The Captain General Royal Marines is the ceremonial head of the Royal Marines. The current incumbent is HRH the Duke of Edinburgh.
The uniform and insignia are those of a Field Marshal.
This position should not be confused with that of the Commandant General Royal Marines, the professional head (who is ranked as a Major-General).
| NATO rank code | Student Officer | OF-1 | OF-2 | OF-3 | OF-4 | OF-5 | OF-6 * |
OF-7 ** |
OF-8 *** |
OF-9 **** |
OF-10 ***** |
||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Royal Navy | Mid | SLt | Lt | Lt Cdr | Cdr | Capt | Cdre | RAdm | VAdm | Adm | Adm of the Fleet | ||
| Royal Marines | 2Lt | Lt | Capt | Maj | Lt Col | Col | Brig | Maj-Gen | Lt-Gen | Gen | |||
| Army | O Cdt | 2Lt | Lt | Capt | Maj | Lt Col | Col | Brig | Maj-Gen | Lt-Gen | Gen | FM | |
| Royal Air Force | OC / SO | APO / Plt Off | Fg Off | Flt Lt | Sqn Ldr | Wg Cdr | Gp Capt | Air Cdre | AVM | Air Mshl | Air Chf Mshl | MRAF | |