Kostajnica () is a village in the municipality of Doboj, Republika Srpska, Bosnia and Herzegovina.Official results from the book: Ethnic composition of Bosnia-Herzegovina population, by municipalities and settlements, 1991. census, Zavod za statistiku Bosne i Hercegovine - Bilten no.234, Sarajevo 1991.
Notable people Borislav Paravac (born 1943), politician and former Bosnian president Željko Komšić's mother Danica Stanić (1941–1992) hails from Kostajnica
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