| Navy | The Royal Navy |
| Type | Submarine |
| Class | H |
| Pennant | N 34 |
| Built by | Cammell Laird Shipyard (Birkenhead, U.K.) |
| Ordered | Jun 1917 |
| Laid down | 20 Nov 1917 |
| Launched | 5 Nov 1918 |
| Commissioned | 19 Sep 1919 |
| End service | |
| Loss position | |
| History | Sold to be broken up for scrap to West of Scotland shipbreakers, Troon, Scotland in July 1945. |
Commands listed for HMS H 34 (N 34)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Basil Tremayne Simons, RN | 3 Jul 1939 | 29 Nov 1939 |
| 2 | Lt. Edward Francis Balston, RN | 29 Nov 1939 | 26 Apr 1940 |
| 3 | Lt. Anthony Foster Collett, RN | 26 Apr 1940 | 18 Sep 1940 |
| 4 | Lt. Lennox William Napier, RN | 18 Sep 1940 | 13 Jan 1941 |
| 5 | Lt. John Symons Huddart, RN | 13 Jan 1941 | 19 Mar 1941 |
| 6 | Lt. Compton Patrick Norman, RN | 19 Mar 1941 | 3 Jun 1941 |
| 7 | Lt. Henry Winter, RN | 3 Jun 1941 | 15 Sep 1941 |
| 8 | Lt. Walter Augustus Phillimore, RN | 15 Sep 1941 | 17 Jan 1942 |
| 9 | Lt. Richard Gatehouse, DSC, RN | 17 Jan 1942 | 13 May 1942 |
| 10 | Lt. Frederick Danford Gordon Challis, DSC, RN | 13 May 1942 | 11 Jun 1942 |
| 11 | Lt. Aston Dalzell Piper, DSC, RNR | 11 Jun 1942 | 24 Aug 1942 |
| 12 | Lt. John Philip Holroyde Oakley, DSC, RN | 24 Aug 1942 | 10 Nov 1942 |
| 13 | Lt. Gordon Maurice Noll, RN | 10 Nov 1942 | 26 Jan 1943 |
| 14 | Lt. John Peter Angell, RN | 26 Jan 1943 | 17 Apr 1943 |
| 15 | T/Lt. Reginald Lewis Willoughby, RNR | 17 Apr 1943 | 15 Jul 1943 |
| 16 | Lt. Barry Charles, RN | 15 Jul 1943 | 7 Dec 1943 |
| 17 | Lt. Richard Lionel Jay, RN | 7 Dec 1943 | 14 Aug 1944 |
| 18 | Lt. Allan Miles Brittain Buxton, RN | 14 Aug 1944 | 4 May 1945 |
| 19 | T/Lt. John David Tweedie, RNVR | 4 May 1945 |
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Noteable events involving H 34 include:
30 Sep 1939
HMS H-34 (Lt. B.T. Simons, RN) fires two torpedoes at what is thought to be a German submarine 15 nautical miles north of Kinnaird Head. Both torpedoes missed. As there was no German submarine in the area the attack appears to be bogus.