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                                  UNITED STATES
                       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



                            SI FINANCIAL GROUP, INC.
                            ------------------------
             (Exact name of registrant as specified in its charter)



UNITED STATES                                          Applied For
----------------                                       ------------
(state of incorporation or organization)    (I.R.S. Employer Identification No.)


803 Main Street, Willimantic, Connecticut                06226
-------------------------------------------            ----------
(Address of principal executive offices)               (Zip Code)


Securities to be registered pursuant to Section 12(b) of the Act:  None

      If this form relates to the registration of a class of securities pursuant
to Section 12(b) of the Exchange Act and is effective pursuant to General
Instruction A.(c), check the following box.
[  ]
      If this form relates to the registration of a class of securities pursuant
to Section 12(g) of the Exchange Act and is effective pursuant to General
Instruction A.(d), check the following box.
[ X ]
      Securities Act registration statement file number to which this form
relates: 333-116381.

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

                     COMMON STOCK, PAR VALUE $.01 PER SHARE
                     --------------------------------------
                                (Title of class)





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ITEM 1.     DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

      Incorporated by reference to the portion of the Prospectus under the
heading: "Description of SI Financial Group Capital Stock," filed on June 10,
2004 as part of the Registrant's Registration Statement on Form S-1, No.
333-116381.

ITEM 2.     EXHIBITS.

      1.    Copies of all constituent instruments defining the rights of all the
            holders of each class of such securities, including any contracts or
            other documents which limit or qualify the rights of such holders.

            (a)   Charter

                  Incorporated by reference to Exhibit 3.1 to Registrant's
                  Registration Statement on Form S-1, No. 333-116381, filed on
                  June 10, 2004.

            (b)   Bylaws

                  Incorporated by reference to Exhibit 3.2 to Registrant's
                  Registration Statement on Form S-1, No. 333-116381, filed on
                  June 10, 2004.

            (c)   Plan of Reorganization and Minority Stock Issuance

                  Incorporated by reference to Exhibit 2.1 to Registrant's
                  Registration Statement on Form S-1, No. 333-116381, filed on
                  June 10, 2004.

      2.    A copy of the security to be registered hereunder is incorporated by
            reference to Exhibit 4.1 to Registrant's Registration Statement on
            Form S-1, No. 333-116381, filed on June 10, 2004.



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                                    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.


                              SI FINANCIAL GROUP, INC.
                              ------------------------
                              (Registrant)


                              Date: June 14, 2004


                              By:   /s/ Rheo A. Brouillard
                                    -------------------------------------------
                                    Rheo A. Brouillard
                                    President and Chief Executive Officer