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

PROSPECTUS SUPPLEMENT NO. 3
(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 and
December 5, 2003, 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                     Voting Stock
                             Amount of                     That May Be
                            Notes That                      Sold Under    Percentage of
                            May Be Sold    Percentage of       this          Shares
                            Under this         Notes        Prospectus     Outstanding
        Name                Prospectus      Outstanding         (1)            (2)
- -------------------------  -------------  ---------------  -------------  ---------------
                                                              
 BMO Nesbitt Burns Inc.      $675,000              *           79,411           *
  TD Securities Inc.        $2,250,000            3%          264,705           *


*    Less than one percent (1%)


(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 January 22, 2004.