| Navy | The Royal Navy |
| Type | Submarine |
| Class | S |
| Pennant | P 256 |
| Built by | Scotts Shipbuilding & Engineering Co. (Greenock, Scotland) |
| Ordered | 19 Oct 1942 |
| Laid down | 15 Nov 1943 |
| Launched | 27 Jul 1945 |
| Commissioned | 28 Dec 1945 |
| End service | |
| History | Sold to be broken up for scrap on 28 February 1962. Scrapped at Gillingham, Kent, England. |
Commands listed for HMS Sentinel (P 256)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Guy Stewart Chetwode Clarabut, DSO, RN | Nov 1945 |
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