Oštra Luka (Serbian Cyrillic: Оштра Лука) is a village and municipality in Republika Srpska, Bosnia and Herzegovina.

Alongside Oštra Luka, other villages forming the municipality are Batkovci, Budimlić Japra, Donja Kozica, Donja Tramošnja, Duge Njive, Garevica, Gornja Kozica, Gornja Tramošnja, Hadrovci, Halilovci, Hazići, Koprivna, Marini, Mrkalji, Ovanjska, Podvidača, Sasina, Slatina, Stara Rijeka, Škrljevita, Trnova, Usorci, Zenkovići.

Contemporary administrative villages of Batkovci, Donja Kozica, Donja Tramošnja, Gornja Kozica, Gornja Tramošnja, Hadrovci, Koprivna, Mrkalji, Podvidača, Sasina, Slatina, Stara Rijeka, Škrljevita, Trnova, Zenkovići were created by the Inter-Entity Boundary Line between the Oštra Luka and Sanski Most municipality of the Una-Sana Canton.

The boundary creates divided settlements which for administrative purposes function as independent villages while geographically and sociologically forming a single unit.

Una-Sana  Central Bosnia Posavina  Herzegovina-Neretva Tuzla  West Herzegovina Zenica-Doboj  Sarajevo Bosnian Podrinje Canton 10