EXHIBIT 99.3


                                                                   April 5, 2000


Dear Participant:

     As of March 29, 2000, the trust ("ESOP Trust") established for the Columbia
Federal  Savings  Bank  (now  known as CFS  Bank,  the  "Bank")  Employee  Stock
Ownership  Plan ("ESOP") held 631,925  shares of common stock of Haven  Bancorp,
Inc. (the  "Company"),  the parent holding company for the Bank, for the benefit
of  participants  in the ESOP.  As of the Record Date,  March 29, 2000,  387,560
shares  of  Common  Stock  in the  ESOP  had  been  allocated  to  participating
employees. As a participant in the ESOP, you may direct the voting of the shares
of the Company's common stock held by the ESOP Trust allocated to your account.

     Chase  Manhattan Bank has been  appointed as the corporate  trustee for the
ESOP Trust (the "ESOP Trustee").  We, the Board of Directors,  are forwarding to
you the attached Vote Authorization  Form, provided for the purpose of conveying
your voting  instructions to the ESOP Trustee.  The ESOP Trustee will vote those
shares  of the  Company's  common  stock  held in the ESOP  Trust  allocated  to
participants in accordance with instructions of the participants.

     All unallocated  shares held in the ESOP Trust,  and allocated  shares with
respect  to which no written  instructions  are  received,  will be voted by the
Trustee  in the same  proportion  as those  allocated  shares  for which  voting
instructions  are  received,  so long as such  vote is in  accordance  with  the
provisions of the Employment Retirement Income Security Act of 1974, as amended.

     At this time to direct the voting of shares allocated to your account under
the ESOP,  you must complete and sign the enclosed Vote  Authorization  Form and
return it in the accompanying envelope to Ellen Philip Associates ("Ellen Philip
Associates").  Your vote will not be revealed,  directly or  indirectly,  to any
director, officer or other employee of the Company or the Bank. Your shares will
be tallied by Ellen  Philip  Associates  and then the ESOP Trustee will vote the
shares in the ESOP Trust based on the voting  instructions  it has received from
participants, as described above.



                                                 Sincerely,




                                                 The Board of Directors

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                               HAVEN BANCORP, INC.

                         ANNUAL MEETING OF STOCKHOLDERS
                                  May 17, 2000

                             VOTE AUTHORIZATION FORM


I, having  signed this form,  understand  that the ESOP Trustee is the holder of
record and custodian of all shares of Haven Bancorp, Inc. (the "Company") common
stock  allocated to me under the Columbia  Federal  Savings Bank Employee  Stock
Ownership Plan and Trust ("ESOP  Trust").  Further,  I understand that my voting
instructions are solicited on behalf of the Company's Board of Directors for the
Annual  Meeting of  Stockholders  on May 17,  2000,  and at any  adjournment  or
postponement  thereof.  Accordingly,  you  are  instructed  to vote  all  shares
allocated to me and held by the ESOP Trust as set forth below.

                                                      Please mark your
                                                      votes as indicated   [X]
                                                      in this example

                 THE BOARD OF DIRECTORS RECOMMENDS A VOTE "FOR"
                          EACH OF THE LISTED PROPOSALS.

1.   The Election as directors of all nominees listed:  (Except as marked to the
     contrary  below) Philip S.  Messina,  Msgr.  Thomas J. Hartman,  Michael A.
     McManus, Jr.

         FOR                                                  VOTE WITHHELD
         [_]                                                        [_]

INSTRUCTION:  To  withhold  your vote for any  individual  nominee,  write  that
nominee's name on the space provided below:

- ---------------------------------------

2.   The ratification of the appointment of KPMG LLP as independent  auditors of
     Haven Bancorp, Inc. for the fiscal year ending December 31, 2000.

         FOR                  AGAINST                           ABSTAIN
         [_]                      [_]                             [_]

3.   Approval of the  proposal to adjourn or postpone  the Annual  Meeting  once
     called to order to another time and/or place for the purpose of  soliciting
     additional proxies, if necessary.

         FOR                  AGAINST                           ABSTAIN
         [_]                      [_]                             [_]

I  acknowledge  that I have  received from the Company prior to the execution of
this vote  authorization  form, a Notice of Annual  Meeting of  Stockholders,  a
Proxy  Statement  dated April 5, 2000, the Annual Report to  Stockholders  and a
letter dated April 5, 2000 from the Board of Directors.






I understand that my voting instructions are solicited by the Board of Directors
on behalf of the ESOP Trustee for the Annual Stockholders  Meeting to be held on
May 17, 2000, and at any adjournment or postponement  thereof.  The ESOP Trustee
is hereby  authorized to vote the shares allocated to me, in its trust capacity,
as indicated above.


                                               ---------------------------------
                                               Signature

- ---------------------------------
Date

Please sign, date and return this form in the enclosed business reply envelope.


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