SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

Pre-Effective Amendment No.                     

Post-Effective Amendment No. 24            (File No. 333-131683) þ

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY (ACT OF 1940)

Amendment No. 27                                     (File No. 811-21852)   þ

Columbia Funds Series Trust II

50606 Ameriprise Financial Center

Minneapolis, MN 55474

Scott R. Plummer

5228 Ameriprise Financial Center

Minneapolis, MN 55474

(612) 671-1947

Approximate Date of Proposed Public Offering:

It is proposed that this filing will become effective (check appropriate box)

þ immediately upon filing pursuant to paragraph (b)

o on (date) pursuant to paragraph (b)

o 60 days after filing pursuant to paragraph (a)(1)

o on (date) pursuant to paragraph (a)(1)

o 75 days after filing pursuant to paragraph (a)(2)

o on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

o this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act and the Investment Company Act, the Registrant, COLUMBIA FUNDS SERIES TRUST II, certifies that it meets all of the requirements for effectiveness of this Amendment to its Registration Statement under Rule 485(b) and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Minneapolis, and State of Minnesota and the City of Boston, and the State of Massachusetts on the 20^th day of April, 2011.

COLUMBIA FUNDS SERIES TRUST II

By	/s/ J. Kevin Connaughton
	J. Kevin Connaughton
	President

Pursuant to the requirements of the Securities Act, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on the 20^th day of April, 2011.

Signature	Capacity	Signature	Capacity
/s/ J. Kevin Connaughton      J. Kevin Connaughton	President (Principal Executive Officer)	/s/ Anne P. Jones*      Anne P. Jones	Trustee
/s/ Michael G. Clarke      Michael G. Clarke	Chief Financial Officer (Principal Financial Officer)	/s/ John F. Maher*      John F. Maher	Trustee
/s/ Paul D. Pearson      Paul D. Pearson	Chief Accounting Officer (Principal Accounting Officer)	/s/ Catherine James Paglia*      Catherine James Paglia	Trustee
/s/ Stephen R. Lewis, Jr.*      Stephen R. Lewis, Jr.	Chair of the Board	/s/ Leroy C. Richie*      Leroy C. Richie	Trustee
/s/ Kathleen A. Blatz*      Kathleen A. Blatz	Trustee	/s/ Alison Taunton-Rigby*      Alison Taunton-Rigby	Trustee
/s/ Pamela G. Carlton*      Pamela G. Carlton	Trustee	/s/ William F. Truscott*      William F. Truscott	Trustee
/s/ Patricia M. Flynn*      Patricia M. Flynn	Trustee

* Signed pursuant to Directors/Trustees Power of Attorney, dated April 6, 2010, filed electronically on or about April 29, 2010 as Exhibit (q) to Registrant’s Post-Effective Amendment No. 10 to Registration Statement No. 333-131683, by:

/s/ Scott R. Plummer      Scott R. Plummer

Exhibit Index

Exhibit 101 Risk/Return summary in interactive data format.