SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

               RULE 23C-2 NOTICE OF INTENTION TO REDEEM SECURITIES

                                       of

                         MFS High Yield Municipal Trust
                500 Boylston Street, Boston, Massachusetts 02116
                    (Address of Principal Executive Offices)

        Registrant's Telephone Number, including Area Code: 617-954-5000
           Susan S. Newton, Massachusetts Financial Services Company,
                500 Boylston Street, Boston, Massachusetts 02116
                     (Name and Address of Agent for Service)

                                    under the

                         Investment Company Act of 1940

                    Investment Company Act File No. 811-4992

                                  ____________

The undersigned registered closed-end investment company hereby notifies the
Securities and Exchange Commission that it intends to redeem securities of which
it is the issuer, as set forth below in accordance with the requirements of Rule
23c-2 under the Investment Company Act of 1940. Such redemption remains subject
to the issuance of a formal notice of redemption, which will contain the
definitive terms and timetable of redemption.

1.   Title of the class of  securities  of MFS High Yield  Municipal  Trust (the
     "Fund") to be redeemed:

Municipal Auction Rate Cumulative Preferred Shares, liquidation preference
$25,000 per share, as identified by series and CUSIP in Appendix A hereto (the
"Shares").

2.   The date on which the securities are to be called or redeemed:

See Appendix A for the dates on which Shares of each series are to be redeemed
(the "Redemption Date").

3.   The applicable provisions of the governing instrument pursuant to which the
     securities are to be called or redeemed:

The Shares are to be redeemed pursuant to Section 11(a)(i) of the Fund's Bylaws.

4.   The  principal  amount or number of  shares  and the basis  upon  which the
     securities to be redeemed are to be selected:

See Appendix A for information concerning the number of Shares of each series
and the aggregate principal amount of Shares of each series intended to be
redeemed. The Depository Trust Company (DTC), holder of record of the Shares,
determines by lottery how the redemption will be allocated among each
participant broker-dealer account that holds Shares and each participant
broker-dealer determines how to allocate each redemption among the holders of
the Shares held by it.

________________________________________________________________________________



                                    SIGNATURE

Pursuant to the requirement of Rule 23c-2 of the Investment Company Act of 1940,
the registrant has duly caused this Notice of Intention to Redeem Securities to
be signed on its behalf by the undersigned on this 22nd day of July, 2008.




                                   MFS HIGH YIELD MUNICIPAL TRUST


                                   By:     /s/ SUSAN S. NEWTON

                                           -----------------------------
                                   Name:   SUSAN S. NEWTON
                                   Title:  ASSISTANT SECRETARY AND
                                           ASSISTANT CLERK


________________________________________________________________________________


                                                                      Appendix A


                                                                   
- -----------------------------------------------------------------------------------------------------------
        Series               CUSIP          Redemption Date    Total Shares to Aggregate Principal Amount
                                                                 be Redeemed         to be Redeemed
- -----------------------------------------------------------------------------------------------------------
          F                195799200           08/21/2008            600              $ 15,000,000
- -----------------------------------------------------------------------------------------------------------