Inachus or Inachos (Greek: Ίναχος) is:

• Inachos, a former municipality in Greece, Aetolia-Acarnania Regional Unit
• Inachos, a village in Greece, Argolis Regional Unit
• Inachos, a river flowing into the Aegean Sea
• Inachus, a king of Argos and personification of the same named river
• Inachos, a play by Sophocles
• Inachos, a river flowing into the river Achelous
• Inachus (crab), a genus of crabs in the family Inachidae

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