Filed pursuant to Rule 424(b)(3)
                                                           File No. 333-102889

PROSPECTUS SUPPLEMENT NO. 4
(To Prospectus dated May 16, 2003)


                           MAGNA ENTERTAINMENT CORP.

                                  $75,000,000
        7 1/4% Convertible Subordinated Notes due December 15, 2009 and
              Shares of Class A Subordinate Voting Stock Issuable
                       upon the Conversion of the Notes

     This prospectus supplement further supplements the prospectus dated May
16, 2003 of Magna Entertainment Corp., as supplemented on October 14, 2003,
December 5, 2003 and January 23, 2004, relating to the sale from time to time
by certain of our securityholders (including their future pledgees, donees,
assignees, transferees or successors) of up to $75,000,000 aggregate principal
amount of our 7 1/4% Convertible Subordinated Notes due December 15, 2009 and
the shares of Class A Subordinate Voting Stock issuable upon conversion of the
notes. You should read this prospectus supplement in conjunction with the
prospectus, and this prospectus supplement is qualified by reference to the
prospectus, except to the extent that the information in this prospectus
supplement supersedes the information contained in the prospectus.

     The table of selling securityholders contained in the prospectus is
hereby amended to add the entities who are named below as selling
securityholders:




                                                                                Number of Shares
                                                                                   of Class A
                                            Aggregate                             Subordinate
                                        Principal Amount                       Voting Stock That
                                       of Notes That May                       May Be Sold Under     Percentage of
                                         Be Sold Under       Percentage of      this Prospectus         Shares
                Name                    this Prospectus    Notes Outstanding          (1)           Outstanding (2)
- ------------------------------------- ------------------ --------------------  -----------------  --------------------

                                                                                             
             DBAG London                   $5,070,000            6.760%             596,470              1.211%




(1)  The number of shares of Class A Subordinate Stock beneficially owned and
     being offered, as set forth in the table, has been determined in
     accordance with Rule 13d-3 under the Securities Exchange Act, includes
     shares of Class A Subordinate Voting Stock into which the notes are
     convertible, and assumes a conversion price of $8.50 per share of Class A
     Subordinate Voting Stock and the payment of cash in lieu of fractional
     shares. In addition, the conversion price of the notes may be adjusted
     under certain circumstances which





     will change the number of shares of Class A Subordinate Voting Stock
     received upon their conversion. See "Description of the Notes -
     Conversion of the Notes" in the prospectus.

(2)  Calculated based on Rule 13d-3(d)(i) of the Securities Exchange Act,
     using 48,674,796 shares of Class A Subordinate Voting Stock outstanding
     as of March 17, 2003. In calculating this percentage for each holder, we
     treated as outstanding the number of shares of Class A Subordinate Voting
     Stock issuable upon the conversion of all that holder's notes, but we did
     not assume conversion of any other holders' notes, or include any other
     shares of Class A Subordinate Voting Stock that may be held by such
     holder. Does not include shares of Class A Subordinate Voting Stock that
     may be issued by us upon redemption or purchase of the notes by us at the
     option of the holder.

     Investing in the notes or shares of our Class A Subordinate Voting Stock
involves risks that are described in the "Risk Factors" section beginning on
page 3 of the prospectus.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS SUPPLEMENT, AND ANY REPRESENTATION TO
THE CONTRARY IS A CRIMINAL OFFENSE.


         The date of this prospectus supplement is February 17, 2004.