In Greek mythology, Eioneus (Ancient Greek: Ἠιονεύς) is a name attributed to the following individuals:

• Eioneus, the Perrhaebian^[1] father of Dia,^[2] see Deioneus.
• Eioneus, son of Magnes^[3] and Philodice, and brother of Eurynomus.^[4] He was one of the suitors of Hippodamia and like all the other suitors before Pelops, he was killed by the princess' father, King Oenomaus of Pisa.^[3]
• Eioneus, son of the sea-god Proteus and father of the Phrygian king Dymas, father of Hecuba.^[5]
• Eioneus, the presumed mythological eponym of the Thracian city of Eion. This character was the father of Rhesus, according to Homer.^[6] One source^[7] identifies him with Strymon, who was more commonly known as father of Rhesus.
• Eioneus, a Greek warrior in the Trojan War who was killed by Hector using a sharp spear which smote his neck.^[8]
• Eioneus or Eion, a Trojan warrior who was killed by Neoptolemus.^[9]

• Naming citation for Jovian asteroid 15440 Eioneus

• Conon, Fifty Narrations, surviving as one-paragraph summaries in the Bibliotheca (Library) of Photius, Patriarch of Constantinople translated from the Greek by Brady Kiesling. Online version at the Topos Text Project.
• Diodorus Siculus, The Library of History translated by Charles Henry Oldfather. Twelve volumes. Loeb Classical Library. Cambridge, Massachusetts: Harvard University Press; London: William Heinemann, Ltd. 1989. Vol. 3. Books 4.59–8. Online version at Bill Thayer's Web Site
• Diodorus Siculus, Bibliotheca Historica. Vol 1-2. Immanel Bekker. Ludwig Dindorf. Friedrich Vogel. in aedibus B. G. Teubneri. Leipzig. 1888-1890. Greek text available at the Perseus Digital Library.
• Homer, The Iliad with an English Translation by A.T. Murray, Ph.D. in two volumes. Cambridge, MA., Harvard University Press; London, William Heinemann, Ltd. 1924. Online version at the Perseus Digital Library.
• Homer, Homeri Opera in five volumes. Oxford, Oxford University Press. 1920. Greek text available at the Perseus Digital Library.
• Pausanias, Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918. ISBN 0-674-99328-4. Online version at the Perseus Digital Library
• Pausanias, Graeciae Descriptio. 3 vols. Leipzig, Teubner. 1903. Greek text available at the Perseus Digital Library.