Eurylochus may refer to:

• Mythological characters
  • Eurylochus (mythology), second-in-command of Odysseus' ship in Homer's Odyssey
  • Eurylochus, one of the sons of Aegyptus and Caliadne. He married (and was murdered by) Autonoe, daughter of Danaus and Polyxo
  • Eurylochus from Zacynthos, one of the suitors of Penelope. He spoke out against Odysseus in the Odyssey
  • Eurylochus, dragon-slayer of the mythological dragon Cychreides on the isle of Salamis
• Historical characters
  • Eurylochus (Thessalian general) (6th century BC), Thessalian general from the Aleuadae family who fought in the First Sacred War
  • Eurylochus (Spartan general) (died 426 BC), Spartan general during the Peloponnesian War, was killed at the Battle of Olpae
  • Eurylochus (4th century BC), a student of Pyrrho along with Hecataeus of Abdera and others (the 'Pyrrhoneans')