In Greek and Roman mythology, Glaucus (, Glaukos) was a son of Sisyphus whose main myth involved his violent death as the result of his horsemanship. He was a king of Corinth and the subject of a lost tragedy by Aeschylus, Glaucus Potnieus (Glaucus at Potniae), fragments of which are contained in an Oxyrhynchus Papyrus.