    <SEC-DOCUMENT>0001193125-15-334960-index.html : 20151001
    <SEC-HEADER>0001193125-15-334960.hdr.sgml : 20151001
    <ACCEPTANCE-DATETIME>20151001124504
    ACCESSION NUMBER:		0001193125-15-334960
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		21
    CONFORMED PERIOD OF REPORT:	20150731
    FILED AS OF DATE:		20151001
    DATE AS OF CHANGE:		20151001
    EFFECTIVENESS DATE:		20151001

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD QUALITY FUND III, INC.
    		CENTRAL INDEX KEY:			0000883412
    		IRS NUMBER:				223165131
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-06540
    		FILM NUMBER:		151136249

    	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 III, INC
    		DATE OF NAME CHANGE:	20101109

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK MUNIYIELD INSURED FUND, INC
    		DATE OF NAME CHANGE:	20070612

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIYIELD INSURED FUND INC
    		DATE OF NAME CHANGE:	19920717
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d55325dncsr.htm
    <DESCRIPTION>BLACKROCK MUNIYIELD QUALITY FUND III, INC.
    <TEXT>
    Document 1 - file: d55325dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d55325dex99cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d55325dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d55325dex99906cert.htm
    <DESCRIPTION>CERTIFICATION PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d55325dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYPOL
    <SEQUENCE>4
    <FILENAME>d55325dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
    <TEXT>
    Document 4 - file: d55325dex99proxypol.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CORPGOV
    <SEQUENCE>5
    <FILENAME>d55325dex99corpgov.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE AND ENGAGEMENT PRINCIPLES
    <TEXT>
    Document 5 - file: d55325dex99corpgov.htm

    </DOCUMENT>
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    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g44443photo_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g44443photo_01mips.jpg

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    <SEQUENCE>7
    <FILENAME>g44443sig_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g44443sig_01mips.jpg

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    <SEQUENCE>8
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g57884g03x32.jpg

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    <SEQUENCE>9
    <FILENAME>g57884g12k03.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g57884g12k03.jpg

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    <SEQUENCE>10
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g57884g26e41.jpg

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    <SEQUENCE>11
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g57884g29k39.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g57884g56g25.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g57884g56g25.jpg

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    <SEQUENCE>13
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g57884g65b16.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>14
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    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g57884g74u80.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g57884g98u13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g57884g98u13.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g57884leaf.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g57884leaf.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>17
    <FILENAME>g92408g15l58.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 17 - file: g92408g15l58.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>18
    <FILENAME>g92408g51h77.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 18 - file: g92408g51h77.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>19
    <FILENAME>g92408g51p02.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 19 - file: g92408g51p02.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>20
    <FILENAME>g92408g56e95.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 20 - file: g92408g56e95.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>21
    <FILENAME>g92408g86r34.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 21 - file: g92408g86r34.jpg

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