In Greek mythology, Epopeus (; Ancient Greek: Ἐπωπεύς, romanized: Epōpeús, lit. 'all-seer') was the name of the following figures:
Epopeus, king of Sicyon.
Epopeus, king of Lesbos and both father and rapist of Nyctimene.
Epopeus, one of the sailors who tried to delude Dionysus, but were turned into dolphins.
Epopeus, a man from Lemnos, killed by the Lemnian women when they murdered all the men in the island. Epopeus was killed by his own mother.