<SEC-DOCUMENT>0001193125-17-221710-index.html : 20170705
<SEC-HEADER>0001193125-17-221710.hdr.sgml : 20170705
<ACCEPTANCE-DATETIME>20170705113104
ACCESSION NUMBER:		0001193125-17-221710
CONFORMED SUBMISSION TYPE:	N-CSRS
PUBLIC DOCUMENT COUNT:		9
CONFORMED PERIOD OF REPORT:	20170430
FILED AS OF DATE:		20170705
DATE AS OF CHANGE:		20170705
EFFECTIVENESS DATE:		20170705

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK SERIES, INC.
		CENTRAL INDEX KEY:			0001062806
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		N-CSRS
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-08797
		FILM NUMBER:		17946709

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			09809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			09809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY FUNDS INC
		DATE OF NAME CHANGE:	20010827

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY ASSET MANAGEMENT FUNDS INC
		DATE OF NAME CHANGE:	19980714

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERCURY ALPHA FUND INC
		DATE OF NAME CHANGE:	19980601
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0001062806
<SERIES-ID>S000002291
<SERIES-NAME>BlackRock International Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000005981
<CLASS-CONTRACT-NAME>Investor A
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000005983
<CLASS-CONTRACT-NAME>Investor C
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000005984
<CLASS-CONTRACT-NAME>Institutional
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000101856
<CLASS-CONTRACT-NAME>Class R Shares
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>N-CSRS
<SEQUENCE>1
<FILENAME>d383313dncsrs.htm
<DESCRIPTION>BLACKROCK SERIES, INC.
<TEXT>
Document 1 - file: d383313dncsrs.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>d383313dex99cert.htm
<DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
<TEXT>
Document 2 - file: d383313dex99cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.906CERT
<SEQUENCE>3
<FILENAME>d383313dex99906cert.htm
<DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
<TEXT>
Document 3 - file: d383313dex99906cert.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g383313111111.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g383313111111.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g383313dsp_31.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g383313dsp_31.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g383313dsp_32.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g383313dsp_32.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g383313g77h46.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g383313g77h46.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g383313g88a43.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g383313g88a43.gif

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g383313g98u13.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g383313g98u13.jpg

</DOCUMENT>
</SEC-DOCUMENT>