| Navy | The Royal Navy |
| Type | Submarine |
| Class | T |
| Pennant | P 312 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | |
| Laid down | 8 Sep 1941 |
| Launched | 29 May 1942 |
| Commissioned | 25 Sep 1942 |
| End service | |
| Loss position | |
| History | Scrapped at Gateshead starting on 26 September 1961. Commanding Officers: Lt. Laurance Edward Herrick, DSC, RN T/Lt. Michael Dent Tattersall, RNVR |
Commands listed for HMS Trespasser (P 312)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Richard Molyneux Favell, RN | 14 Jul 1942 | 14 Oct 1944 |
| 2 | Lt. Laurence Edward Herrick, DSC, RN | 14 Oct 1944 | 10 Jun 1945 |
| 3 | Lt. John Oldham Coote, RN | 10 Jun 1945 | 25 Jun 1945 |
| 4 | Lt.Cdr. Norman Limbury Auchinleck Jewell, DSC, RN | 25 Jun 1945 | 28 Jun 1945 |
| 5 | T/Lt. Michael Dent Tattersall, DSC, RNVR | 28 Jun 1945 | 12 Oct 1945 |
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Noteable events involving Trespasser include:
30 May 1943
While on patrol in the Gulf of Lyon HMS Trespasser (Lt. R.M. Favell, RN) fires three torpedoes (in error) at a dead whale ......... oops !
8 Jun 1943
HMS Trespasser (Lt. R.M. Favell, RN) fires 6 torpedoes at the German auxilary patrol vessel Uj 6073 / Nimeth Allah off Toulon, southern France. The torpedoes however miss their target.
13 Jul 1943
HMS Trespasser (Lt. R.M. Favell, RN) sinks the Italian auxiliary patrol vessel V8 / Filippo (242 GRT) with gunfire about 25 nautical miles south of Bastia, Corsica, France.
At 1135 hours (time zone -2) a large three masted schooner of about 200 tons was sighted in position 42º20'N, 09º50'E. She was laying stopped with her stern to a sea anchor or some sort of buoy. At 1230 hours Trespasser surfaced and opened fire on the schooner with the deck gun. The crew of the schooner abandoned ship and the vessel burst into flames.
(see map)
18 Feb 1944
HMS Trespasser (Lt.Cdr. R.M. Favell, RN) torpedoes and damages the Japanese auxiliary gunboat Eifuku Maru (3520 GRT) off Burma in position 07º55'N, 93º03'E. (see map)