Alexander III may refer to:Alexander III of Macedon, also known as Alexander the Great Alexander (870–913), Byzantine emperor Pope Alexander III (1100s–1181) Alexander III of Vladimir, grand duke of Vladimir (1328–1331), prince of Suzdal Alexander III of Scotland (1241–1286), king of Scotland Alexander III of Imereti (1609–1660), king of Imereti Alexander III of Russia (1845–1894), emperor of Russia Pont Alexandre III, an arch bridge that spans the Seine in Paris Russian battleship Imperator Aleksandr III, Russian warship Alexander III of Antioch (1869–1958), Greek Orthodox patriarch of Antioch