The King's Own Royal Border Regiment was an infantry regiment of the British Army in existence from 1959 until 2006, and was part of the King's Division. It was formed at Barnard Castle on 1 October 1959 through the amalgamation of the King's Own Royal Regiment (Lancaster) and the Border Regiment.

The King's Own Royal Regiment (Lancaster) was a line infantry regiment of the British Army. It served under various titles and fought in many wars and conflicts, including both the First and the Second World Wars, from 1680 to 1959. In 1959, the regiment was amalgamated with the Border Regiment to form the King's Own Royal Border Regiment.