787 Seventh Avenue
New York, NY 10019-6099
Tel: 212 728 8000
Fax: 212 728 8111

April 1, 2011

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re: BlackRock Funds II

Registration Statement on Form N-14

Ladies and Gentlemen:

On behalf of BlackRock Funds II, (the “Registrant”), and pursuant to Rule 488 under the Securities Act of 1933, as amended (the “1933 Act”), we hereby transmit for filing with the Securities and Exchange Commission (the “SEC”) the Registrant’s Registration Statement on Form N-14 (the “Registration Statement”) relating to the proposed acquisition by the BlackRock Total Return Portfolio II, a series of the Registrant, of all of the assets of the BlackRock Bond Portfolio and the BlackRock Managed Income Portfolio, each a series of the Registrant, in exchange for the assumption by the BlackRock Total Return Portfolio II of certain stated liabilities and Investor A, Investor B, Investor C, Institutional, BlackRock and Service Shares of the Registrant.

Pursuant to Rule 488, the Registration Statement designates an effective date of May 1, 2011. Should members of the Staff have any questions regarding the enclosed materials, they should call the undersigned at (212) 728-8294.

Sincerely,

/s/ Maria Gattuso

Maria Gattuso

Enclosures

cc: Aaron Wasserman, Esq., BlackRock Advisors, LLC

NEW YORK         WASHINGTON         PARIS         LONDON         MILAN         ROME         FRANKFURT         BRUSSELS

in alliance with Dickson Minto W.S., London and Edinburgh