<SEC-DOCUMENT>0001193125-17-276450-index.html : 20170905
<SEC-HEADER>0001193125-17-276450.hdr.sgml : 20170905
<ACCEPTANCE-DATETIME>20170905125816
ACCESSION NUMBER:		0001193125-17-276450
CONFORMED SUBMISSION TYPE:	N-CSRS
PUBLIC DOCUMENT COUNT:		17
CONFORMED PERIOD OF REPORT:	20170630
FILED AS OF DATE:		20170905
DATE AS OF CHANGE:		20170905
EFFECTIVENESS DATE:		20170905

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BlackRock Utility & Infrastructure Trust
		CENTRAL INDEX KEY:			0001528988
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		N-CSRS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-22606
		FILM NUMBER:		171068070

	BUSINESS ADDRESS:	
		STREET 1:		55 EAST 52ND STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10055
		BUSINESS PHONE:		(800) 882-0052

	MAIL ADDRESS:	
		STREET 1:		55 EAST 52ND STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10055
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSRS
<SEQUENCE>1
<FILENAME>d416307dncsrs.htm
<DESCRIPTION>BLACKROCK UTILITY & INFRASTRUCTURE TRUST
<TEXT>
Document 1 - file: d416307dncsrs.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d416307dex99cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
<TEXT>
Document 2 - file: d416307dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>3
<FILENAME>d416307dex99906cert.htm
<DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
<TEXT>
Document 3 - file: d416307dex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g407214photo_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g407214photo_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g407214sig_01mips.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g407214sig_01mips.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g418959g03h14.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g418959g03h14.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g418959g14o44.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g418959g14o44.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g418959g16t72.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g418959g16t72.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g418959g21a05.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g418959g21a05.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g418959g56l23.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g418959g56l23.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g418959g57b79.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g418959g57b79.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>g418959g65b16.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: g418959g65b16.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>g418959g81d05.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: g418959g81d05.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>g418959g82a35.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: g418959g82a35.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>g418959g83f96.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: g418959g83f96.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>16
<FILENAME>g418959g98u13.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 16 - file: g418959g98u13.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>17
<FILENAME>g418959leaf.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 17 - file: g418959leaf.jpg

</DOCUMENT>
</SEC-DOCUMENT>