In Greek mythology, Celaeneus or Kelaineus () was a Mycenaean prince as son of King Electryon. His name was derived from the root kelainós, which means "black," "dark," or "murky".
Celaeneus' mother was Anaxo, daughter of Alcaeus. His brothers were Stratobates, Gorgophonus, Phylonomus, Amphimachus, Lysinomus, Chirimachus, Anactor, Archelaus and Alcmena, mother of the hero Heracles.
Together with his brothers, Celaeneus was killed by the sons of the Taphian king, Pterelaus who claimed the kingdom of their ancestor Mestor, son of Perseus and brother of Electryon.