Actaeus (; Ancient Greek: Ἀκταῖος, romanized: Aktaîos, lit. 'coast-man') was the name of three individuals appearing in Greek mythology:
Actaeus, a king of Attica.
Actaeus, father of Telamon by Glauce, daughter of Cychreus. He was the grandfather of Ajax of Salamis.
Actaeus, one of the Telchines.