Exhibit 99.1350CERT

         CERTIFICATION PURSUANT TO RULE 30A-2(B) UNDER THE 1940 ACT AND
                      SECTION 906 OF THE SARBANES OXLEY ACT

Pursuant to 18 U.S.C. Section 1350, the undersigned officer of BlackRock
Variable Series Funds, Inc. (the "registrant"), hereby certifies, to the best of
his knowledge, that the registrant's Report on Form N-CSR for the period ended
June 30, 2008, (the "Report") fully complies with the requirements of Section
15d of the Securities Exchange Act of 1934, as amended, and that the information
contained in the Report fairly presents, in all material respects, the financial
condition and results of operations of the registrant.

Date: August 22, 2008

/s/ Donald C. Burke
- --------------------------------------------------------
Donald C. Burke
Chief Executive Officer (principal executive officer) of
BlackRock Variable Series Funds, Inc.

Pursuant to 18 U.S.C. Section 1350, the undersigned officer of BlackRock
Variable Series Funds, Inc. (the "registrant"), hereby certifies, to the best of
his knowledge, that the registrant's Report on Form N-CSR for the period ended
June 30, 2008, (the "Report") fully complies with the requirements of Section
15d of the Securities Exchange Act of 1934, as amended, and that the information
contained in the Report fairly presents, in all material respects, the financial
condition and results of operations of the registrant.

Date: August 22, 2008

/s/ Neal J. Andrews
- --------------------------------------------------------
Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock Variable Series Funds, Inc.

This certification is being furnished pursuant to Rule 30a-2(b) under the
Investment Company Act of 1940, as amended, and 18 U.S.C. Section 1350 and is
not being filed as part of the Form N-CSR with the Securities and Exchange
Commission.


                                       20