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019e4258-c669-791c-b590-d54584738c80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019e4258-c669-791c-b590-d54584738c80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7e2b-91ac-d6a4390cd39d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7e2b-91ac-d6a4390cd39d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019e4258-c669-7c22-9a8f-08ea1d3588ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019e4258-c669-7c22-9a8f-08ea1d3588ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7cdb-89ae-a6e4170881b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7cdb-89ae-a6e4170881b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e4258-c669-7a6a-9a37-45cda7a04592" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e4258-c669-7a6a-9a37-45cda7a04592" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofEffectsofDerivativeInstrumentsontheCondensedConsolidatedStatementsofIncomeandChangesinAOCIDetails_1" xlink:type="simple" xlink:href="ugi-20260630.xsd#DerivativeInstrumentsandHedgingActivitiesScheduleofEffectsofDerivativeInstrumentsontheCondensedConsolidatedStatementsofIncomeandChangesinAOCIDetails_1"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/DerivativeInstrumentsandHedgingActivitiesScheduleofEffectsofDerivativeInstrumentsontheCondensedConsolidatedStatementsofIncomeandChangesinAOCIDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" 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_019e4258-c669-7d91-aebf-04f46e11506c" 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_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4258-c669-7d91-aebf-04f46e11506c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c669-7ad4-ab06-fd9778a5b965" 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_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019e4258-c669-7ad4-ab06-fd9778a5b965" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-7ad4-ab06-fd9778a5b965_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_019e4258-c669-7ad4-ab06-fd9778a5b965" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-7ad4-ab06-fd9778a5b965_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" 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_019e4258-c669-7ad4-ab06-fd9778a5b965" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_019e4258-c669-756e-b60c-aef7513845f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:to="loc_us-gaap_InterestRateContractMember_019e4258-c669-756e-b60c-aef7513845f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_019e4258-c669-7a15-8b14-24c834a99d77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:to="loc_us-gaap_CommodityContractMember_019e4258-c669-7a15-8b14-24c834a99d77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_019e4258-c669-722b-87f6-3c5fec46f485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019e4258-c669-760f-99f5-cad88287ec27" xlink:to="loc_us-gaap_ForeignExchangeContractMember_019e4258-c669-722b-87f6-3c5fec46f485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019e4258-c669-7920-9a1d-735100d9a1c7" 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_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_HedgingDesignationAxis_019e4258-c669-7920-9a1d-735100d9a1c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-7920-9a1d-735100d9a1c7_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_019e4258-c669-7920-9a1d-735100d9a1c7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-7920-9a1d-735100d9a1c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-72e2-bbda-150bcb20d035" 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_019e4258-c669-7920-9a1d-735100d9a1c7" xlink:to="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-72e2-bbda-150bcb20d035" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4258-c669-7201-aeca-5b99a5f56ff2" 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_019e4258-c669-72e2-bbda-150bcb20d035" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019e4258-c669-7201-aeca-5b99a5f56ff2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019e4258-c669-782b-80c6-7c337a35ce34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019e4258-c669-72e2-bbda-150bcb20d035" xlink:to="loc_us-gaap_NondesignatedMember_019e4258-c669-782b-80c6-7c337a35ce34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019e4258-c669-7d91-aebf-04f46e11506c" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-73a1-b006-65ef014b34bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-73a1-b006-65ef014b34bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019e4258-c669-73a1-b006-65ef014b34bf" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_019e4258-c669-7ce1-a866-2a8c1b80d61d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:to="loc_us-gaap_CashFlowHedgingMember_019e4258-c669-7ce1-a866-2a8c1b80d61d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_019e4258-c669-791c-b590-d54584738c80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019e4258-c669-7434-9b1b-0e5dda4cdc1d" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_019e4258-c669-791c-b590-d54584738c80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7e2b-91ac-d6a4390cd39d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7e2b-91ac-d6a4390cd39d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019e4258-c669-7c22-9a8f-08ea1d3588ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_019e4258-c669-7c22-9a8f-08ea1d3588ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7cdb-89ae-a6e4170881b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetInvestmentHedgeGainLossBeforeReclassificationAndTax_019e4258-c669-7cdb-89ae-a6e4170881b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e4258-c669-7a6a-9a37-45cda7a04592" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019e4258-c669-742c-908f-66a69a078498" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_019e4258-c669-7a6a-9a37-45cda7a04592" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#AccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/AccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019e4258-c669-7b98-ae2a-fd2d9ab34a49" 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_019e4258-c669-7095-98e5-66dd856ad005" 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_019e4258-c669-7b98-ae2a-fd2d9ab34a49" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019e4258-c669-7095-98e5-66dd856ad005" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019e4258-c669-737c-bd75-e92bf7fe8de8" 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_019e4258-c669-7095-98e5-66dd856ad005" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019e4258-c669-737c-bd75-e92bf7fe8de8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4258-c669-737c-bd75-e92bf7fe8de8_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_019e4258-c669-737c-bd75-e92bf7fe8de8" xlink:to="loc_us-gaap_EquityComponentDomain_019e4258-c669-737c-bd75-e92bf7fe8de8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019e4258-c669-7c67-a5fe-98053db6a894" 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_019e4258-c669-737c-bd75-e92bf7fe8de8" xlink:to="loc_us-gaap_EquityComponentDomain_019e4258-c669-7c67-a5fe-98053db6a894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4258-c669-789b-a500-65d14bca9fd5" 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_019e4258-c669-7c67-a5fe-98053db6a894" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4258-c669-789b-a500-65d14bca9fd5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e4258-c669-7abc-97d2-aeb4c2c7d087" 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_019e4258-c669-789b-a500-65d14bca9fd5" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_019e4258-c669-7abc-97d2-aeb4c2c7d087" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019e4258-c669-78b0-a607-c0e592247a97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4258-c669-789b-a500-65d14bca9fd5" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019e4258-c669-78b0-a607-c0e592247a97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e4258-c669-7ac5-8046-7dc588ec649a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019e4258-c669-789b-a500-65d14bca9fd5" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019e4258-c669-7ac5-8046-7dc588ec649a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4258-c669-7520-a84e-af2d6e55ebfb" 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_019e4258-c669-7b98-ae2a-fd2d9ab34a49" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4258-c669-7520-a84e-af2d6e55ebfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4258-c669-74fd-a481-44347d5397b1" 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_019e4258-c669-7520-a84e-af2d6e55ebfb" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4258-c669-74fd-a481-44347d5397b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e4258-c669-7c81-a52e-fedb66faed05" 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_019e4258-c669-7520-a84e-af2d6e55ebfb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_019e4258-c669-7c81-a52e-fedb66faed05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019e4258-c669-7798-b62c-2b1fea091c45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019e4258-c669-7520-a84e-af2d6e55ebfb" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019e4258-c669-7798-b62c-2b1fea091c45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e4258-c669-7f88-84c8-0f4ebd0f8e64" 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_019e4258-c669-7520-a84e-af2d6e55ebfb" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019e4258-c669-7f88-84c8-0f4ebd0f8e64" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019e4258-c669-7282-b7f7-781605b5693c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/SegmentInformationScheduleofSegmentReportingInformationDetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#SegmentInformationScheduleofSegmentReportingInformationDetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/SegmentInformationScheduleofSegmentReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" 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_019e4258-c669-7536-83d4-0a1f05cd7ddb" 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_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4258-c669-7536-83d4-0a1f05cd7ddb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e4258-c669-79b7-ba6c-e1d4a78f72cc" 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_ScheduleOfSegmentReportingInformationBySegmentTable_019e4258-c669-7536-83d4-0a1f05cd7ddb" xlink:to="loc_srt_ConsolidationItemsAxis_019e4258-c669-79b7-ba6c-e1d4a78f72cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4258-c669-79b7-ba6c-e1d4a78f72cc_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_019e4258-c669-79b7-ba6c-e1d4a78f72cc" xlink:to="loc_srt_ConsolidationItemsDomain_019e4258-c669-79b7-ba6c-e1d4a78f72cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e4258-c669-7cb6-8ea5-68c7744739f4" 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_019e4258-c669-79b7-ba6c-e1d4a78f72cc" xlink:to="loc_srt_ConsolidationItemsDomain_019e4258-c669-7cb6-8ea5-68c7744739f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019e4258-c669-7e37-a0ef-130b2b07330d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4258-c669-7cb6-8ea5-68c7744739f4" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019e4258-c669-7e37-a0ef-130b2b07330d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019e4258-c669-770b-975e-b83c32522bca" 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_019e4258-c669-7cb6-8ea5-68c7744739f4" xlink:to="loc_us-gaap_OperatingSegmentsMember_019e4258-c669-770b-975e-b83c32522bca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_CorporateAndReconcilingItemsMember_019e4258-c669-7077-af9a-abdea883728c" xlink:href="ugi-20260630.xsd#ugi_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4258-c669-7cb6-8ea5-68c7744739f4" xlink:to="loc_ugi_CorporateAndReconcilingItemsMember_019e4258-c669-7077-af9a-abdea883728c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_CorporateReconcilingItemsAndEliminationsMember_019e4258-c669-7bb3-ba0c-8fa44feb4e8d" xlink:href="ugi-20260630.xsd#ugi_CorporateReconcilingItemsAndEliminationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e4258-c669-7cb6-8ea5-68c7744739f4" xlink:to="loc_ugi_CorporateReconcilingItemsAndEliminationsMember_019e4258-c669-7bb3-ba0c-8fa44feb4e8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c669-7b52-a021-72a5f0bda091" 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_019e4258-c669-7536-83d4-0a1f05cd7ddb" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c669-7b52-a021-72a5f0bda091" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c669-7b52-a021-72a5f0bda091_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_019e4258-c669-7b52-a021-72a5f0bda091" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c669-7b52-a021-72a5f0bda091_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c669-7244-920c-6a1c7dbba0c3" 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_019e4258-c669-7b52-a021-72a5f0bda091" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c669-7244-920c-6a1c7dbba0c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIUtilitiesIncMember_019e4258-c669-7d7a-90b9-296857aba12b" xlink:href="ugi-20260630.xsd#ugi_UGIUtilitiesIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7244-920c-6a1c7dbba0c3" xlink:to="loc_ugi_UGIUtilitiesIncMember_019e4258-c669-7d7a-90b9-296857aba12b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MidstreamAndMarketingMember_019e4258-c669-767c-be4c-6496f2f7f6e5" xlink:href="ugi-20260630.xsd#ugi_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7244-920c-6a1c7dbba0c3" xlink:to="loc_ugi_MidstreamAndMarketingMember_019e4258-c669-767c-be4c-6496f2f7f6e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIInternationalLLCMember_019e4258-c669-7dee-ac5c-ed73d4e96a64" xlink:href="ugi-20260630.xsd#ugi_UGIInternationalLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7244-920c-6a1c7dbba0c3" xlink:to="loc_ugi_UGIInternationalLLCMember_019e4258-c669-7dee-ac5c-ed73d4e96a64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPropaneMember_019e4258-c669-71bc-ab0f-f2e901419d9f" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPropaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7244-920c-6a1c7dbba0c3" xlink:to="loc_ugi_AmeriGasPropaneMember_019e4258-c669-71bc-ab0f-f2e901419d9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_RevenuesPriorToIntersegmentEffect_019e4258-c669-71b6-90b6-058ff7b14ac5" xlink:href="ugi-20260630.xsd#ugi_RevenuesPriorToIntersegmentEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_ugi_RevenuesPriorToIntersegmentEffect_019e4258-c669-71b6-90b6-058ff7b14ac5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019e4258-c669-74e6-8b3b-7cd4b4b3327c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_Revenues_019e4258-c669-74e6-8b3b-7cd4b4b3327c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_019e4258-c669-7c80-a8e2-c3faaac92c25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_019e4258-c669-7c80-a8e2-c3faaac92c25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e4258-c669-7708-bdc0-d328c83c887a" 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_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e4258-c669-7708-bdc0-d328c83c887a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019e4258-c669-76c7-95d3-377f251027ad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019e4258-c669-76c7-95d3-377f251027ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019e4258-c669-74b8-bd19-f2b9714542e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_019e4258-c669-74b8-bd19-f2b9714542e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019e4258-c669-7485-94bd-415aaaeee7d5" 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_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019e4258-c669-7485-94bd-415aaaeee7d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeInterestExpenseInterestIncomeIncomeTaxesExtraordinaryItemsNoncontrollingInterestsNet_019e4258-c669-7f50-ba78-124471512599" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeInterestExpenseInterestIncomeIncomeTaxesExtraordinaryItemsNoncontrollingInterestsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeInterestExpenseInterestIncomeIncomeTaxesExtraordinaryItemsNoncontrollingInterestsNet_019e4258-c669-7f50-ba78-124471512599" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019e4258-c669-7d5c-a844-c8cc077227d2" 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_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019e4258-c669-7d5c-a844-c8cc077227d2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e4258-c669-72d6-867f-c5a9f88532e5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e4258-c669-72d6-867f-c5a9f88532e5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_019e4258-c669-7129-9712-568b5231c7e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_019e4258-c669-7129-9712-568b5231c7e2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e4258-c669-7c82-a675-3922927ae18b" 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_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_SegmentExpenditureAdditionToLongLivedAssets_019e4258-c669-7c82-a675-3922927ae18b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e4258-c669-7ea6-a654-a618102ff1a5" 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_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_Assets_019e4258-c669-7ea6-a654-a618102ff1a5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019e4258-c669-7b7a-8abd-14bd28f4b040" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-7099-b8c7-2d3280ae89b8" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019e4258-c669-7b7a-8abd-14bd28f4b040" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/SegmentInformationScheduleofReconciliationofPartnershipAdjustedEBITDADetails" xlink:type="simple" xlink:href="ugi-20260630.xsd#SegmentInformationScheduleofReconciliationofPartnershipAdjustedEBITDADetails"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/SegmentInformationScheduleofReconciliationofPartnershipAdjustedEBITDADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" 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_019e4258-c669-75d5-b921-26a9cf327c41" 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_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4258-c669-75d5-b921-26a9cf327c41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c669-758e-a1db-2fa417d7d72a" 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_019e4258-c669-75d5-b921-26a9cf327c41" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c669-758e-a1db-2fa417d7d72a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c669-758e-a1db-2fa417d7d72a_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_019e4258-c669-758e-a1db-2fa417d7d72a" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c669-758e-a1db-2fa417d7d72a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" 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_019e4258-c669-758e-a1db-2fa417d7d72a" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MidstreamAndMarketingMember_019e4258-c669-7deb-a667-394eec50773f" xlink:href="ugi-20260630.xsd#ugi_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:to="loc_ugi_MidstreamAndMarketingMember_019e4258-c669-7deb-a667-394eec50773f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIInternationalLLCMember_019e4258-c669-780a-9f07-acd7b7e787c2" xlink:href="ugi-20260630.xsd#ugi_UGIInternationalLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:to="loc_ugi_UGIInternationalLLCMember_019e4258-c669-780a-9f07-acd7b7e787c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPropaneMember_019e4258-c669-7cf5-a951-c3f81cfe0fab" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPropaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:to="loc_ugi_AmeriGasPropaneMember_019e4258-c669-7cf5-a951-c3f81cfe0fab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fab7a-3760-74a8-9b69-e69f66a48d0c" 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_ScheduleOfSegmentReportingInformationBySegmentTable_019e4258-c669-75d5-b921-26a9cf327c41" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_019fab7a-3760-74a8-9b69-e69f66a48d0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_019e4258-c669-7525-8039-8c9c899a9af6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_019e4258-c669-7525-8039-8c9c899a9af6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e88a5-3c75-79b6-82a0-8fbbea657a56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e88a5-3c75-79b6-82a0-8fbbea657a56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_019e4258-c669-783c-8e7c-32f382ece90a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_019e4258-c669-783c-8e7c-32f382ece90a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_019f84f7-9c35-7458-b46e-cdd00951287b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_RestructuringCosts_019f84f7-9c35-7458-b46e-cdd00951287b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeDebtSecuritiesOperating_019e4258-c669-7f45-ad17-f89527c4a68c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeDebtSecuritiesOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_InterestIncomeDebtSecuritiesOperating_019e4258-c669-7f45-ad17-f89527c4a68c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.ugicorp.com/role/SegmentInformationScheduleofReconciliationofPartnershipAdjustedEBITDADetails_1" xlink:type="simple" xlink:href="ugi-20260630.xsd#SegmentInformationScheduleofReconciliationofPartnershipAdjustedEBITDADetails_1"/>
  <link:definitionLink xlink:role="http://www.ugicorp.com/role/SegmentInformationScheduleofReconciliationofPartnershipAdjustedEBITDADetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" 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_019e4258-c669-75d5-b921-26a9cf327c41" 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_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019e4258-c669-75d5-b921-26a9cf327c41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c669-758e-a1db-2fa417d7d72a" 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_019e4258-c669-75d5-b921-26a9cf327c41" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019e4258-c669-758e-a1db-2fa417d7d72a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c669-758e-a1db-2fa417d7d72a_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_019e4258-c669-758e-a1db-2fa417d7d72a" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c669-758e-a1db-2fa417d7d72a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" 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_019e4258-c669-758e-a1db-2fa417d7d72a" xlink:to="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_MidstreamAndMarketingMember_019e4258-c669-7deb-a667-394eec50773f" xlink:href="ugi-20260630.xsd#ugi_MidstreamAndMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:to="loc_ugi_MidstreamAndMarketingMember_019e4258-c669-7deb-a667-394eec50773f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_UGIInternationalLLCMember_019e4258-c669-780a-9f07-acd7b7e787c2" xlink:href="ugi-20260630.xsd#ugi_UGIInternationalLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:to="loc_ugi_UGIInternationalLLCMember_019e4258-c669-780a-9f07-acd7b7e787c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ugi_AmeriGasPropaneMember_019e4258-c669-7cf5-a951-c3f81cfe0fab" xlink:href="ugi-20260630.xsd#ugi_AmeriGasPropaneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019e4258-c669-7fb4-94e8-259615f3d782" xlink:to="loc_ugi_AmeriGasPropaneMember_019e4258-c669-7cf5-a951-c3f81cfe0fab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_019e4258-c669-7525-8039-8c9c899a9af6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_019e4258-c669-7525-8039-8c9c899a9af6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e88a5-3c75-79b6-82a0-8fbbea657a56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e88a5-3c75-79b6-82a0-8fbbea657a56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_019e4258-c669-783c-8e7c-32f382ece90a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_019e4258-c669-783c-8e7c-32f382ece90a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCosts_019f84f7-9c35-7458-b46e-cdd00951287b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_RestructuringCosts_019f84f7-9c35-7458-b46e-cdd00951287b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeDebtSecuritiesOperating_019e4258-c669-7f45-ad17-f89527c4a68c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeDebtSecuritiesOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019e4258-c669-75fc-9590-d56d7b17c0f0" xlink:to="loc_us-gaap_InterestIncomeDebtSecuritiesOperating_019e4258-c669-7f45-ad17-f89527c4a68c" xlink:type="arc" order="4"/>
  </link:definitionLink>
</link:linkbase>
