| Navy | The Royal Navy |
| Type | Submarine |
| Class | O |
| Pennant | N 21 |
| Built by | Chatham Dockyard (Chatham, U.K.): |
| Ordered | 1 Nov 1923 |
| Laid down | 22 Mar 1924 |
| Launched | 24 Sep 1926 |
| Commissioned | 24 Aug 1927 |
| End service | 5 Jul 1944 |
| Loss position | |
| History | On 2 August 1939 HMS Oberon was recommissioned after she had been in reserve from 1937. She was mainly used for training. Decommissiond at Blyth on 5 July 1944. Sold to be broken up for scrap on 24 August 1945. Scrapped at Dunston. |
| Former name | O 1 |
Commands listed for HMS Oberon (N 21)
Please note that we're still working on this section.
| Commander | From | To | ||
| Michael Beauchamp St. John, RN | 3 Nov 1941 | |||
| 1 | Lt.Cdr. Henry Carlton Cumberbatch, RN | 2 Aug 1939 | 20 Nov 1939 | |
| 2 | Lt.Cdr. James Anthony Surtees Wise, RN | 20 Nov 1939 | 16 Apr 1940 | |
| 3 | Lt. Peter Ronald Ward, RN | 16 Apr 1940 | 8 May 1940 | |
| 4 | Lt. Cecil Bernard Crouch, RN | 8 May 1940 | 19 Aug 1940 | |
| 5 | Lt.Cdr. Edward Fowle Pizey, DSC, RN | 19 Aug 1940 | 11 Jul 1941 | |
| 6 | Lt.Cdr. George David Archibald Gregory, DSO, RN | 3 Nov 1941 | 17 Nov 1941 | |
| 7 | Lt. Robert Evelyn Boddington, RN | 17 Nov 1941 | 22 Nov 1941 | |
| 8 | Lt.Cdr. Peter Joseph Howell Bartlett, RN | 22 Nov 1941 | 28 Dec 1941 | |
| 9 | Lt.Cdr. Hugh Patrick de Crery Steele, RN | 28 Dec 1941 | 1 Jan 1942 | |
| 10 | Lt. Norman Jack Coe, DSC, RNR | 1 Jan 1942 | 6 Jan 1942 | |
| 11 | Lt.Cdr. Peter Joseph Howell Bartlett, RN | 6 Jan 1942 | ||
| 12 | Lt. Stephen John Fovargue, RN | 4 Jun 1942 | 8 Sep 1942 | |
| 13 | Lt.Cdr. John Wentworth McCoy, DSC, RN | 8 Sep 1942 | 19 Jul 1943 | |
| 14 | Lt.Cdr. John Bertram de Betham Kershaw, DSO, RN | 19 Jul 1943 | 24 Mar 1944 | |
| 15 | Lt. Michael Lindsay Coulton Crawford, DSC, RN | 24 Mar 1944 | ??? | |
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Noteable events involving Oberon include:
11 Oct 1935
Damaged in collision with the destroyer HMS Thanet at Devonport.