| Navy | The Royal Navy |
| Type | Submarine |
| Class | O |
| Pennant | N 51 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | |
| 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. Commanding Officers: Lt.Cdr. Donald Emberton Mansfield, RN Cdr. Harold Robson Conway, RN Lt. Guy Claud Ian St Barbe Slade Watkins, RN Lt. Edward Dudley Norman, RN Lt. Hugo Rowland Barnwell Newton, DSC, RN Lt.Cdr. John Robert Garstin Harvey, RN (retired) Lt. Arthur Anthony Duff, RN ??? Lt.Cdr. John Robert Garstin Harvey, RN (retired) ??? Lt. Michael Beauchamp St.John, DSC, RN ??? Lt. Richard Gatehouse, DSC, RN Lt. William Henry Kett, DSC, RN Lt.Cdr. Robert Boyd, DSO, DSC, RN |
| Former name | OA 2 |
Commands listed for HMS Otway (N 51)
Please note that we're still working on this section.
| Commander | From | To | ||
| 1 | Cdr. Harold Robson Conway, RN | 2 Aug 1939 | ??? | |
| 2 | Lt.Cdr. Donald Emberton Mansfield, RN | 5 Mar 1940 | ??? | |
| 3 | Cdr. Harold Robson Conway, RN | ??? | ??? | |
| 4 | Lt. Guy Claud Ian St Barbe Slade Watkins, RN | Jun 1940 | 12 Aug 1940 | |
| 5 | Lt. Edward Dudley Norman, RN | 12 Aug 1940 | ??? | |
| 6 | Lt. Hugo Rowland Barnwell Newton, DSC, RN | ??? | 20 Feb 1941 | |
| 7 | Lt.Cdr. (retired) John Robert Garstin Harvey, RN | 20 Feb 1941 | 6 Nov 1942 | |
| 8 | Lt. Arthur Anthony Duff, RN | 6 Nov 1942 | ??? | |
| 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 | 10 Sep 1944 | 30 Jan 1945 | |
| 12 | Lt. William Henry Kett, DSC, RNR | 30 Jan 1945 | 13 May 1945 | |
| 13 | Lt.Cdr. Robert Boyd, DSC, DSO, RN | 13 May 1945 | Jul 1945 ? | |
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