Operation Una (Croatian: Operacija Una) was a military offensive conducted by the Croatian Army (Hrvatska vojska – HV) against the Army of Republika Srpska (Vojska Republike Srpske – VRS) in western Bosnia and Herzegovina on 18–19 September 1995, during the Bosnian War. The operation entailed a crossing of the Una and Sava rivers to establish bridgeheads at Novi Grad, Bosanska Dubica, Bosanska Kostajnica and opposite Jasenovac to allow for a subsequent advance towards Prijedor and Banja Luka.