| Navy | The Royal Navy |
| Type | Submarine |
| Class | S |
| Pennant | P 255 |
| Built by | Scotts Shipbuilding & Engineering Co. (Greenock, Scotland) |
| Ordered | 19 Oct 1942 |
| Laid down | 1 Sep 1943 |
| Launched | 23 Apr 1945 |
| Commissioned | 6 Sep 1945 |
| End service | |
| Loss position | |
| History | HMS Seneschal suffers an explosion on 4 June 1947. Collision with the Danish frigate Thetis south of the Isle of Wight on 14 June 1952. The submarine's periscope and radar mast were damaged. Broken up at Dunston on Tyne on 23 August 1960. |
Commands listed for HMS Seneschal (P 255)
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| Commander | From | To | |
| 1 | Lt. Andrew George Prideaux, DSC, RN | 15 May 1945 | 3 Dec 1945 |
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Noteable events involving Seneschal include:
14 Jun 1952
HMS Seneschal (Lt. Brisley) was surfacing at exactly 2400 on Friday 13th June when she was overrun by the Danish frigate Thetis. Periscopes and radar mast were damaged. The boat was tipped on its side and subsequently crash dived to the sea bed.