Constantine

In the works of Harry Turtledove, Constantine may refer to:

Historical figures:
 * Constantine IV, historical Byzantine Emperor, appearing in Justinian.
 * Constantine V, historical Byzantine Emperor, referenced in Justinian and in "Farmers' Law".
 * Constantine XI Palaiologos, historical Byzantine Emperor who is a central character in "The Emperor's Return".
 * Constantine II, Antipope, historical figure who is referenced in "Islands in the Sea".

Fictional characters:
 * Constantine Doukas, fictional Byzantine Empire officer who appears in "The Eyes of Argos" in Agent of Byzantium.
 * Constantine Jenkins, a fictional American diplomat stationed in Germany in Hitler's War and West and East''.
 * Constantine Palaiologos, a fictional United States Army soldier who appears in In at the Death.