| Navy | The Royal Navy |
| Type | Submarine |
| Class | O |
| Pennant | N 51 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | 19 May 1925 |
| Laid down | 24 Aug 1925 |
| Launched | 7 Sep 1926 |
| Commissioned | 9 Sep 1927 |
| End service | |
| Loss position | |
| History | Sold to be broken up for scrap on 24 August 1945. Scrapped at Inverkeithing in September 1945. |
| Former name | OA 2 |
Commands listed for HMS Otway (N 51)
Please note that we're still working on this section.
| Commander | From | To | ||
| Hugh Bentley Turner, RN | 9 Sep 1944 | |||
| 1 | Cdr. Harold Robson Conway, RN | 2 Aug 1939 | 5 Mar 1940 | |
| 2 | Lt.Cdr. Donald Emberton Mansfield, RN | 5 Mar 1940 | 1 Jul 1940 | |
| 3 | Lt. Guy Claud Ian St Barbe Slade Watkins, RN | Jun 1940 | 12 Aug 1940 | |
| 4 | Lt. Edward Dudley Norman, RN | 12 Aug 1940 | 17 Dec 1940 | |
| 5 | Lt. Hugo Rowland Barnwell Newton, RN | 17 Dec 1940 | 20 Feb 1941 | |
| 6 | Lt.Cdr. (retired) John Robert Garstin Harvey, RN | 20 Feb 1941 | 6 Nov 1942 | |
| 7 | Lt. Arthur Anthony Duff, RN | 6 Nov 1942 | ??? | |
| 8 | Lt. John Philip Holroyde Oakley, DSC, RN | 23 Mar 1943 | May 1943 | |
| 9 | Lt.Cdr. (retired) John Robert Garstin Harvey, RN | May 1943 | ||
| 10 | Lt. Michael Beauchamp St. John, DSC, RN | 23 Mar 1944 | ??? | |
| 11 | Lt. Richard Gatehouse, DSC, RN | 9 Sep 1944 | 30 Jan 1945 | |
| 12 | Lt. William Hedley Kett, DSC, RNR | 30 Jan 1945 | 24 May 1945 | |
| 13 | Lt.Cdr. Robert Boyd, DSO, DSC, RN | 13 May 1945 | Jul 1945 ? | |
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