The Ranger Regiment is a special operations-capable unit of the British Army which was formed on 1 December 2021 under the Future Soldier reform and is part of the Army Special Operations Brigade. It is intended to be used primarily in an unconventional warfare and foreign internal defence capacity in a similar manner to the US Green Berets.

Unconventional warfare (UW) is broadly defined as "military and quasi-military operations other than conventional warfare" and may use covert forces or actions such as subversion, sabotage, espionage, biowarfare, sanctions, propaganda or guerrilla warfare. This is typically done to avoid escalation into conventional warfare as well as international conventions.