In Greek mythology, Eurybius or Eurybios (Ancient Greek: Εὐρύβιος) was the name of the following personages:
- Eurybius, son of Neleus, king of Pylos and Chloris, one of the Niobids. Along with his brothers, except Nestor, Eurybius was killed by Heracles.
- Eurybius, son of Eurystheus, king of Tiryns and Antimache. He was killed in battle by the Athenians, including his brothers Alexander, Iphimedon, Mentor and Perimedes, in the war that ensued when Athens refused to deliver the Heracleidae up to Eurystheus.
- Eurybius, one of the commanders of horned Lamian Centaurs or Lamian Pheres, offspring of the Lamusides nymphs. He joined Dionysus in his Indian campaign against.