In Greek mythology, Althaemenes was a son of Catreus and brother of Apemosyne.
An oracle told Althaemenes that he would murder his own father. Althaemenes took Apemosyne and left Crete for Rhodes. A despondent Catreus sailed the seas searching for his children. In the middle of the night, his ship stopped at Rhodes and was mistaken for a pirate ship. Althaemenes and others attacked the ship, and the prophesy came to pass; Catreus died at the hands of his son.
