The Commando Training Centre Royal Marines (CTCRM) is the principle military training centre for the Royal Marines. It is situated near the village of Lympstone , between the city of Exeter, and the town of Exmouth in Devon. The centre trains recruits, NCOs, and officers of the Royal Marines. In this the Marines differ from the Army and other branches of the services in that Officers basic training is conducted at the same location as that of other ranks.

CTCRM also conducts the 'All Arms Commando Course'. This is a commando training course for non-Royal Marine service personnel: Army, Royal Navy and Royal Air Force personnel scheduled to serve with Royal Marine formations, usually 3 Commando Brigade.

CTCRM also conducts a number of specialist courses, mainly aimed at Royal Marines but also training members of other branches of the services. As well as the well known Commando Course CTCRM's range of courses include Platoon weapons instructor, various NCO courses, PTI (Physical Training Instructor), Driver, Signals and Snipers. The latter course trains not only Royal Marine snipers but also all SAS snipers. CTCRM has a notably well stocked small arms museum which has examples of most military small arms of the last century or so.

CTCRM is served by Lympstone Commando railway station, which is only open to those having business at the base.