Naupactus or Nafpaktos (Greek: Ναύπακτος, formerly Έπαχτος; Latin: Naupactus; Italian: Lepanto; Turkish: İnebahtı), is a town in Aetolia-Acarnania, West Greece, Greece.

Naupactus is worldwide known from the Naval Battle of Lepanto, which took place on 7 October 1571 when a fleet of the Holy League, a coalition of southern European Catholic maritime states, decisively defeated the main fleet of the Ottoman Empire in five hours of fighting on the northern edge of the Gulf of Corinth, off western Greece.

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