In Greek mythology, Eteocles (/ᵻˈtiːəkliːz/; Ancient Greek: Ἐτεοκλῆς) was a king of Thebes, the son of Oedipus and either Jocasta or Euryganeia. The name is from earlier *Etewoklewes (Ἐτεϝοκλέϝες), meaning "truly glorious". Tawagalawas is thought to be the Hittite rendition of the name. Oedipus killed his father Laius and married his mother without knowing his relationship to either. When the relationship was revealed, he was expelled from Thebes. The rule passed to his sons Eteocles and Polynices. However, because of a curse from their father, the two brothers did not share the rule peacefully. Eteocles was succeeded by his uncle, Creon.
In the Thebaid, the brothers were cursed by their father for their disrespect towards him on two occasions. The first of these occurred when they served him using the silver table of Cadmus and a golden cup, which he had forbidden. The brothers then sent him the haunch of a sacrificed animal, rather than the shoulder, which he deserved. Enraged, Oedipus prayed to Zeus that the brothers would die by each other's hands. However, in Sophocles's Oedipus at Colonus, Oedipus desired to stay in Thebes but was expelled by Creon. His sons argued over the throne, but Eteocles gained the support of the Thebans and expelled Polynices, who went to Oedipus to ask for his blessing to retake the city, but instead was cursed to die by his brother's hand.