<SEC-DOCUMENT>0001193125-18-198038-index.html : 20180620
<SEC-HEADER>0001193125-18-198038.hdr.sgml : 20180620
<ACCEPTANCE-DATETIME>20180620164605
ACCESSION NUMBER:		0001193125-18-198038
CONFORMED SUBMISSION TYPE:	N-Q
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20180430
FILED AS OF DATE:		20180620
DATE AS OF CHANGE:		20180620
EFFECTIVENESS DATE:		20180620

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-Q
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07156
		FILM NUMBER:		18909939

	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-Q
<SEQUENCE>1
<FILENAME>d544845dnq.htm
<DESCRIPTION>BLACKROCK MUNIYIELD INVESTMENT QUALITY FUND
<TEXT>
Document 1 - file: d544845dnq.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d544845dex99cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
<TEXT>
Document 2 - file: d544845dex99cert.htm

</DOCUMENT>
</SEC-DOCUMENT>