<SEC-DOCUMENT>0001209191-18-006846-index.html : 20180202
<SEC-HEADER>0001209191-18-006846.hdr.sgml : 20180202
<ACCEPTANCE-DATETIME>20180202161835
ACCESSION NUMBER:		0001209191-18-006846
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180131
FILED AS OF DATE:		20180202
DATE AS OF CHANGE:		20180202

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JAECKEL THEODORE R JR
		CENTRAL INDEX KEY:			0001081503

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-07156
		FILM NUMBER:		18570899

	MAIL ADDRESS:	
		STREET 1:		800SCUDDERS MILL ROAD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			08536

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD INVESTMENT QUALITY FUND
		CENTRAL INDEX KEY:			0000891188
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				223196058
		FISCAL YEAR END:			0630

	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>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
Document 1 - file: doc4.html

Document 1 - RAW XML: doc4.xml

</DOCUMENT>
</SEC-DOCUMENT>