In Greek mythology, Sthenelus refers to four different people.
Son of Perseus and Andromeda. He exiled Amphitryon, lover of his niece, Alcmene, because he killed Sthenelus' brother, Electryon. Thus he became king of Mycenae, and was succeeded by his son Eurystheus, who was famous for the labors he designed for Alcmene's son Heracles.