The 21st Kohat Mountain Battery (Frontier Force) was an artillery unit of the British Indian Army. It was raised in 1851 as the No. 2 Horse or Punjab Light Field Battery, Punjab Irregular Force. It became the 21st Kohat Mountain Battery (Frontier Force) in 1903. In 1947, it was transferred to the Pakistan Army, where it exists as the 2nd Royal Kohat Battery (Frontier Force) of 1st (SP) Medium Regiment, Artillery.