Registration Nos. 033-39133

811-06241

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	☐
Pre-Effective Amendment No.	☐
Post-Effective Amendment No. 87	☒

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	☐
Amendment No. 90	☒

(Check appropriate box or boxes.)

LOOMIS SAYLES FUNDS II

(Exact Name of Registrant as Specified in Charter)

888 Boylston Street, Boston, Massachusetts 02199-8197

(Address of principal executive offices) (Zip Code)

Registrant’s Telephone Number, including Area Code (617) 449-2822

Copy to:

Russell Kane, Esq. Natixis Distribution, L.P. 888 Boylston Street Boston, Massachusetts 02199-8197	John M. Loder, Esq. Ropes & Gray 800 Boylston Street Boston, Massachusetts 02199
(Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering

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

☒ immediately upon filing pursuant to paragraph (b)

☐ on (date) 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.

LOOMIS SAYLES FUNDS 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 has duly caused Post-Effective Amendment No. 87 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 21^st day of February, 2019.

LOOMIS SAYLES FUNDS 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	President, Chief
David L. Giunta	Executive Officer and Trustee	February 21, 2019
/s/ Michael C. Kardok
Michael C. Kardok	Treasurer	February 21, 2019
Kevin P. Charleston*
Kevin P. Charleston	Trustee	February 21, 2019
Kenneth A. Drucker*
Kenneth A. Drucker	Trustee, Chairperson of the Board	February 21, 2019
Edmond J. English*
Edmond J. English	Trustee	February 21, 2019
Richard A. Goglia*
Richard A. Goglia	Trustee	February 21, 2019
Wendell J. Knox*
Wendell J. Knox	Trustee	February 21, 2019
Martin T. Meehan*
Martin T. Meehan	Trustee	February 21, 2019
Maureen Mitchell*
Maureen Mitchell	Trustee	February 21, 2019
James P. Palermo*
James P. Palermo	Trustee	February 21, 2019

Erik Sirri*
Erik Sirri	Trustee	February 21, 2019
Peter Smail*
Peter Smail	Trustee	February 21, 2019
Cynthia L. Walker*	Trustee	February 21, 2019
Cynthia L. Walker

*By:	/s/ Russell Kane
	Russell Kane
	Attorney-In-Fact 1
	February 21, 2019

¹ Powers of Attorney for Kevin P. Charleston, Kenneth A. Drucker, Edmond J. English, David L. Giunta, Richard A. Goglia, Wendell J. Knox, Martin T. Meehan, Maureen B. Mitchell, James P. Palermo, Erik R. Sirri, Peter J. Smail and Cynthia L. Walker dated December 5, 2018, effective December 10, 2018, designating John M. Loder, Russell Kane, Kirk Johnson and Michael Kardok as attorneys to sign for each Trustee is incorporated by reference to exhibit (q)(1) to PEA No. 86 filed on January 28, 2019.

Loomis Sayles Funds II

Exhibit Index

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