SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-A


                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                     PURSUANT TO SECTION 12(b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



                         United Financial Bancorp, Inc.
             (Exact Name of Registrant as Specified in Its Charter)


         Federal                                       83-0395247              
--------------------------------------       ----------------------------------
(State of Incorporation or Organization)    (I.R.S. Employer Identification No.)


         95 Elm Street                           
         West Springfield, Massachusetts                   01089              
------------------------------------------       --------------------------
(Address of Principal Executive Offices)                (Zip Code)

If this form relates to the                If this form relates to the
registration of a class of securities      registration of a class of securities
pursuant to Section 12(b) of the           pursuant to Section 12(g) of the
Exchange Act and is effective              Exchange Act and is effective
pursuant to General Instruction            pursuant to General Instruction
A.(c), please check the following          A.(d), please check the following
box.  [  ]                                 box.  [x]

     Securities  Act  registration  statement  file  number  to which  this form
relates: 333-123371

     Securities to be registered pursuant to Section 12(b) of the Act:

          None                                       N/A                       
 ------------------------------------------------------------------------------
    (Title of Class)                      (Name of Each Exchange on Which
                                           Each Class is to be Registered)

        Securities to be registered pursuant to Section 12(g) of the Act:

                     Common stock, par value $0.01 per share
                     --------------------------------------
                                (Title of Class)





Item 1.  Description of Registrant's Securities to be Registered.
----------------------------------------------------------------

     For a  description  of the  Registrant's  securities,  reference is made to
"Description of Capital Stock of United  Financial  Bancorp,  Inc.," "Our Policy
Regarding  Dividends"  and  "Market  for the Common  Stock" in the  Registrant's
Registration  Statement on Form S-1, as amended (File No. 333-123371),  which is
hereby  incorporated  by reference.  For a description  of the provisions of the
Registrant's  Charter  and  Bylaws  that may  render a change in  control of the
Registrant more difficult, reference is made to "Restrictions on the Acquisition
of  United  Financial  Bancorp,  Inc.  and  United  Bank"  in  the  Registrant's
Registration Statement, as amended.

Item 2.  Exhibits.
-----------------

1.   Registration  Statement on Form S-1 (Registration  Number 333-123371) dated
     March 16, 2005,  as amended on April 27, 2005 and May 13,  2005,  is hereby
     incorporated by reference.

2.   Federal Stock Charter (incorporated by reference to Exhibit 3.1 and Exhibit
     3.2 of the  Registration  Statement on Form S-1 as filed on March 16, 2005,
     as amended on April 27, 2005 and May 13, 2005).

3.   Bylaws  (incorporated  by  reference  to  Exhibit  3.3 of the  Registration
     Statement on Form S-1 as filed on March 16,  2005,  as amended on April 27,
     2005 and May 13, 2005).

4.   Form of Common Stock Certificate (incorporated by reference to Exhibit 4 of
     the  Registration  Statement  on Form S-1 as filed on March  16,  2005,  as
     amended on April 27, 2005 and May 13, 2005).








                                    SIGNATURE


     Pursuant to the  requirements of Section 12 of the Securities  Exchange Act
of 1934 the registrant has duly caused this registration  statement to be signed
on its behalf by the undersigned, thereto duly authorized.


                                           UNITED FINANCIAL BANCORP, INC.



Date:    June 21, 2005                 By: /s/ Richard B. Collins          
                                           -------------------------------------
                                           Richard B. Collins
                                           President and Chief Executive Officer