Gradiška (Serbian Cyrillic:Градишка) is a town and municipality in northwestern Bosnia and Herzegovina, part of the Republika Srpska entity. The municipality is geographically located in eastern Krajina region, and the town is situated on the Lijevče plain, on the right bank of the Sava river across from Stara Gradiška, Croatia, and about 40 km (25 mi) north of Banja Luka.