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

• Eioneus, the Perrhaebian^[1] father of Dia,^[2][3] see Deioneus.
• Eioneus, son of Magnes and Philodice^[4] and one of the suitors of Hippodamia. He, like all of the other suitors before Pelops, was killed by Oenomaus.^[5]
• Eioneus, son of Proteus, father of the Phrygian king Dymas.^[6][7]
• Eioneus, the presumed mythological eponym of the Thracian city of Eion. This character was the father of Rhesus, according to Homer.^[8] One source^[9] 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.^[10]
• Eioneus or Eion, a Trojan warrior who was killed by Neoptolemus.^[11]