| Navy | The Royal Navy |
| Type | Submarine |
| Class | H |
| Pennant | N 33 |
| Built by | Cammell Laird Shipyard (Birkenhead, U.K.) |
| Ordered | Jun 1917 |
| Laid down | 20 Nov 1917 |
| Launched | 24 Aug 1918 |
| Commissioned | 15 Apr 1919 |
| End service | 19 May 1944 |
| Loss position | |
| History | Decommissioned on 19 May 1944. Sold to be broken up for scrap to West of Scotland shipbreakers, Troon, Scotland in October 1944. |
Commands listed for HMS H 33 (N 33)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Herbert James Caldwell, RN | 15 Dec 1938 | Feb 1940 |
| 2 | Lt. Guy Claud Ian St Barbe Slade Watkins, RN | Feb 1940 | 14 Jun 1940 |
| 3 | Lt. Edward Philip Tomkinson, RN | 15 Jun 1940 | 8 Aug 1940 |
| 4 | Lt. Russell Stanhope Brookes, DSC, RN | 8 Aug 1940 | 23 Nov 1940 |
| 5 | Lt. Godfrey Paul Darling, RN | 23 Nov 1940 | 6 Jan 1941 |
| 6 | Lt. Richard Molyneux Favell, RN | 6 Jan 1941 | 6 Mar 1941 |
| 7 | Lt. Christopher Henry Rankin, RN | 6 Mar 1941 | 5 Jul 1941 |
| 8 | Lt. Arthur John Wright Pitt, RN | 5 Jul 1941 | 10 Dec 1941 |
| 9 | Lt. John Henry Bromage, DSC, RN | 10 Dec 1941 | 4 Mar 1942 |
| 10 | Lt. Michael Elliot Faber, RN | 4 Mar 1942 | 9 May 1942 |
| 11 | Lt. Douglas Lambert, DSC, RN | 9 May 1942 | 30 Jul 1942 |
| 12 | Lt. Cyril Astell Pardoe, RNR | 30 Jul 1942 | 2 Aug 1942 |
| 13 | Lt. George Edward Hunt, DSC, RN | 2 Aug 1942 | 14 Aug 1942 |
| 14 | Lt. Hugh Bentley Turner, RN | 14 Aug 1942 | 24 Aug 1942 |
| 15 | T/Lt. Terence Douglas Wood, DSC, RNVR | 24 Aug 1942 | 7 Oct 1942 |
| 16 | Lt. Paul Charles Chapman, DSC, RN | 7 Oct 1942 | 28 Dec 1942 |
| 17 | Lt. Michael Hugh Jupp, DSC, RN | 28 Dec 1942 | 22 Mar 1943 |
| 18 | Lt. John Anthony Spender, RN | 22 Mar 1943 | 20 Jun 1943 |
| 19 | Lt. Michael Robert Russell Kirkwood, RN | 20 Jun 1943 | 2 Sep 1943 |
| 20 | Lt. Derrick George Kent, RN | 2 Sep 1943 | 16 Feb 1944 |
| 21 | Lt. Frank Ronald Lawrence, RN | 16 Feb 1944 | 27 Mar 1944 |
| 22 | Lt. Robert Francis Park, RN | 27 Mar 1944 | 10 Apr 1944 |
| 23 | Lt. Geoffrey James Gellie, RANVR | 10 Apr 1944 | 19 May 1944 |
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