SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                         ----------------------------


                                   FORM 8-A

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


                     MUNI INTERMEDIATE DURATION FUND, INC.
------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)



         Maryland                                      Applied For
---------------------------                  ---------------------------------
(State of incorporation or                   (IRS employer identification no.)
organization)


Muni Intermediate Duration Fund, Inc.                           08536
800 Scudders Mill Road                                    -----------------
Plainsboro, New Jersey                                       (zip code)
-------------------------------------
(Address of principal executive
offices)

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

Title of each class to be so         Name of each exchange on which each class
registered                           is to be registered
-----------------------------        -----------------------------------------

Common Stock, par value $.10 per     New York Stock Exchange
share

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

None


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

     The section captioned "Description of Capital Stock" in the Registrant's
preliminary prospectus forming a part of Pre-Effective Amendment No. 1 to the
Registrant's Registration Statement on Form N-2 (No. 333-105343) (the
"Registration Statement"), as filed with the Securities and Exchange
Commission (the "Commission") on June 25, 2003 is incorporated herein by
reference.





All requisite approvals and authorizations have been received, and required
supporting documents relating to this transaction have been filed with the New
York Stock Exchange.

Item 2. Exhibits.

     The following exhibits have been filed with the Commission:

          (1)  Form of Certificate of Common Stock.*
          (2)  Portions of the Articles of Incorporation and the By-laws of
               the Registrant defining the rights of holders of shares of
               Common Stock.**














---------
*    Incorporated by reference to Exhibit (d)(2) to the Registration
     Statement.

**   Incorporated by reference to Exhibit (d)(1) to the Registration
     Statement.


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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.


                                   MUNI INTERMEDIATE DURATION FUND, INC.
                                               (Registrant)


                                   By:         /s/ Donald C. Burke
                                        --------------------------------------
                                        By:    Donald C. Burke
                                        Title: Vice President


July 24, 2003


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