As filed with the Securities and Exchange Commission on April 11, 2013

1933 Act File No. 002-27962

1940 Act File No. 811-01545

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM N-1A
	REGISTRATION STATEMENT UNDER THE SECURITIES ACT of 1933	o
	POST-EFFECTIVE AMENDMENT NO. 131	x
	REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	o
	AMENDMENT NO. 118	x
Eaton Vance Special Investment Trust
(Exact Name of Registrant as Specified in Charter)
Two International Place, Boston, Massachusetts 02110
(Address of Principal Executive Offices)
(617) 482-8260
(Registrant’s Telephone Number)
MAUREEN A. GEMMA
Two International Place, Boston, Massachusetts 02110
(Name and Address of Agent for Service)

 

It is proposed that this filing will become effective pursuant to Rule 485 (check appropriate box):
x	immediately upon filing pursuant to paragraph (b)	o	on (date) pursuant to paragraph (a)(1)
o	on (date) pursuant to paragraph (b)	o	75 days after filing pursuant to paragraph (a)(2)
o	60 days after filing pursuant to paragraph (a)(1)	o	on (date) pursuant to paragraph (a)(2)
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 of 1933, and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Boston, and the Commonwealth of Massachusetts, on April 11, 2013.

Eaton Vance Special Investment Trust

By:  /s/ Duncan W. Richardson

Duncan W. Richardson, President

Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on April 11, 2013.

Signature			Title
/s/ Duncan W. Richardson			President (Chief Executive Officer)
Duncan W. Richardson
/s/ James F. Kirchner			Treasurer (Principal Financial and Accounting Officer)
James F. Kirchner
Signature		Title		Signature	Title
Scott E. Eston*		Trustee		Ronald A. Pearlman*	Trustee
Scott E. Eston				Ronald A. Pearlman
Benjamin C. Esty*		Trustee		Helen Frame Peters*	Trustee
Benjamin C. Esty				Helen Frame Peters
Thomas E. Faust Jr.*		Trustee		Lynn A. Stout*	Trustee
Thomas E. Faust Jr.				Lynn A. Stout
Allen R. Freedman*		Trustee		Harriett Tee Taggart*	Trustee
Allen R. Freedman				Harriett Tee Taggart
William H. Park*		Trustee		Ralph F. Verni*	Trustee
William H. Park				Ralph F. Verni
*By:	/s/ Maureen A. Gemma
	Maureen A. Gemma (As attorney-in-fact)

* Pursuant to a Power of Attorney dated March 1, 2013 filed as Exhibit (q) to the Registrant’s Post-Effective Amendment No. 128 filed February 27, 2013 (Accession No. 0000940394-13-000301) and incorporated herein by reference.

EXHIBIT INDEX

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase