Osmaci (Cyrillic: ) is a village and a municipality located in eastern Bosnia and Herzegovina in the Republika Srpska entity of BiH. The municipality was created from part of the territory of the pre-war municipality of Kalesija that was assigned to Republika Srpska by the Dayton Agreement (the other part of the pre-war municipality is now in the Federation of Bosnia and Herzegovina). Bosnia and Herzegovina, sometimes referred to as Bosnia-Herzegovina or simply Bosnia in the West, is a sovereign state in Southern Europe, on the Balkan Peninsula.