Pasukan elit paling ternama dalam Tentera British adalah pasukan [[Special Air Service]] ataupun lebih terkenal dengan singkatan SAS. Ditubuhkan dalam tahun 1942, pasukan ini menjadi model untuk banyak pasukan khas negara-negara lain.
===Special Air Service===
ts largest and most famous special forces branch is the The Special Air Service (SAS). The SAS, which was formed in 1942, is seen by many as the role model for every other Special Force in the world.
Today, the regular regiment, 22 SAS Regiment, remains one of the prime anti-terrorist, hostage rescue and covert fighting units in the world. Its headquarters are at the Duke of York Barracks in London whilst the training and depot headquarters are located in Hereford and there is a second Garrison at Wolverhampton. Today it consists of five squadrons: A, B, D, Guard and Reserve.
There are also two reserve SAS regiments in the Territorial Army, 21 SAS Regiment and 23 SAS Regiment. Known as the SAS Reserve, (SAS(R)); they have a slightly different role.
The other special forces unit of the British Army is the Special Reconnaissance Regiment (SRR) which was formed in 2005. This unit specialises in reconnaissance and surveillance on suspected threats to national security and suspected terrorists.
===Special Reconnaissance Regiment===
The Special Reconnaissance Regiment (SRR) is a Special Forces Regiment of the British Army, specialising in Counter-Terrorist surveillance. It became operational on 6 April 2005, and forms part of the United Kingdom Special Forces (UKSF) alongside the Special Air Service (SAS) and Special Boat Service (SBS).