In Greek mythology, Megara (; ) was the oldest daughter of Creon, king of Thebes. In reward for Heracles' defending Thebes from the Minyans at Orchomenus in single-handed, Creon offered his daughter Megara to Heracles, and he brought her home to the house of Amphitryon. She bore him a son and a daughter, whom Heracles killed when Hera struck him with temporary madness; in their hero-tombs in Thebes they were venerated as the Chalkoarai. In some sources Heracles slew Megara too, in others, she was given to Iolaus when Heracles left Thebes forever. She was mother of Leipephilene by Iolaus.