    <SEC-DOCUMENT>0001193125-16-700404-index.html : 20160902
    <SEC-HEADER>0001193125-16-700404.hdr.sgml : 20160902
    <ACCEPTANCE-DATETIME>20160902103759
    ACCESSION NUMBER:		0001193125-16-700404
    CONFORMED SUBMISSION TYPE:	N-CSRS
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20160630
    FILED AS OF DATE:		20160902
    DATE AS OF CHANGE:		20160902
    EFFECTIVENESS DATE:		20160902

    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:		161867448

    	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>d211200dncsrs.htm
    <DESCRIPTION>BLACKROCK UTILITY & INFRASTRUCTURE TRUST
    <TEXT>
    Document 1 - file: d211200dncsrs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d211200dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d211200dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d211200dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d211200dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g221260txpg004a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g221260txpg004a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g221260txpg004b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g221260txpg004b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g221260txpg007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g221260txpg007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g221260txpg009.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g221260txpg009.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g221260txpg011.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g221260txpg011.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g221260txpg013.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g221260txpg013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g221260txpg015.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g221260txpg015.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g221260txpg017.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g221260txpg017.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g221260txpg019.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g221260txpg019.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g221260txpg021.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g221260txpg021.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g221260txpg023.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g221260txpg023.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g221260txpg150a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g221260txpg150a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g221260txpg150b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g221260txpg150b.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>