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  <xsd:element abstract="true" id="sigi_DisclosureofRetiredPlansAbstract" name="DisclosureofRetiredPlansAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_DisclosureofShareBasedCompensationExpensesAbstract" name="DisclosureofShareBasedCompensationExpensesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_DividendEquivalentUnitsMember" name="DividendEquivalentUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_DividendPaidToParentTableTextBlock" name="DividendPaidToParentTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_DividendRestrictionNewYork" name="DividendRestrictionNewYork" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_DividendsPaidToParentAxis" name="DividendsPaidToParentAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_DividendsPaidToParentDomain" name="DividendsPaidToParentDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_DividendsPaidToParentTable" name="DividendsPaidToParentTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ESLinesMember" name="ESLinesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_EnvironmentalclaimsMember" name="EnvironmentalclaimsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_EquityInUndistributedIncomeOfContinuingSubsidiariesNetOfTax" name="EquityInUndistributedIncomeOfContinuingSubsidiariesNetOfTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_EquityMethodInvestmentsSummarizedFinancialInformationInvestments" name="EquityMethodInvestmentsSummarizedFinancialInformationInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="sigi_EquityOwnershipPercentageOfDirectorOfParent" name="EquityOwnershipPercentageOfDirectorOfParent" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_ExcessAndSurplusOperationsMember" name="ExcessAndSurplusOperationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ExtendedDurationFixedIncomeMember" name="ExtendedDurationFixedIncomeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_FairValueAssetsLiabilitiesDisclosedTable" name="FairValueAssetsLiabilitiesDisclosedTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_FairValueAssetsLiabilitiesDisclosedTableTextBlock" name="FairValueAssetsLiabilitiesDisclosedTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMultipleAmount" name="FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMultipleAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_FivePointEightHundredSeventyFiveMember" name="FivePointEightHundredSeventyFiveMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_FloodCededPremiumsAndLossesAxis" name="FloodCededPremiumsAndLossesAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_FloodCededPremiumsAndLossesDomain" name="FloodCededPremiumsAndLossesDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_FloodCededPremiumsAndLossesTable" name="FloodCededPremiumsAndLossesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_FundedStatusOfRetirementIncomePlanAxis" name="FundedStatusOfRetirementIncomePlanAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_FundedStatusOfRetirementIncomePlanDomain" name="FundedStatusOfRetirementIncomePlanDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_GeographicConcentrationOfNetPremiumsWrittenPercentage" name="GeographicConcentrationOfNetPremiumsWrittenPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_GlobalAssetAllocationFundMember" name="GlobalAssetAllocationFundMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_GlobalEquityMember" name="GlobalEquityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_HanoverRuckversicherungsAgMember" name="HanoverRuckversicherungsAgMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_HeldToMaturitySecuritiesDisposedSecurityRealizedLoss" name="HeldToMaturitySecuritiesDisposedSecurityRealizedLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_HeldToMaturitySecuritiesNetUnrealizedGainsLosses" name="HeldToMaturitySecuritiesNetUnrealizedGainsLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="sigi_HeldToMaturitySecuritiesRealizedGain" name="HeldToMaturitySecuritiesRealizedGain" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_HomeownersMember" name="HomeownersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_IncomeLossFromContinuingOperationsBeforeFederalIncomeTax" name="IncomeLossFromContinuingOperationsBeforeFederalIncomeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_IncomeTaxReconciliationTaxAdvantagedInterestIncome" name="IncomeTaxReconciliationTaxAdvantagedInterestIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_IncreaseDecreaseInAccruedLongTermStockCompensation" name="IncreaseDecreaseInAccruedLongTermStockCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables" name="IncreaseDecreaseInReservesForLossesAndLossExpensesNetOfReinsuranceRecoverables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance" name="IncreaseDecreaseInUnearnedPremiumsNetOfPrepaidReinsurance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_IndebtednessAbstract" name="IndebtednessAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_InsuranceSubsidiariesStatutorySurplusDataTableTextBlock" name="InsuranceSubsidiariesStatutorySurplusDataTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_IntercompanyNotesPayable" name="IntercompanyNotesPayable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_InternationalSecuritiesMember" name="InternationalSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_InvestmentExpensesMember" name="InvestmentExpensesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_InvestmentInSubsidiaries" name="InvestmentInSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="sigi_InvestmentYieldsAssumedInPremiumDeficiencyAssessment" name="InvestmentYieldsAssumedInPremiumDeficiencyAssessment" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_InvestmentsAccountedForUnderTheEquityMethodMember" name="InvestmentsAccountedForUnderTheEquityMethodMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_InvestmentsPledgedAsCollateralTable" name="InvestmentsPledgedAsCollateralTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_LandfillSitesRelatedClaimsMember" name="LandfillSitesRelatedClaimsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_LeakingUndergroundStorageTanksMember" name="LeakingUndergroundStorageTanksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_LiabilityHedgingAssetsMember" name="LiabilityHedgingAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_LineOfBusinessBySegmentAxis" name="LineOfBusinessBySegmentAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_LineOfBusinessBySegmentDomain" name="LineOfBusinessBySegmentDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_LineOfCreditConsolidatedNetWorthRequirement" name="LineOfCreditConsolidatedNetWorthRequirement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_LineOfCreditDebtToCapitalizationRatioRequirement" name="LineOfCreditDebtToCapitalizationRatioRequirement" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_LineOfCreditStatutorySurplusRequirement" name="LineOfCreditStatutorySurplusRequirement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_LongTermDebtExcludingDebtDiscountAndDebtIssuanceCosts" name="LongTermDebtExcludingDebtDiscountAndDebtIssuanceCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_LongTermDebtExcludingIssuanceCostsMember" name="LongTermDebtExcludingIssuanceCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_MaximumBorrowingPercentage" name="MaximumBorrowingPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_MaximumPaymentsOfOrdinaryDividendsTextBlock" name="MaximumPaymentsOfOrdinaryDividendsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_MaximumPercentageOfAnyCorporationOutstandingSharesThatIsAllowedForRetirementIncomePlan" name="MaximumPercentageOfAnyCorporationOutstandingSharesThatIsAllowedForRetirementIncomePlan" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_MaximumPercentageOfAnySecurityValueOfTotalPlansPortfolioVaueThatIsAllowed" name="MaximumPercentageOfAnySecurityValueOfTotalPlansPortfolioVaueThatIsAllowed" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies" name="MaximumexposuretocreditconcentrationriskoftheCompanysstockholdersequityotherthancertainU.S.governmentagencies" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_MesaUnderwritingSpecialtyInsuranceCompanyMember" name="MesaUnderwritingSpecialtyInsuranceCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_MiscellaneousIncomeMember" name="MiscellaneousIncomeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_MunichReGroupMember" name="MunichReGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_NationalFloodInsuranceProgramMember" name="NationalFloodInsuranceProgramMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_NetChangeInUnrealizedAppreciationDepreciationOfEquityMethodInvestees" name="NetChangeInUnrealizedAppreciationDepreciationOfEquityMethodInvestees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_NetIncomeLossFromContinuingOperationsBeforeEquityInUndistributedIncomeOfSubsidiaries" name="NetIncomeLossFromContinuingOperationsBeforeEquityInUndistributedIncomeOfSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_NetInvestmentIncomeOfEquityMethodInvestees" name="NetInvestmentIncomeOfEquityMethodInvestees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_Netunrealizedgainlossesoninvestmentsecuritiesinothercomprehensiveincomenetofdeferredincometax" name="Netunrealizedgainlossesoninvestmentsecuritiesinothercomprehensiveincomenetofdeferredincometax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_NewJerseyDividendRestriction" name="NewJerseyDividendRestriction" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_NewYorkDividendRestriction" name="NewYorkDividendRestriction" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_NjUnsatisfiedClaimJudgmentFundMember" name="NjUnsatisfiedClaimJudgmentFundMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_NonCatastrophePropertyLosses" name="NonCatastrophePropertyLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeGross" name="NonCreditPortionOfOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_NonCreditPortionofOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeTax" name="NonCreditPortionofOtherThanTemporaryImpairmentLossesRecognizedInOtherComprehensiveIncomeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncome" name="NonCreditPortionofOtherThanTemporaryImpairmentsRecognizedinOtherComprehensiveIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_Omnibus2005StockPlanMember" name="Omnibus2005StockPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OmnibusStockPlan2014Member" name="OmnibusStockPlan2014Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OnePointFiftySixPercentBorrowingFromFederalHomeLoanBankDueAugust162021Member" name="OnePointFiftySixPercentBorrowingFromFederalHomeLoanBankDueAugust162021Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OnePointSixtyOnePercentBorrowingFromFederalHomeLoanBankDueJuly212021Member" name="OnePointSixtyOnePercentBorrowingFromFederalHomeLoanBankDueJuly212021Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OnePointTwoNinePercentBorrowingFromFederalHomeLoanBankDueNovember152017Member" name="OnePointTwoNinePercentBorrowingFromFederalHomeLoanBankDueNovember152017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_OrdinaryDividendsPaidToParent" name="OrdinaryDividendsPaidToParent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OrganizationAbstract" name="OrganizationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OtherCommercialMember" name="OtherCommercialMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesBeforeTax" name="OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesBeforeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesNetOfTax" name="OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesNetOfTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesTax" name="OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForNonCreditOtherThanTemporaryImpairedSecuritiesTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OtherFederalAndStatePoolsMember" name="OtherFederalAndStatePoolsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_OtherInvestmentsRealizedGains" name="OtherInvestmentsRealizedGains" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_OtherInvestmentsRealizedLosses" name="OtherInvestmentsRealizedLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OtherPersonalMember" name="OtherPersonalMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OtherPrivateAssetsMember" name="OtherPrivateAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_OtherSecuritiesMember" name="OtherSecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_PartnerReinsuranceCompanyOfUsMember" name="PartnerReinsuranceCompanyOfUsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_PercentageCommonStockOwnedbyRelatedParty" name="PercentageCommonStockOwnedbyRelatedParty" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_PercentageDeclineInFairValuePercentage" name="PercentageDeclineInFairValuePercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_PercentageOfNetUnsecuredReinsurance" name="PercentageOfNetUnsecuredReinsurance" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_PercentageOfUnpaidNfipClaimsCededByFederalGovernment" name="PercentageOfUnpaidNfipClaimsCededByFederalGovernment" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_PersonalAutomobileMember" name="PersonalAutomobileMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_PrincipalAccelerationAmountStateofDefault" name="PrincipalAccelerationAmountStateofDefault" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_PrincipalPaymentsOfBorrowingsFromSubsidiaries" name="PrincipalPaymentsOfBorrowingsFromSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_PrivateCreditFundsMember" name="PrivateCreditFundsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ProvisionalIncreasetoDeferredTaxAsset" name="ProvisionalIncreasetoDeferredTaxAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_PurchaseAmountOfAnnuities" name="PurchaseAmountOfAnnuities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_RealAssetsMember" name="RealAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_RealizedGainLossOnInvestmentsTable" name="RealizedGainLossOnInvestmentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_RealizedGainsLossesOfEquityMethodInvestees" name="RealizedGainsLossesOfEquityMethodInvestees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_RedemptionOfSevenPointFiftyPercentJuniorNotesMember" name="RedemptionOfSevenPointFiftyPercentJuniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_RelatedPartyInsuranceAgencyMember" name="RelatedPartyInsuranceAgencyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_RelatedPartyTransactionsContributionsToFoundation" name="RelatedPartyTransactionsContributionsToFoundation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
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  <xsd:element id="sigi_RemainingReinsuranceBalances" name="RemainingReinsuranceBalances" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_RemainingUnsecuredReinsuranceMember" name="RemainingUnsecuredReinsuranceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_RemainingUnsecuredReinsuranceNetofCollateralMember" name="RemainingUnsecuredReinsuranceNetofCollateralMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ReturnSeekingAssetsMember" name="ReturnSeekingAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfAggregatedSummarizedBalanceSheetFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock" name="ScheduleOfAggregatedSummarizedBalanceSheetFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfAggregatedSummarizedIncomeStatementFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock" name="ScheduleOfAggregatedSummarizedIncomeStatementFinancialInformationForPartnerhipsInOurAlternativeInvestmentPortfolioTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfCashFlowSupplumentalDisclosuresAxis" name="ScheduleOfCashFlowSupplumentalDisclosuresAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfCashFlowSupplumentalDisclosuresDomain" name="ScheduleOfCashFlowSupplumentalDisclosuresDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfExposureToEnvironmentalClaimsTableTextBlock" name="ScheduleOfExposureToEnvironmentalClaimsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfFairValueAndGrossPreTaxUnrealizedUnrecognizedLossOfSecuritiesByLengthOfTimeAxis" name="ScheduleOfFairValueAndGrossPreTaxUnrealizedUnrecognizedLossOfSecuritiesByLengthOfTimeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
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  <xsd:element id="sigi_ScheduleOfFloodCededPremiumsAndLossesTableTextBlock" name="ScheduleOfFloodCededPremiumsAndLossesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfLiabilityForUnpaidEnvironmentalClaimsAndClaimsAdjustmentExpenseAxis" name="ScheduleOfLiabilityForUnpaidEnvironmentalClaimsAndClaimsAdjustmentExpenseAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfLiabilityForUnpaidEnvironmentalClaimsAndClaimsAdjustmentExpenseDomain" name="ScheduleOfLiabilityForUnpaidEnvironmentalClaimsAndClaimsAdjustmentExpenseDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfLiabilityForUnpaidEnvironmentalClaimsAndClaimsAdjustmentExpenseTableTextBlock" name="ScheduleOfLiabilityForUnpaidEnvironmentalClaimsAndClaimsAdjustmentExpenseTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfNumberOfSecuritiesInUnrealizedUnrecognizedLossPositionTable" name="ScheduleOfNumberOfSecuritiesInUnrealizedUnrecognizedLossPositionTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfOTTIByAssetTypeTableTextBlock" name="ScheduleOfOTTIByAssetTypeTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfOtherInvestmentPortfolioByStrategyAndRemainingCommitmentAmountAssociatedWithEachStrategyTextblock" name="ScheduleOfOtherInvestmentPortfolioByStrategyAndRemainingCommitmentAmountAssociatedWithEachStrategyTextblock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfOttiByAssetTypeAxis" name="ScheduleOfOttiByAssetTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleOfOttiByAssetTypeDomain" name="ScheduleOfOttiByAssetTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element id="sigi_ScheduleOfPlanTermsInEffectAndRevisionsOfRetirementSavingsPlanTableTextBlock" name="ScheduleOfPlanTermsInEffectAndRevisionsOfRetirementSavingsPlanTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleOfShareBasedCompensationPlanApprovalTableTextBlock" name="ScheduleOfShareBasedCompensationPlanApprovalTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleofAvailableForSaleandHeldToMaturityLineItems" name="ScheduleofAvailableForSaleandHeldToMaturityLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleofDebtInstrumentsLineItems" name="ScheduleofDebtInstrumentsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
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  <xsd:element id="sigi_ScheduleofFutureMinimumRentalCommitmentsForNonCancelableLeasesTableTextBlock" name="ScheduleofFutureMinimumRentalCommitmentsForNonCancelableLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleofShareBasedCompensationESPPandASPPSharesGrantedLineItems" name="ScheduleofShareBasedCompensationESPPandASPPSharesGrantedLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleofShareBasedCompensationESPPandASPPSharesGrantedTable" name="ScheduleofShareBasedCompensationESPPandASPPSharesGrantedTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ScheduleofShareBasedCompensationESPPandASPPSharesIssuedTableTextBlock" name="ScheduleofShareBasedCompensationESPPandASPPSharesIssuedTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ScheduleofShareBasedCompensationRetiredPlansLineItems" name="ScheduleofShareBasedCompensationRetiredPlansLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
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  <xsd:element id="sigi_ScheduleofShareBasedCompensationSharesAuthorizedAvailableforIssuanceandOutstandingTableTextBlock" name="ScheduleofShareBasedCompensationSharesAuthorizedAvailableforIssuanceandOutstandingTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
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  <xsd:element id="sigi_ScheduleofTypesofShareBasedPaymentsIssuedTableTextBlock" name="ScheduleofTypesofShareBasedPaymentsIssuedTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveAutoInsuranceCompanyOfNewJerseyMember" name="SelectiveAutoInsuranceCompanyOfNewJerseyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveCasualtyInsuranceCompanyMember" name="SelectiveCasualtyInsuranceCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveFireAndCasualtyInsuranceCompanyMember" name="SelectiveFireAndCasualtyInsuranceCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveInsuranceCompanyOfAmericaMember" name="SelectiveInsuranceCompanyOfAmericaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveInsuranceCompanyOfNewEnglandMember" name="SelectiveInsuranceCompanyOfNewEnglandMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveInsuranceCompanyOfNewYorkMember" name="SelectiveInsuranceCompanyOfNewYorkMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveInsuranceCompanyOfSouthCarolinaMember" name="SelectiveInsuranceCompanyOfSouthCarolinaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveInsuranceCompanyOfSoutheastMember" name="SelectiveInsuranceCompanyOfSoutheastMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SelectiveWayInsuranceCompanyMember" name="SelectiveWayInsuranceCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SevenPointTwentyFivePercentSeniorNotesMember" name="SevenPointTwentyFivePercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsEmployeeStockPurchasePlanGrantsInPeriodWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsEmployeeStockPurchasePlanGrantsInPeriodWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsEmployeeStockPurchasePlanGrantsInPeriodWeightedAverageGrantDateFairValueTotal" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsEmployeeStockPurchasePlanGrantsInPeriodWeightedAverageGrantDateFairValueTotal" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ShareBasedCompensationLiabilityAwardsAmountOfLiability" name="ShareBasedCompensationLiabilityAwardsAmountOfLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_ShareBasedPaymentSharesAvailableforIssuanceAbstract" name="ShareBasedPaymentSharesAvailableforIssuanceAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ShortDurationInsuranceContractsAccidentYearsPriorto2008Member" name="ShortDurationInsuranceContractsAccidentYearsPriorto2008Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_ShortTermInvestmentsRealizedGains" name="ShortTermInvestmentsRealizedGains" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_ShortTermInvestmentsRealizedLosses" name="ShortTermInvestmentsRealizedLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SixPointSeventyPercentSeniorNotesMember" name="SixPointSeventyPercentSeniorNotesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_StandardCommercialLinesMember" name="StandardCommercialLinesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_StatutoryAccountingPracticesStatutoryUnassignedSurplus" name="StatutoryAccountingPracticesStatutoryUnassignedSurplus" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_StatutoryDataAxis" name="StatutoryDataAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_StatutoryDataDomain" name="StatutoryDataDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_StatutoryDataTable" name="StatutoryDataTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_StatutoryFinancialInformationDisclosureTextBlock" name="StatutoryFinancialInformationDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_StockCompensationPlanForNonEmployeeDirectorsMember" name="StockCompensationPlanForNonEmployeeDirectorsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_StockOptionShareBasedCompensationMember" name="StockOptionShareBasedCompensationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_SwissReGroupMember" name="SwissReGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_TaxBenefitonUnrealizedGains" name="TaxBenefitonUnrealizedGains" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TaxBenefitsRelatedToCompensationExpenseDeductionsForShareBasedCompensationAwards" name="TaxBenefitsRelatedToCompensationExpenseDeductionsForShareBasedCompensationAwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TaxReformDeferredTaxAssetImpact" name="TaxReformDeferredTaxAssetImpact" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_Taxoninvestmentincome" name="Taxoninvestmentincome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TerrorismRiskInsuranceProgramAnnualCap" name="TerrorismRiskInsuranceProgramAnnualCap" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TerrorismRiskInsuranceProgramCompanysEstimatedDeductible" name="TerrorismRiskInsuranceProgramCompanysEstimatedDeductible" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TerrorismRiskInsuranceProgramFederalShareReduction" name="TerrorismRiskInsuranceProgramFederalShareReduction" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_TerrorismRiskInsuranceProgramInsurerRetainer" name="TerrorismRiskInsuranceProgramInsurerRetainer" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="sigi_TerrorismRiskInsuranceProgramReimbursedPercentageMaximum" name="TerrorismRiskInsuranceProgramReimbursedPercentageMaximum" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_TerrorismRiskInsuranceProgramReimbursedPercentageMinimum" name="TerrorismRiskInsuranceProgramReimbursedPercentageMinimum" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_ThreePointZeroThreePercentBorrowingFromFederalHomeLoanBankDueDecember162026Member" name="ThreePointZeroThreePercentBorrowingFromFederalHomeLoanBankDueDecember162026Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_TotalCommercialLinesMember" name="TotalCommercialLinesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_TotalESLinesMember" name="TotalESLinesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_TotalFederalAndStatePoolsMember" name="TotalFederalAndStatePoolsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalInvestmentIncomeAfterFederalIncomeTax" name="TotalInvestmentIncomeAfterFederalIncomeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalInvestmentRevenues" name="TotalInvestmentRevenues" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalLeasesDueCurrentYear" name="TotalLeasesDueCurrentYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TotalLeasesDueInFiveYears" name="TotalLeasesDueInFiveYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TotalLeasesDueInFourYears" name="TotalLeasesDueInFourYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TotalLeasesDueInThreeYears" name="TotalLeasesDueInThreeYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TotalLeasesDueInTwoYears" name="TotalLeasesDueInTwoYears" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TotalLeasesDueThereafter" name="TotalLeasesDueThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_TotalMinimumPaymentRequired" name="TotalMinimumPaymentRequired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_TotalPrivateAssetsMember" name="TotalPrivateAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalPropertyLossEstimate" name="TotalPropertyLossEstimate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalPropertyLosses" name="TotalPropertyLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalSegmentIncomeLossFromContinuingOperationsBeforeFederalIncomeTax" name="TotalSegmentIncomeLossFromContinuingOperationsBeforeFederalIncomeTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross" name="TotalUnrealizedGainsLossesOnInvestmentSecuritiesGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax" name="TotalUnrealizedGainsLossesOnInvestmentSecuritiesTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sigi_TotalUnrealizedGainsLossesonInvestmentSecurities" name="TotalUnrealizedGainsLossesonInvestmentSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_USGlobalEquityMember" name="USGlobalEquityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_UnamortizedDebtIssuanceCostsMember" name="UnamortizedDebtIssuanceCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_UnamortizedDebtIssuanceCostsRelatedtoLongTermDebt" name="UnamortizedDebtIssuanceCostsRelatedtoLongTermDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sigi_UnderwritingIncomeLossAfterFederalIncomeTaxes" name="UnderwritingIncomeLossAfterFederalIncomeTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_UnderwritingIncomeLossBeforeFederalIncomeTaxes" name="UnderwritingIncomeLossBeforeFederalIncomeTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sigi_UnrealizedGainLossOnInvestmentSecurities" name="UnrealizedGainLossOnInvestmentSecurities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_UnrealizedGainLossOnInvestmentsAxis" name="UnrealizedGainLossOnInvestmentsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_UnrealizedGainLossOnInvestmentsDomain" name="UnrealizedGainLossOnInvestmentsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_UnrealizedGainLossOnInvestmentsTable" name="UnrealizedGainLossOnInvestmentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="sigi_UnrealizedUnrecognizedLoss" name="UnrealizedUnrecognizedLoss" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="sigi_WorkersCompensationMember" name="WorkersCompensationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sigi_ZeroPointSeventyFivePercentBorrowingFromFederalHomeLoanBankDueMarch212017Member" name="ZeroPointSeventyFivePercentBorrowingFromFederalHomeLoanBankDueMarch212017Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
