|Service branch||Royal Navy|
|Next higher rank||Midshipman|
The rank of officer cadet is held by trainee officers at the Royal Military Academy Sandhurst (Army), at Britannia Royal Naval College in Dartmouth (Navy), and the Royal Air Force College at RAF Cranwell (Airforce).
- Royal Navy
In Britannia Royal Naval College, Dartmouth, the rank is non-substantive and only used in the initial phases of training, after which officers use their substantive rank of Midshipman. Formerly, cadets at the Royal Naval College, Osborne, and Dartmouth, had the substantive rank of "Naval Cadet", or "Cadet, RN" or "Cadet" until passing out of Dartmouth as a midshipman.