1st Krajina Corps (Serbian: 1. крајишки корпус, 1. krajiški korpus) was one of the seven corps of the Army of Republika Srpska (VRS). Before implementation into the Army of Republika Srpska the corps was known as 5th Corps of Yugoslav People's Army or Banja Luka Corps. Because of this fact it was successor of the infrastructure, organization and most of the equipment. Main task of the corps was to defend western parts of Republika Srpska, today these area is mostly part of . It was most numbered corps of VRS with between 51.000 and 60.000 soldiers. During the War in Bosnia and Herzegovina 6.997 died, 27.176 wounded and 1.031 soldiers are missing.