Emperor Charles or Emperor Karl may refer to:
Charlemagne (742–814), first Holy Roman Emperor Charles the Bald (823–877), counted as Emperor Charles II Charles the Fat (839–888), counted as Emperor Charles III Charles IV, Holy Roman Emperor (1316–1378) Charles V, Holy Roman Emperor (1500–1558) Charles VI, Holy Roman Emperor (1685–1740) Charles VII, Holy Roman Emperor (1697–1745) Charles I of Austria (1887–1922), Emperor of Austria, King of Hungary and Bohemia Charles of Valois, titular Emperor of Constantinople Emperor Charles (film), a 1921 Austrian silent film