<SEC-DOCUMENT>0001133228-25-000577-index.html : 20250128
<SEC-HEADER>0001133228-25-000577.hdr.sgml : 20250128
<ACCEPTANCE-DATETIME>20250128084616
ACCESSION NUMBER:		0001133228-25-000577
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		11
CONFORMED PERIOD OF REPORT:	20241130
FILED AS OF DATE:		20250128
DATE AS OF CHANGE:		20250128
EFFECTIVENESS DATE:		20250128

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Western Asset Investment Grade Opportunity Trust Inc.
		CENTRAL INDEX KEY:			0001462586
		ORGANIZATION NAME:           	
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1130

	FILING VALUES:
		FORM TYPE:		N-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-22294
		FILM NUMBER:		25561102

	BUSINESS ADDRESS:	
		STREET 1:		620 EIGHTH AVENUE
		STREET 2:		47TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10018
		BUSINESS PHONE:		888-777-0102

	MAIL ADDRESS:	
		STREET 1:		620 EIGHTH AVENUE
		STREET 2:		47TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10018

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Western Asset Investment Grade Defined Opportunity Trust Inc.
		DATE OF NAME CHANGE:	20090423
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSR
<SEQUENCE>1
<FILENAME>waigoti-efp13561_ncsr.htm
<DESCRIPTION>WESTERN ASSET INVESTMENT GRADE OPPORTUNITY TRUST INC. (IGI) - N-CSR
<TEXT>
Document 1 - file: waigoti-efp13561_ncsr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CODE ETH
<SEQUENCE>2
<FILENAME>waigoti-efp13561_ex99code.htm
<DESCRIPTION>CODE OF ETHICS
<TEXT>
Document 2 - file: waigoti-efp13561_ex99code.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>3
<FILENAME>waigoti-efp13561_ex99cert.htm
<DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002
<TEXT>
Document 3 - file: waigoti-efp13561_ex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>4
<FILENAME>waigoti-efp13561_ex99906cert.htm
<DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
<TEXT>
Document 4 - file: waigoti-efp13561_ex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>imgf5b5b5be1.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: imgf5b5b5be1.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>img3651a3c52.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: img3651a3c52.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>imgfa8673903.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: imgfa8673903.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>img8c66c2da4.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: img8c66c2da4.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>img77cb8ff35.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: img77cb8ff35.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>img668f07506.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: img668f07506.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>imge469c0547.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: imge469c0547.jpg

</DOCUMENT>
</SEC-DOCUMENT>