<?xml version="1.0" encoding="us-ascii"?>
<!--XBRL document created with Bowne Tagger XBRL Enabler by Bowne Software version 10.0.0.4-->
<!--Based on XBRL 2.1-->
<!--Created on: 11/15/2008 2:21:08 PM-->
<!--Modified on: 11/5/2009 5:20:38 PM-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#StatementsOfIncome" roleURI="http://chubb.com/role/StatementsOfIncome" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#StatementsOfComprehensiveIncome" roleURI="http://chubb.com/role/StatementsOfComprehensiveIncome" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#StatementsOfCashFlows" roleURI="http://chubb.com/role/StatementsOfCashFlows" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#BalanceSheetsParenthetical" roleURI="http://chubb.com/role/BalanceSheetsParenthetical" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#DocumentAndEntityInformation" roleURI="http://chubb.com/role/DocumentAndEntityInformation" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#General" roleURI="http://chubb.com/role/General" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#AdoptionOfNewAccountingPronouncements" roleURI="http://chubb.com/role/AdoptionOfNewAccountingPronouncements" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#SegmentsInformation" roleURI="http://chubb.com/role/SegmentsInformation" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#ContingentLiabilities" roleURI="http://chubb.com/role/ContingentLiabilities" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#EarningsPerShare" roleURI="http://chubb.com/role/EarningsPerShare" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#InvestedAssets" roleURI="http://chubb.com/role/InvestedAssets" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#FairValuesOfFinancialInstruments" roleURI="http://chubb.com/role/FairValuesOfFinancialInstruments" />
  <roleRef xlink:type="simple" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-roles-2009-01-31.xsd#CommonDomainMembersStatementTable" roleURI="http://xbrl.us/us-gaap/role/statement/CommonDomainMembersStatementTable" />
  <arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
  <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" />
  <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" />
  <roleRef xlink:type="simple" xlink:href="cb-20090930.xsd#BalanceSheets" roleURI="http://chubb.com/role/BalanceSheets" />
  <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" />
  <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" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/BalanceSheets" xlink:title="02 - Statement - Consolidated Balance Sheets">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_StatementLineItems" xlink:to="loc_StatementTable" order="1" xbrldt:contextElement="segment" priority="1" />
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/StatementsOfIncome" xlink:title="01 - Statement - Consolidated Statements of Income">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_StatementLineItems" xlink:to="loc_StatementTable" order="1" xbrldt:contextElement="segment" priority="1" />
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/StatementsOfComprehensiveIncome" xlink:title="03 - Statement - Consolidated Statements of Comprehensive Income">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_StatementLineItems" xlink:to="loc_StatementTable" order="1" xbrldt:contextElement="segment" priority="1" />
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/StatementsOfCashFlows" xlink:title="04 - Statement - Consolidated Statements of Cash Flows">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_StatementLineItems" xlink:to="loc_StatementTable" order="1" xbrldt:contextElement="segment" priority="1" />
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/BalanceSheetsParenthetical" xlink:title="021 - Statement - Consolidated Balance Sheets (Parenthetical)">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_StatementLineItems" xlink:to="loc_StatementTable" order="1" xbrldt:contextElement="segment" priority="1" />
  </definitionLink>
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/DocumentAndEntityInformation" xlink:title="00 - Document - Document and Company Information" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/General" xlink:title="0601 - Disclosure - General" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/AdoptionOfNewAccountingPronouncements" xlink:title="0602 - Disclosure - Adoption of New Accounting Pronouncements" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/SegmentsInformation" xlink:title="0605 - Disclosure - Segments Information" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/ContingentLiabilities" xlink:title="0606 - Disclosure - Contingent Liabilities" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/EarningsPerShare" xlink:title="0607 - Disclosure - Earnings Per Share" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/InvestedAssets" xlink:title="0603 - Disclosure - Invested Assets" />
  <definitionLink xlink:type="extended" xlink:role="http://chubb.com/role/FairValuesOfFinancialInstruments" xlink:title="0604 - Disclosure - Fair Values of Financial Instruments" />
  <definitionLink xlink:type="extended" xlink:role="http://xbrl.us/us-gaap/role/statement/CommonDomainMembersStatementTable" xlink:title="http://xbrl.us/us-gaap/role/statement/CommonDomainMembersStatementTable" />
</linkbase>
