Osmaci (Cyrillic: Осмаци) is a village and a municipality located in eastern Republika Srpska, Bosnia and Herzegovina.
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
In 1991, the population of the Osmaci village numbered 2,628 people, including: