| Navy | The Royal Navy |
| Type | Submarine |
| Class | R-1 |
| Pennant | P 511 |
| Built by | Fore River Shipbuilding Co. (Quincy, Massachusetts, U.S.A.) |
| Ordered | |
| Laid down | 12 Dec 1917 |
| Launched | 18 Jan 1919 |
| Commissioned | 4 Nov 1941 |
| End service | Oct 1944 |
| Loss position | |
| History | USS R-3 was transferred to the Royal Navy on 4 November 1941 at New London. She joined 7th Flotilla at Holy Loch for anti-submarine warfare training in January 1942. In January 1943 she was transferred to Plymouth also for use as an anti-submarine warfare training boat. In October 1944 she was decommissioned and placed in reserve. She was returned to the U.S.N. on 20 December 1944, but she remained laid up in Britain. Scrapped at Troon, Scotland in February 1948. |
| Former name | R-3 |
Commands listed for HMS P 511 (P 511)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt. Bevil Grenfell Heslop, DSC, RN | 4 Nov 1941 | 10 Jan 1942 |
| 2 | Lt. Michael Frederic Roberts Ainslie, DSC, RN | 10 Jan 1942 | 9 Apr 1942 |
| 3 | Lt. Donald Eric Ogilvy Watson, DSC, RN | 9 Apr 1942 | 31 Aug 1942 |
| 4 | Lt. Clifford Raymond Pelly, RN | 31 Aug 1942 | 17 Mar 1943 |
| 5 | Lt. James Stuart Launders, RN | 17 Mar 1943 | 19 May 1943 |
| 6 | Lt. Charles William Taylor, RNR | 19 May 1943 | 29 Jul 1943 |
| 7 | Lt. Raymond Henry Bull, DSC, RN | 29 Jul 1943 | 15 Dec 1943 |
| 8 | Lt. Edward Ashley Hobson, DSC, RN | 15 Dec 1943 |
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