The Special Boat Service (SBS) is the special forces unit of the United Kingdoms Royal Navy. It is the elite maritime counterterrorism unit of the Royal Navy and is described as the sister unit of the British Army 22 Special Air Service Regiment (22 SAS), with both under the operational control of the Director Special Forces. The SBS can trace its origins back to the Second World War when the Army Special Boat Section was formed in 1940. The SBS has traditionally been staffed mostly by Royal Marines Commandos.

The SBS is part of UKSF, along with the SAS, SRR, and SFSG. The SBS has around 100-200 operators, divided into 4 squadrons: C, X, M, and Z. The SBS has some specialized roles, including swimming, demolitions, diving, infiltrating ships at sea and oil platforms, and parachuting. The SBS is not an independent unit but part of the Royal Marines. To be eligible for SBS selection, a candidate must have served for at least two years in the Marines and then pass a rigorous selection course.

The SBS has been involved in many operations around the world, on land and at sea, often carrying out daring undercover raids. During the allied invasion of Iraq in 2003, SBS teams, working with US Navy Seals, secured and scouted the beaches on the Al Faw Peninsula, paving the way for amphibious landings. Other SBS teams secured the southern oil fields. One Land Rover column of around 60 SBS men, operating in the North, were ambushed by Iraqi forces and had to fight their way out of trouble. The SBS was heavily engaged in Afghanistan, where they targeted Taliban leadership in a series of successful operations.