| Navy | The Royal Navy |
| Type | Submarine |
| Class | H |
| Pennant | N 31 |
| Built by | Vickers (Barrow-in-Furness, U.K.) |
| Ordered | Feb 1917 |
| Laid down | 19 Apr 1917 |
| Launched | 16 Nov 1918 |
| Commissioned | 11 Feb 1919 |
| Lost | 26 Dec 1941 |
| Loss position | |
| History | Took part in patrols off Brest in the Spring of 1941. H 31 (Lt. Frank Bridger Gibbs, RN) sailed from Falmouth and left escort on the 19th December 1941 for a Bay of Biscay patrol, 250 nautical miles north of Cape Finisterre. She was reported overdue on 26 December 1941. The cause of her loss unknown. Possibly a German minefield or drifting British mines. lost with all hands. The date of her loss given is an approximate one. |
Commands listed for HMS H 31 (N 31)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Peter Ronald Ward, RN | 1 Sep 1939 | 5 Jan 1940 |
| 2 | Lt. Malcolm David Wanklyn, RN | 5 Jan 1940 | 25 Jan 1940 |
| 3 | Lt. Rowland John Hemingway, RN | 25 Jan 1940 | 11 Jun 1940 |
| 4 | Lt. Malcolm David Wanklyn, RN | 11 Jun 1940 | 7 Aug 1940 |
| 5 | Lt. Richard Evelyn Coltart, RN | 7 Aug 1940 | 12 Oct 1940 |
| 6 | Lt. Reginald Denis Whiteway-Wilkinson, DSC, RN | 12 Oct 1940 | 20 Apr 1941 |
| 7 | Lt. Rowland John Hemingway, DSC, RN | 20 Apr 1941 | 9 Aug 1941 |
| 8 | Lt. Frank Bridger Gibbs, RN | 9 Aug 1941 | Dec 1941 (+) |
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Noteable events involving H 31 include:
18 Jul 1940
HMS H 31 (Lt. M.D. Wanklyn, RN) torpedoes and sinks the German auxiliary patrol vessel UJ 126/Steiermark (422 GRT) in the North Sea north-west of the Island of Terschelling, Netherlands in position 53º28'N, 05º01'E. (see map)