This is a list of Officer Cadet Training Units, or OCTUs, which were military establishments for training future commissioned officers of the British Army, the British Indian Army, and the Royal Air Force.
British Army
102 (Westminster Dragoons) Officer Cadet Training Unit (TA), was at Westminster
133 (AA) Officer Cadet Training Unit was at Shrivenham during the Second World War and trained cadets in Anti-Aircraft work
148 Pre-Officer Cadet Training Unit Training Establishment was created in 1942 at Wrotham Park, Hertfordshire, to standardize the first stage of cadet training; cadets went there for initial training and then proceeded to a specialist OCTU.
161 Infantry Officer Cadet Training Unit (RMC), established in 1939, later became the Mons Officer Cadet Training Unit (Aldershot), which in 1960 was merged into the Mons Officer Cadet School.
163 Officer Cadet Training Unit was formed during the Second World War from the Artists Rifles
164 Officer Cadet Training Unit was formed in September 1940 at Barmouth, Merionethshire
165 Officer Cadet Training Unit existed during the Second World War at Lauderdale House, Dunbar.
166 Officer Cadet Training Unit was at Colchester from 1939 and later at Douglas, Isle of Man, where it was lent to the Royal Air Force to train officers of the RAF Regiment.
The Eaton Hall Officer Cadet Training Unit was at Eaton Hall, Cheshire, from 1946 until 1960, when it was also merged into the Mons Officer Cadet School.