    <SEC-DOCUMENT>0001387131-22-003418-index.html : 20220309
    <SEC-HEADER>0001387131-22-003418.hdr.sgml : 20220309
    <ACCEPTANCE-DATETIME>20220309115632
    ACCESSION NUMBER:		0001387131-22-003418
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		10
    CONFORMED PERIOD OF REPORT:	20211231
    FILED AS OF DATE:		20220309
    DATE AS OF CHANGE:		20220309
    EFFECTIVENESS DATE:		20220309

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			GABELLI GLOBAL UTILITY & INCOME TRUST
    		CENTRAL INDEX KEY:			0001282957
    		IRS NUMBER:				320116828
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-21529
    		FILM NUMBER:		22724498

    	BUSINESS ADDRESS:
    		STREET 1:		ONE CORPORATE CENTER
    		CITY:			RYE
    		STATE:			NY
    		ZIP:			10580
    		BUSINESS PHONE:		8149219105

    	MAIL ADDRESS:
    		STREET 1:		ONE CORPORATE CENTER
    		CITY:			RYE
    		STATE:			NY
    		ZIP:			10580
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>glu-ncsr_123121.htm
    <DESCRIPTION>CERTIFIED ANNUAL SHAREHOLDER REPORT
    <TEXT>
    Document 1 - file: glu-ncsr_123121.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CODE ETH
    <SEQUENCE>2
    <FILENAME>ex99-coe.htm
    <DESCRIPTION>CODE OF ETHICS
    <TEXT>
    Document 2 - file: ex99-coe.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>3
    <FILENAME>ex99-certs.htm
    <DESCRIPTION>SECTION 302 CERTIFICATIONS
    <TEXT>
    Document 3 - file: ex99-certs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906 CERT
    <SEQUENCE>4
    <FILENAME>ex99-906cert.htm
    <DESCRIPTION>SECTIOPN 906 CERTIFICATIONS
    <TEXT>
    Document 4 - file: ex99-906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.(C)
    <SEQUENCE>5
    <FILENAME>ex99-c.htm
    <DESCRIPTION>CONSENT OF PRICEWATERHOUSECOOPERS LLP
    <TEXT>
    Document 5 - file: ex99-c.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>gluncsr123121001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: gluncsr123121001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>gluncsr123121002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: gluncsr123121002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>gluncsr123121003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: gluncsr123121003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>gluncsr123121004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: gluncsr123121004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>gluncsr123121005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: gluncsr123121005.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>