Kostajnica can refer to: *

Kostajnica, Bosnia and Herzegovina Kostajnica ( sr-cyr, Костајница) is a town and municipality located in northern Republika Srpska, an entity of Bosnia and Herzegovina.

(formerly Bosanska Kostajnica), a town on the right bank of river Una, in Bosnia *

Hrvatska Kostajnica Hrvatska Kostajnica (; ; ), often just Kostajnica, is a small town in central Croatia. It is located on the Una (Sava), Una river in the Sisak-Moslavina County, south of Petrinja and Sisak and across the river from Kostajnica, Bosnia and Herzegovi ...

, a town on the left bank of river Una, in Croatia *

Kostajnica, Doboj Kostajnica () is a village in the municipality of Doboj, Bosnia and Herzegovina. Notable people * Borislav Paravac (born 1943), politician and former Bosnian president * Željko Komšić Željko Komšić (; born 20 January 1964) is a Bosnian ...

, a village near Doboj, Bosnia and Herzegovina * Kostajnica, Konjic, a village near Konjic, Bosnia and Herzegovina

See also