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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
 JMt0POfOENUanOIKFO0yIfmMLXtwjkeWL+RcLIkiOyfhF53cRp4hVClU2rkmTXSG
 KW+tdj9F/SdI4RM29vl0KA==

<SEC-DOCUMENT>0000893750-09-000356.txt : 20090612
<SEC-HEADER>0000893750-09-000356.hdr.sgml : 20090612
<ACCEPTANCE-DATETIME>20090612130408
ACCESSION NUMBER:		0000893750-09-000356
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20090625
FILED AS OF DATE:		20090612
DATE AS OF CHANGE:		20090612

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Western Asset Investment Grade Defined Opportunity Trust Inc.
		CENTRAL INDEX KEY:			0001462586
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD

	BUSINESS ADDRESS:	
		STREET 1:		55 WATER ST.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10041
		BUSINESS PHONE:		888-777-0102

	MAIL ADDRESS:	
		STREET 1:		55 WATER ST.
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10041

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			WESTERN ASSET MANAGEMENT CO
		CENTRAL INDEX KEY:			0001138897
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			0331

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-22294
		FILM NUMBER:		09889079

	BUSINESS ADDRESS:	
		STREET 1:		117 E COLORADO BLVD
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91105
		BUSINESS PHONE:		6268449400

	MAIL ADDRESS:	
		STREET 1:		117 E COLORADO BLVD
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91105
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>westernasset_form3ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0203</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2009-06-25</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001462586</issuerCik>
        <issuerName>Western Asset Investment Grade Defined Opportunity Trust Inc.</issuerName>
        <issuerTradingSymbol>IGI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001138897</rptOwnerCik>
            <rptOwnerName>WESTERN ASSET MANAGEMENT CO</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>385 EAST COLORADO BOULEVARD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PASADENA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>91105</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Subadviser to the Fund</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The Reporting Person does not beneficially own any securities of the issuer, directly or indirectly.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ William J. Renahan by Power of Attorney for James W. Hirschmann, Chief Executive Officer, on behalf of Western Asset Management Company</signatureName>
        <signatureDate>2009-06-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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