Deileon (Ancient Greek: Δηιλέων Dēileōn) may refer to two figures in Greek mythology.

• Deileon, a Triccan prince as son of King Deimachus in Thessaly. Along with his brothers, Autolycus and Phlogius, Deileon took part in the campaign of Hercules during the Amazon battles.^[1] These three brothers went astray and stayed at Sinope,^[2] where they later met the Argonauts and joined them on their expedition to Colchis. Plutarch mentioned him as Demoleon.
• Deileon, a Greek henchman of Epeius of Phocis during the Trojan War. He was killed by the hero Aeneas.^[3]