Registration Nos. 2-11101

811-00242

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. 166	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	¨
Amendment No. 97	x

(Check appropriate box or boxes.)

NATIXIS FUNDS TRUST II

(Exact Name of Registrant as Specified in Charter)

399 Boylston Street, Boston, Massachusetts 02116

(Address of principal executive offices)(Zip Code)

(617) 449-2810

Registrant’s Telephone Number, including Area Code

Copy to:

Coleen Downs Dinneen, Esq.	John M. Loder, Esq.
NGAM Distribution, L.P.	Ropes & Gray
399 Boylston Street	800 Boylston Street
Boston, Massachusetts 02116	Boston, Massachusetts 02119
(Name and Address of Agent for Service)

Approximate Date of Public Offering

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

x Immediately upon filing pursuant to paragraph (b)

¨ On              pursuant to paragraph (b)

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

¨ On (date) pursuant to paragraph (a)(1)

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

¨ on (date) pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

NATIXIS FUNDS TRUST II

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act and has duly caused this Post-Effective Amendment No. 166 to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Boston, and the Commonwealth of Massachusetts on the 22^nd day of May, 2012.

NATIXIS FUNDS TRUST II
By:	/s/ David L. Giunta
	David L. Giunta
	President and Chief Executive Officer

Pursuant to the requirements of the Securities Act of 1933, as amended, this amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Signature	Title	Date
/s/ David L. Giunta
David L. Giunta	President, Chief Executive Officer and Trustee	May 22, 2012
/s/ Michael C. Kardok
Michael C. Kardok	Treasurer	May 22, 2012
Graham T. Allison, Jr.*
Graham T. Allison, Jr.	Trustee	May 22, 2012
Charles D. Baker*
Charles D. Baker	Trustee	May 22, 2012
Robert J. Blanding *
Robert J. Blanding	Trustee	May 22, 2012
Daniel M. Cain *
Daniel M. Cain	Trustee	May 22, 2012
Kenneth A. Drucker *
Kenneth A. Drucker	Trustee	May 22, 2012
John T. Hailer *
John T. Hailer	Trustee	May 22, 2012

Wendell J. Knox *
Wendell J. Knox	Trustee	May 22, 2012
Sandra O. Moose *
Sandra O. Moose	Trustee, Chairperson of the Board	May 22, 2012
Erik Sirri *
Erik Sirri	Trustee	May 22, 2012
Peter Smail *
Peter Smail	Trustee	May 22, 2012
Cynthia L. Walker *
Cynthia L. Walker	Trustee	May 22, 2012

*By:	/s/ Coleen Downs Dinneen
	Coleen Downs Dinneen Attorney-In-Fact 1,2,3,4,5,6,7 May 22, 2012

¹  Powers of Attorney for Graham T. Allison, Jr., Robert J. Blanding, Daniel M. Cain, John T. Hailer and Sandra O. Moose are incorporated by reference to exhibit (q) to PEA No. 124 to the Registration Statement filed on December 2, 2004.

²  Power of Attorney for Cynthia L. Walker is incorporated by reference to exhibit (q)(2) to PEA No. 128 to the Registration Statement filed on January 30, 2006.

³  Power of Attorney for Kenneth A. Drucker is incorporated by reference to exhibit (q)(4) to PEA No. 136 to the Registration Statement filed on July 17, 2008.

⁴  Power of Attorney for Wendell J. Knox is incorporated by reference to exhibit (q)(4) to PEA No. 143 to the Registration Statement filed on July 15, 2009.

⁵  Power of Attorney for Erik Sirri is incorporated by reference to exhibit (q)(5) to PEA No. 146 to the Registration Statement filed on March 1, 2010.

⁶  Power of Attorney for Peter Smail is incorporated by reference to exhibit (q)(6) to PEA No. 146 to the Registration Statement filed on March 1, 2010.

⁷  Power of Attorney for Charles D. Baker is incorporated by reference to exhibit (q)(7) to PEA No. 154 to the Registration Statement filed on February 25, 2011.

Natixis Funds Trust II

Exhibit Index

Exhibits for Item 28 of Form N-1A

Exhibit	Exhibit Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase