Emperor Alexander may refer to:
Alexander the Great (326-323 BCE), a Macedonian king who conquered the known world Alexander Severus (208–235), a Roman emperor (222-235) of the Severan dynasty Domitius Alexander, Roman usurper who declared himself emperor in 311 Alexander (Byzantine emperor) (ca. 870–913), Byzantine emperor (912–913) Alexander of Trebizond (ca. 1405–1459), Trapezuntine co-emperor (ca. 1451–1459) Alexander I of Russia (1777–1825), Russian emperor (1801–1825) Alexander II of Russia (1818–1881), Russian emperor (1855–1881) Alexander III of Russia (1845–1894), Russian emperor (1881–1894)
See also Emperor Alexius (disambiguation) King Alexander (disambiguation) - any of at least six vessels named for Alexander I of Russia