    <SEC-DOCUMENT>0001193125-16-488029-index.html : 20160301
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    <ACCEPTANCE-DATETIME>20160301154113
    ACCESSION NUMBER:		0001193125-16-488029
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		26
    CONFORMED PERIOD OF REPORT:	20151231
    FILED AS OF DATE:		20160301
    DATE AS OF CHANGE:		20160301
    EFFECTIVENESS DATE:		20160301

    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-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-22606
    		FILM NUMBER:		161473038

    	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-CSR
    <SEQUENCE>1
    <FILENAME>d100690dncsr.htm
    <DESCRIPTION>BLACKROCK UTILITY & INFRASTRUCTURE TRUST
    <TEXT>
    Document 1 - file: d100690dncsr.htm

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    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d100690dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d100690dex99cert.htm

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    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d100690dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d100690dex99906cert.htm

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    <DOCUMENT>
    <TYPE>EX-99.19.12
    <SEQUENCE>4
    <FILENAME>d100690dex991912.htm
    <DESCRIPTION>SECTION 19(A) NOTICE
    <TEXT>
    Document 4 - file: d100690dex991912.htm

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    <TYPE>EX-99.PROXY.POL
    <SEQUENCE>5
    <FILENAME>d100690dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
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    Document 5 - file: d100690dex99proxypol.htm

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