In Greek mythology, Aleus (or Aleos) was the king of Arcadia, eponym of Alea, and founder of the cult of Athena Alea. He was the grandson of Arcas. His daughter Auge was the mother of the hero Telephus, by Heracles. His sons Amphidamas and Cepheus, and his grandson Ancaeus were Argonauts. Ancaeus was killed by the Calydonian boar.