The King Alexander's Cup (Romanian: Cupa Regelui Alexandru) or Friendship Cup was an international football competition contested by the national teams of Romania and Yugoslavia.

The tournament was named after Alexander I, the King of Yugoslavia and was organized to celebrate the wedding of King Alexander I of Yugoslavia with the Princess Maria of Romania, the event being announced by the Romanian newspaper, Ecoul Sportiv on 28 May 1922: "On the occasion of the marriage of His Majesty King Alexander I with Her Royal Highness Princess Maria of Romania, His Majesty was pleased to donate a cup that will bear his name, to encourage the progress of the football-association sport in his country and in the country of his wife.

"[1] The 1936, 1937 and 1939 editions were called King Carol's Cup, after Carol II of Romania and the last edition was called King Mihai Cup named after Mihai of Romania.

[2] Between 1937 and 1938, the regular Friendship Cup played between Romania and Yugoslavia was extended to include Czechoslovakia for a mini tournament called Eduard Benes' Cup named after Edvard Beneš, the president of Czechoslovakia.

An extended version of the regular Friendship Cup played between Romania and Yugoslavia.