Odžak is a town and municipality located in Posavina Canton of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. It is situated in the northern part of Bosnia and Herzegovina, near the river Sava, 10 km from the border with Croatia. The name is derived from Turkish Ocak, during its time as a frontier town of the Ottoman Empire, and means "fireplace" in Turkish and "chimney" in modern Bosnian.