<SEC-DOCUMENT>0001193125-14-360456-index.html : 20141001
<SEC-HEADER>0001193125-14-360456.hdr.sgml : 20141001
<ACCEPTANCE-DATETIME>20141001131242
ACCESSION NUMBER:		0001193125-14-360456
CONFORMED SUBMISSION TYPE:	N-CSR
PUBLIC DOCUMENT COUNT:		19
CONFORMED PERIOD OF REPORT:	20140731
FILED AS OF DATE:		20141001
DATE AS OF CHANGE:		20141001
EFFECTIVENESS DATE:		20141001

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-CSR
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-07156
		FILM NUMBER:		141132339

	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-CSR
<SEQUENCE>1
<FILENAME>d747462dncsr.htm
<DESCRIPTION>BLACKROCK MUNIYIELD INVESTMENT QUALITY FUND
<TEXT>
Document 1 - file: d747462dncsr.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d747462dex99cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
<TEXT>
Document 2 - file: d747462dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>3
<FILENAME>d747462dex99906cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
<TEXT>
Document 3 - file: d747462dex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.PROXYPOL
<SEQUENCE>4
<FILENAME>d747462dex99proxypol.htm
<DESCRIPTION>PROXY VOTING POLICY
<TEXT>
Document 4 - file: d747462dex99proxypol.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g747448photo_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g747448photo_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g747448sig_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g747448sig_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g747456g03k77.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g747456g03k77.jpg

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<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g747456g09o23.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g747456g09o23.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g747456g24i50.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g747456g24i50.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g747456g26e41.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g747456g26e41.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g747456g28g28.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g747456g28g28.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>g747456g41x70.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: g747456g41x70.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>g747456g42w08.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: g747456g42w08.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>g747456g43r73.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: g747456g43r73.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>g747456g65b16.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: g747456g65b16.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>16
<FILENAME>g747456g85d60.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 16 - file: g747456g85d60.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>17
<FILENAME>g747456g91t63.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 17 - file: g747456g91t63.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>18
<FILENAME>g747456g98u13.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 18 - file: g747456g98u13.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>19
<FILENAME>g747456leaf.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 19 - file: g747456leaf.jpg

</DOCUMENT>
</SEC-DOCUMENT>