<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Bowne Tagger XBRL Enabler by Bowne Software version 10.0.0.108-->
<!--Based on XBRL 2.1-->
<!--Modified on: 11/3/2010 12:38:44 PM-->
<link:linkbase xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef xlink:type="simple" xlink:href="cb-20100930.xsd#InvestedAssetsDetails" roleURI="http://chubb.com/role/InvestedAssetsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="cb-20100930.xsd#DisclosureInvestedAssetsDetails2" roleURI="http://chubb.com/role/DisclosureInvestedAssetsDetails2" />
  <link:roleRef xlink:type="simple" xlink:href="cb-20100930.xsd#DisclosureInvestedAssetsDetails4" roleURI="http://chubb.com/role/DisclosureInvestedAssetsDetails4" />
  <link:roleRef xlink:type="simple" xlink:href="cb-20100930.xsd#FairValuesOfFinancialInstrumentsDetails" roleURI="http://chubb.com/role/FairValuesOfFinancialInstrumentsDetails" />
  <link:roleRef xlink:type="simple" xlink:href="cb-20100930.xsd#SegmentsInformationDetails" roleURI="http://chubb.com/role/SegmentsInformationDetails" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
  <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/InvestedAssetsDetails" xlink:title="06041 - Disclosure - Invested Assets (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" xlink:label="cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="us-gaap_CorporateBondSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" xlink:label="cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="us-gaap_ResidentialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="us-gaap_CommercialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:label="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExemptCost" xlink:label="cb_TaxExemptCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExemptGrossUnrealizedAppreciation" xlink:label="cb_TaxExemptGrossUnrealizedAppreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExemptGrossUnrealizedDepreciation" xlink:label="cb_TaxExemptGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExempt" xlink:label="cb_TaxExempt" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxableCost" xlink:label="cb_TaxableCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxableGrossUnrealizedAppreciation" xlink:label="cb_TaxableGrossUnrealizedAppreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxableGrossUnrealizedDepreciation" xlink:label="cb_TaxableGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_Taxable" xlink:label="cb_Taxable" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesCost" xlink:label="cb_FixedMaturitiesCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesGrossUnrealizedAppreciation" xlink:label="cb_FixedMaturitiesGrossUnrealizedAppreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesGrossUnrealizedDepreciation" xlink:label="cb_FixedMaturitiesGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturities" xlink:label="cb_FixedMaturities" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_EquitySecuritiesCost" xlink:label="cb_EquitySecuritiesCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_EquitySecuritiesGrossUnrealizedAppreciation" xlink:label="cb_EquitySecuritiesGrossUnrealizedAppreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_EquitySecuritiesGrossUnrealizedDepreciation" xlink:label="cb_EquitySecuritiesGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="us-gaap_AvailableForSaleSecuritiesEquitySecurities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_CorporateBondSecuritiesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_ResidentialMortgageBackedSecuritiesMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_CommercialMortgageBackedSecuritiesMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxExemptCost" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxExemptGrossUnrealizedAppreciation" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxExemptGrossUnrealizedDepreciation" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxExempt" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxableCost" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxableGrossUnrealizedAppreciation" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_TaxableGrossUnrealizedDepreciation" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_Taxable" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_FixedMaturitiesCost" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_FixedMaturitiesGrossUnrealizedAppreciation" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_FixedMaturitiesGrossUnrealizedDepreciation" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_FixedMaturities" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_EquitySecuritiesCost" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_EquitySecuritiesGrossUnrealizedAppreciation" order="14" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="cb_EquitySecuritiesGrossUnrealizedDepreciation" order="15" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfInvestedAssetsAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesEquitySecurities" order="16" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/InvestedAssetsDetails" xlink:title="06041 - Disclosure - Invested Assets (Details 1)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DisclosureInvestedAssetsDetails2" xlink:title="06042 - Disclosure - Invested Assets (Details 2)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="us-gaap_ResidentialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="us-gaap_CommercialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:label="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValue" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValue" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxableCost" xlink:label="cb_TaxableCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_Taxable" xlink:label="cb_Taxable" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesCost" xlink:label="cb_FixedMaturitiesCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturities" xlink:label="cb_FixedMaturities" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_ResidentialMortgageBackedSecuritiesMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_CommercialMortgageBackedSecuritiesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" order="2" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValue" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="cb_TaxableCost" order="11" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="cb_Taxable" order="12" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="cb_FixedMaturitiesCost" order="13" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AmortizedCostAndFairValueOfFixedMaturitiesByContractualMaturityAbstract" xlink:to="cb_FixedMaturities" order="14" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DisclosureInvestedAssetsDetails2" xlink:title="06042 - Disclosure - Invested Assets (Details 2)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DisclosureInvestedAssetsDetails4" xlink:title="06044 - Disclosure - Invested Assets (Details 4)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" xlink:label="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" xlink:label="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesAndEquitySecuritiesInUnrealizedLossPositionMember" xlink:label="cb_FixedMaturitiesAndEquitySecuritiesInUnrealizedLossPositionMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_LengthOfTimeInUnrealizedLossPositionAxis" xlink:label="cb_LengthOfTimeInUnrealizedLossPositionAxis" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_LengthOfTimeInUnrealizedLossPositionDomain" xlink:label="cb_LengthOfTimeInUnrealizedLossPositionDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TwelveMonthsOrMoreMember" xlink:label="cb_TwelveMonthsOrMoreMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_LessThanTwelveMonthsMember" xlink:label="cb_LessThanTwelveMonthsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" xlink:label="cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="us-gaap_CorporateBondSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" xlink:label="cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="us-gaap_ResidentialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="us-gaap_CommercialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:label="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExempt" xlink:label="cb_TaxExempt" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExemptGrossUnrealizedDepreciation" xlink:label="cb_TaxExemptGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_Taxable" xlink:label="cb_Taxable" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxableGrossUnrealizedDepreciation" xlink:label="cb_TaxableGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesGrossUnrealizedDepreciation" xlink:label="cb_FixedMaturitiesGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturities" xlink:label="cb_FixedMaturities" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="us-gaap_AvailableForSaleSecuritiesEquitySecurities" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_EquitySecuritiesGrossUnrealizedDepreciation" xlink:label="cb_EquitySecuritiesGrossUnrealizedDepreciation" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MarketableSecurities" xlink:label="us-gaap_MarketableSecurities" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturitiesEquitySecuritiesGrossUnrealizedDepreciation" xlink:label="cb_FixedMaturitiesEquitySecuritiesGrossUnrealizedDepreciation" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:to="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" xlink:to="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" xlink:to="cb_FixedMaturitiesAndEquitySecuritiesInUnrealizedLossPositionMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:to="cb_LengthOfTimeInUnrealizedLossPositionAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="cb_LengthOfTimeInUnrealizedLossPositionAxis" xlink:to="cb_LengthOfTimeInUnrealizedLossPositionDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_LengthOfTimeInUnrealizedLossPositionDomain" xlink:to="cb_TwelveMonthsOrMoreMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_LengthOfTimeInUnrealizedLossPositionDomain" xlink:to="cb_LessThanTwelveMonthsMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_CorporateBondSecuritiesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_ResidentialMortgageBackedSecuritiesMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:to="us-gaap_CommercialMortgageBackedSecuritiesMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" order="4" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:to="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_TaxExempt" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_TaxExemptGrossUnrealizedDepreciation" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_Taxable" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_TaxableGrossUnrealizedDepreciation" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_FixedMaturitiesGrossUnrealizedDepreciation" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_FixedMaturities" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesEquitySecurities" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_EquitySecuritiesGrossUnrealizedDepreciation" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="us-gaap_MarketableSecurities" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValueAndGrossUnrealizedDepreciationOfInvestmentsInUnrealizedLossPositionAbstract" xlink:to="cb_FixedMaturitiesEquitySecuritiesGrossUnrealizedDepreciation" order="10" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DisclosureInvestedAssetsDetails4" xlink:title="06044 - Disclosure - Invested Assets (Details 4)">
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" xlink:label="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" xlink:label="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionAxis" xlink:to="cb_AvailableForSaleSecuritiesInUnrealizedLossPositionDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DisclosureInvestedAssetsDetails4" xlink:title="06044 - Disclosure - Invested Assets (Details 4)">
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_LengthOfTimeInUnrealizedLossPositionAxis" xlink:label="cb_LengthOfTimeInUnrealizedLossPositionAxis" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_LengthOfTimeInUnrealizedLossPositionDomain" xlink:label="cb_LengthOfTimeInUnrealizedLossPositionDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="cb_LengthOfTimeInUnrealizedLossPositionAxis" xlink:to="cb_LengthOfTimeInUnrealizedLossPositionDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DisclosureInvestedAssetsDetails4" xlink:title="06044 - Disclosure - Invested Assets (Details 4)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" xlink:label="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis" xlink:to="us-gaap_MajorTypesOfDebtAndEquitySecuritiesDomain" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/FairValuesOfFinancialInstrumentsDetails" xlink:title="0605 - Disclosure - Fair Values of Financial Instruments (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="us-gaap_FairValueByBalanceSheetGroupingTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" xlink:label="us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="us-gaap_FairValueDisclosureItemAmountsDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="us-gaap_CarryingReportedAmountFairValueDisclosureMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="us-gaap_PortionAtFairValueFairValueDisclosureMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="us-gaap_FairValueInputsLevel1Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="us-gaap_FairValueInputsLevel2Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="us-gaap_FairValueInputsLevel3Member" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InvestmentTypeDomain" xlink:label="us-gaap_InvestmentTypeDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" xlink:label="cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="us-gaap_CorporateBondSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" xlink:label="cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="us-gaap_ResidentialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember" xlink:label="us-gaap_CommercialMortgageBackedSecuritiesMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_CarryingValuesAndFairValuesOfFinancialInstrumentsAbstract" xlink:label="cb_CarryingValuesAndFairValuesOfFinancialInstrumentsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="us-gaap_AssetsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InvestmentsAbstract" xlink:label="us-gaap_InvestmentsAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherShortTermInvestments" xlink:label="us-gaap_OtherShortTermInvestments" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FixedMaturities" xlink:label="cb_FixedMaturities" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AvailableForSaleSecuritiesEquitySecurities" xlink:label="us-gaap_AvailableForSaleSecuritiesEquitySecurities" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LiabilitiesAbstract" xlink:label="us-gaap_LiabilitiesAbstract" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongTermDebt" xlink:label="us-gaap_LongTermDebt" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" xlink:label="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TaxExempt" xlink:label="cb_TaxExempt" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_Taxable" xlink:label="cb_Taxable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MarketableSecurities" xlink:label="us-gaap_MarketableSecurities" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_FairValuesOfFinancialInstrumentsTextualsAbstract" xlink:label="cb_FairValuesOfFinancialInstrumentsTextualsAbstract" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_PercentageOfFairValueAmountsForFixedMaturitiesProvidedByPricingService" xlink:label="cb_PercentageOfFairValueAmountsForFixedMaturitiesProvidedByPricingService" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueByBalanceSheetGroupingTable" xlink:to="us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" xlink:to="us-gaap_FairValueDisclosureItemAmountsDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosureItemAmountsDomain" xlink:to="us-gaap_CarryingReportedAmountFairValueDisclosureMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueDisclosureItemAmountsDomain" xlink:to="us-gaap_PortionAtFairValueFairValueDisclosureMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueByBalanceSheetGroupingTable" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:to="us-gaap_FairValueInputsLevel1Member" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:to="us-gaap_FairValueInputsLevel2Member" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:to="us-gaap_FairValueInputsLevel3Member" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_FairValueByBalanceSheetGroupingTable" xlink:to="us-gaap_InvestmentTypeAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeDomain" xlink:to="cb_USGovernmentAndGovernmentAgencyAndAuthorityObligationsMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeDomain" xlink:to="us-gaap_CorporateBondSecuritiesMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeDomain" xlink:to="cb_ForeignGovernmentAndGovernmentAgencyObligationsMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeDomain" xlink:to="us-gaap_ResidentialMortgageBackedSecuritiesMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentTypeDomain" xlink:to="us-gaap_CommercialMortgageBackedSecuritiesMember" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="us-gaap_FairValueByBalanceSheetGroupingTable" order="4" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="cb_CarryingValuesAndFairValuesOfFinancialInstrumentsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_CarryingValuesAndFairValuesOfFinancialInstrumentsAbstract" xlink:to="us-gaap_AssetsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_AssetsAbstract" xlink:to="us-gaap_InvestmentsAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsAbstract" xlink:to="us-gaap_OtherShortTermInvestments" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsAbstract" xlink:to="cb_FixedMaturities" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_InvestmentsAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesEquitySecurities" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_CarryingValuesAndFairValuesOfFinancialInstrumentsAbstract" xlink:to="us-gaap_LiabilitiesAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_LiabilitiesAbstract" xlink:to="us-gaap_LongTermDebt" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:to="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" xlink:to="cb_TaxExempt" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" xlink:to="cb_Taxable" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" xlink:to="cb_FixedMaturities" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" xlink:to="us-gaap_AvailableForSaleSecuritiesEquitySecurities" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValuesOfFixedMaturitiesAndEquitySecuritiesAbstract" xlink:to="us-gaap_MarketableSecurities" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="cb_FairValuesOfFinancialInstrumentsTextualsAbstract" xlink:to="us-gaap_FairValueByBalanceSheetGroupingTable" order="5" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_FairValuesOfFinancialInstrumentsTextualsAbstract" xlink:to="cb_PercentageOfFairValueAmountsForFixedMaturitiesProvidedByPricingService" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/FairValuesOfFinancialInstrumentsDetails" xlink:title="0605 - Disclosure - Fair Values of Financial Instruments (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" xlink:label="us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="us-gaap_FairValueDisclosureItemAmountsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis" xlink:to="us-gaap_FairValueDisclosureItemAmountsDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/FairValuesOfFinancialInstrumentsDetails" xlink:title="0605 - Disclosure - Fair Values of Financial Instruments (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis" xlink:to="us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/FairValuesOfFinancialInstrumentsDetails" xlink:title="0605 - Disclosure - Fair Values of Financial Instruments (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="us-gaap_InvestmentTypeAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InvestmentTypeDomain" xlink:label="us-gaap_InvestmentTypeDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_InvestmentTypeAxis" xlink:to="us-gaap_InvestmentTypeDomain" order="3" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/SegmentsInformationDetails" xlink:title="0606 - Disclosure - Segments Information (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" xlink:label="us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" xlink:label="us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_PropertyAndCasualtyInsuranceMember" xlink:label="cb_PropertyAndCasualtyInsuranceMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingRevenueReconcilingItemAxis" xlink:label="us-gaap_SegmentReportingRevenueReconcilingItemAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" xlink:label="us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_UnderwritingMember" xlink:label="cb_UnderwritingMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationBySegmentAxis" xlink:label="us-gaap_SegmentReportingInformationBySegmentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ReportingSegmentDomain" xlink:label="us-gaap_ReportingSegmentDomain" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_PersonalInsuranceMember" xlink:label="cb_PersonalInsuranceMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_CommercialInsuranceMember" xlink:label="cb_CommercialInsuranceMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_SpecialtyInsuranceMember" xlink:label="cb_SpecialtyInsuranceMember" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TotalInsuranceMember" xlink:label="cb_TotalInsuranceMember" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SupplementaryInsuranceInformationBySegmentLineItems" xlink:label="us-gaap_SupplementaryInsuranceInformationBySegmentLineItems" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="us-gaap_RevenuesAbstract" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_PremiumsEarnedFromInsurance" xlink:label="cb_PremiumsEarnedFromInsurance" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_PremiumsEarnedFromReinsuranceAssumed" xlink:label="cb_PremiumsEarnedFromReinsuranceAssumed" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PremiumsEarnedNetPropertyAndCasualty" xlink:label="us-gaap_PremiumsEarnedNetPropertyAndCasualty" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InterestAndDividendIncomeOperating" xlink:label="us-gaap_InterestAndDividendIncomeOperating" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TotalPropertyAndCasualtyInsuranceRevenues" xlink:label="cb_TotalPropertyAndCasualtyInsuranceRevenues" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_CorporateAndOtherRevenues" xlink:label="cb_CorporateAndOtherRevenues" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GainLossOnInvestments" xlink:label="us-gaap_GainLossOnInvestments" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Revenues" xlink:label="us-gaap_Revenues" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_IncomeBeforeIncomeTaxAbstract" xlink:label="cb_IncomeBeforeIncomeTaxAbstract" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_InsuranceUnderwritingIncome" xlink:label="cb_InsuranceUnderwritingIncome" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_ReinsuranceAssumedUnderwritingIncome" xlink:label="cb_ReinsuranceAssumedUnderwritingIncome" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_StatutoryUnderwritingIncome" xlink:label="cb_StatutoryUnderwritingIncome" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_IncreaseDecreaseInDeferredPolicyAcquisitionCost" xlink:label="cb_IncreaseDecreaseInDeferredPolicyAcquisitionCost" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_TotalUnderwritingIncome" xlink:label="cb_TotalUnderwritingIncome" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_InvestmentIncome" xlink:label="cb_InvestmentIncome" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_OtherIncomeCharges" xlink:label="cb_OtherIncomeCharges" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_PropertyAndCasualtyInsuranceIncomeBeforeTaxesAndCorporateCompanies" xlink:label="cb_PropertyAndCasualtyInsuranceIncomeBeforeTaxesAndCorporateCompanies" />
    <link:loc xlink:type="locator" xlink:href="cb-20100930.xsd#cb_CorporateAndOtherIncomeLoss" xlink:label="cb_CorporateAndOtherIncomeLoss" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" xlink:to="us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" xlink:to="cb_PropertyAndCasualtyInsuranceMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_SegmentReportingRevenueReconcilingItemAxis" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SegmentReportingRevenueReconcilingItemAxis" xlink:to="us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" xlink:to="cb_UnderwritingMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:to="us-gaap_SegmentReportingInformationBySegmentAxis" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="us-gaap_SegmentReportingInformationBySegmentAxis" xlink:to="us-gaap_ReportingSegmentDomain" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReportingSegmentDomain" xlink:to="cb_PersonalInsuranceMember" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReportingSegmentDomain" xlink:to="cb_CommercialInsuranceMember" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReportingSegmentDomain" xlink:to="cb_SpecialtyInsuranceMember" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_ReportingSegmentDomain" xlink:to="cb_TotalInsuranceMember" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="us-gaap_SupplementaryInsuranceInformationBySegmentLineItems" xlink:to="us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" order="4" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementaryInsuranceInformationBySegmentLineItems" xlink:to="us-gaap_RevenuesAbstract" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="cb_PremiumsEarnedFromInsurance" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="cb_PremiumsEarnedFromReinsuranceAssumed" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_PremiumsEarnedNetPropertyAndCasualty" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_InterestAndDividendIncomeOperating" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="cb_TotalPropertyAndCasualtyInsuranceRevenues" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="cb_CorporateAndOtherRevenues" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_GainLossOnInvestments" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_RevenuesAbstract" xlink:to="us-gaap_Revenues" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="us-gaap_SupplementaryInsuranceInformationBySegmentLineItems" xlink:to="cb_IncomeBeforeIncomeTaxAbstract" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_InsuranceUnderwritingIncome" order="1" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_ReinsuranceAssumedUnderwritingIncome" order="2" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_StatutoryUnderwritingIncome" order="3" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_IncreaseDecreaseInDeferredPolicyAcquisitionCost" order="4" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_TotalUnderwritingIncome" order="5" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_InvestmentIncome" order="6" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_OtherIncomeCharges" order="7" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_PropertyAndCasualtyInsuranceIncomeBeforeTaxesAndCorporateCompanies" order="8" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="cb_CorporateAndOtherIncomeLoss" order="9" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="us-gaap_GainLossOnInvestments" order="10" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="cb_IncomeBeforeIncomeTaxAbstract" xlink:to="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" order="11" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/SegmentsInformationDetails" xlink:title="0606 - Disclosure - Segments Information (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" xlink:label="us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" xlink:label="us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SupplementaryInsuranceInformationSegmentNameAxis" xlink:to="us-gaap_SupplementaryInsuranceInformationSegmentNameDomain" order="1" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/SegmentsInformationDetails" xlink:title="0606 - Disclosure - Segments Information (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingRevenueReconcilingItemAxis" xlink:label="us-gaap_SegmentReportingRevenueReconcilingItemAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" xlink:label="us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SegmentReportingRevenueReconcilingItemAxis" xlink:to="us-gaap_SegmentReportingRevenueReconcilingItemNameDomain" order="2" />
  </link:definitionLink>
  <link:definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/SegmentsInformationDetails" xlink:title="0606 - Disclosure - Segments Information (Details)">
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingInformationBySegmentAxis" xlink:label="us-gaap_SegmentReportingInformationBySegmentAxis" />
    <link:loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ReportingSegmentDomain" xlink:label="us-gaap_ReportingSegmentDomain" />
    <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="us-gaap_SegmentReportingInformationBySegmentAxis" xlink:to="us-gaap_ReportingSegmentDomain" order="3" />
  </link:definitionLink>
</link:linkbase>
