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]

• Apollonius Rhodius, Argonautica translated by Robert Cooper Seaton (1853-1915), R. C. Loeb Classical Library Volume 001. London, William Heinemann Ltd, 1912. Online version at the Topos Text Project.
• Apollonius Rhodius, Argonautica. George W. Mooney. London. Longmans, Green. 1912. Greek text available at the Perseus Digital Library.
• Emmi Patsi-Garin The Abridged Dictionary of Greek Mythology (Επίτομο λεξικό Ελληνικής Μυθολογίας), Haris Patsis publishers, Athens 1969
• Quintus Smyrnaeus, The Fall of Troy translated by Way. A. S. Loeb Classical Library Volume 19. London: William Heinemann, 1913. Online version at theio.com
• Quintus Smyrnaeus, The Fall of Troy. Arthur S. Way. London: William Heinemann; New York: G.P. Putnam's Sons. 1913. Greek text available at the Perseus Digital Library.