    <SEC-DOCUMENT>0001193125-21-208687-index.html : 20210706
    <SEC-HEADER>0001193125-21-208687.hdr.sgml : 20210706
    <ACCEPTANCE-DATETIME>20210706155105
    ACCESSION NUMBER:		0001193125-21-208687
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		20
    CONFORMED PERIOD OF REPORT:	20210430
    FILED AS OF DATE:		20210706
    DATE AS OF CHANGE:		20210706
    EFFECTIVENESS DATE:		20210706

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD QUALITY FUND, INC.
    		CENTRAL INDEX KEY:			0000890196
    		IRS NUMBER:				223170744
    		STATE OF INCORPORATION:			NJ
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-06660
    		FILM NUMBER:		211073960

    	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 QUALITY FUND INC
    		DATE OF NAME CHANGE:	20061026

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIYIELD QUALITY FUND INC
    		DATE OF NAME CHANGE:	19920929
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d527442dncsr.htm
    <DESCRIPTION>BLACKROCK MUNIYIELD QUALITY FUND, INC.
    <TEXT>
    Document 1 - file: d527442dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d527442dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d527442dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906 CERT
    <SEQUENCE>3
    <FILENAME>d527442dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d527442dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYPOL
    <SEQUENCE>4
    <FILENAME>d527442dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY AND PROCEDURES
    <TEXT>
    Document 4 - file: d527442dex99proxypol.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.GLOBAL.CORP.GO
    <SEQUENCE>5
    <FILENAME>d527442dex99globalcorpgo.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE & ENGAGEMENT PRINCIPLES
    <TEXT>
    Document 5 - file: d527442dex99globalcorpgo.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.US.CORP.GOV
    <SEQUENCE>6
    <FILENAME>d527442dex99uscorpgov.htm
    <DESCRIPTION>CORPORATE GOVERNANCE AND PROXY VOTING GUIDELINES FOR U.S. SECURITIES
    <TEXT>
    Document 6 - file: d527442dex99uscorpgov.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g508548g00d02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g508548g00d02.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g508548g00d03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g508548g00d03.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g508548g00d05.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g508548g00d05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g508548g00d06.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g508548g00d06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g508548g42l24.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g508548g42l24.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g527400dsp001a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g527400dsp001a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g527400dsp003a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g527400dsp003a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g527400dsp003b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g527400dsp003b.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g527400dsp005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g527400dsp005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g527400dsp007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g527400dsp007.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g527400dsp010.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g527400dsp010.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g527400dsp013.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g527400dsp013.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g527400dsp88a.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g527400dsp88a.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g527400dsp88b.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g527400dsp88b.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>