<SEC-DOCUMENT>0001193125-21-105872-index.html : 20210405
<SEC-HEADER>0001193125-21-105872.hdr.sgml : 20210405
<ACCEPTANCE-DATETIME>20210405111903
ACCESSION NUMBER:		0001193125-21-105872
CONFORMED SUBMISSION TYPE:	N-CSRS
PUBLIC DOCUMENT COUNT:		13
CONFORMED PERIOD OF REPORT:	20210131
FILED AS OF DATE:		20210405
DATE AS OF CHANGE:		20210405
EFFECTIVENESS DATE:		20210405

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD INVESTMENT QUALITY FUND
		CENTRAL INDEX KEY:			0000891188
		IRS NUMBER:				223196058
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		N-CSRS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07156
		FILM NUMBER:		21804218

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MUNIYIELD INSURED INVESTMENT FUND
		DATE OF NAME CHANGE:	20080926

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MUNIYIELD FLORIDA INSURED FUND
		DATE OF NAME CHANGE:	20070611

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD FLORIDA INSURED FUND /NJ/
		DATE OF NAME CHANGE:	19921217
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSRS
<SEQUENCE>1
<FILENAME>d112109dncsrs.htm
<DESCRIPTION>BLACKROCK MUNIYIELD INVESTMENT QUALITY FUND
<TEXT>
Document 1 - file: d112109dncsrs.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d112109dex99cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
<TEXT>
Document 2 - file: d112109dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>3
<FILENAME>d112109dex99906cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
<TEXT>
Document 3 - file: d112109dex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g112460g42l24.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g112460g42l24.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g112460gra004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g112460gra004.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g112460gra005.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g112460gra005.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g112460gra009.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g112460gra009.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g112460gra012.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g112460gra012.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g112460gra015.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g112460gra015.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g112460gra018.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g112460gra018.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g112460leaf.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g112460leaf.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>g112460photo_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: g112460photo_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>g112460sig_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: g112460sig_01mips.jpg

</DOCUMENT>
</SEC-DOCUMENT>