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