Exhibit 5

LUSE GORMAN POMERENK & SCHICK

A PROFESSIONAL CORPORATION

ATTORNEYS AT LAW

5335 WISCONSIN AVENUE, N.W., SUITE 780

WASHINGTON, D.C. 20015

TELEPHONE (202) 274-2000

FACSIMILE (202) 362-2902

www.luselaw.com

March 28, 2012

Board of Directors

Kaiser Federal Financial Group, Inc.

1359 N. Grand Avenue

Covina, California 91724

Re: Kaiser Federal Financial Group, Inc. - Registration Statement on Form S-8 

Ladies and Gentlemen:

You have requested the opinion of this firm as to certain matters in connection with the registration of common stock, par value $0.01 per share (the “Common Stock”), of Kaiser Federal Financial Group, Inc. (the “Company”) to be issued pursuant to the Kaiser Federal Financial Group, Inc. 2011 Equity Incentive Plan (the “Stock Plan”).

In rendering the opinion expressed herein, we have reviewed the Certificate of Incorporation of the Company, the Stock Plan, the Company’s Registration Statement on Form S-8 (the “Form S-8”), as well as applicable statutes and regulations governing the Company.  We have assumed the authenticity, accuracy and completeness of all documents in connection with the opinion expressed herein.  We have also assumed the legal capacity and genuineness of the signatures of persons signing all documents in connection with which the opinions expressed herein are rendered.

Based on the foregoing, we are of the following opinion:

Following the effectiveness of the Form S-8, the Common Stock of the Company, when issued in connection with the exercise of options granted and the award of restricted stock pursuant to the Stock Plan will be legally issued, fully paid and non-assessable.

This opinion has been prepared solely for the use of the Company in connection with the preparation and filing of the Form S-8, and should not be used for any other purpose or relied upon by any other person without the prior written consent of this firm.  We hereby consent to the use of this opinion in the Form S-8.

Very truly yours,

/s/ Luse Gorman Pomerenk & Schick, P.C.

Luse Gorman Pomerenk & Schick,

A Professional Corporation