The King Baudouin Stadium (French: Stade Roi Baudouin; Dutch: Koning Boudewijnstadion is a sports ground in Brussels, Belgium. Located in the north-western district of the City of Brussels, it was built to embellish the Heysel/Heizel Plateau in view of the 1935 Brussels International Exposition. It was inaugurated on 23 August 1930, with Crown Prince Leopold attending the opening ceremony. The stadium hosted 70,000 at the time. Its name honours King Baudouin, Leopold's successor as King of the Belgians from 1951 to his death in 1993.

The stadium is located at 135/2, avenue de Marathon/Marathonlaan, on the border of the Bruparck entertainment park (with the Atomium, Mini-Europe miniature park and Kinepolis cinema). It can be accessed from the metro stations Heysel/Heizel and Roi Baudouin/Koning Boudewijn on line 6.