| Navy | The Royal Navy |
| Type | Submarine |
| Class | L |
| Pennant | N 27 |
| Built by | Vickers (Barrow-in-Furness, U.K.) |
| Ordered | Dec 1916 |
| Laid down | 1917 |
| Launched | 14 Jun 1919 |
| Commissioned | 25 Mar 1926 |
| End service | |
| Loss position | |
| History | Completed at Chatham Dockyard (Chatham, U.K.). Sold to be broken up for scrap to Metal Industries, Montreal, Canada in July 1946. |
Commands listed for HMS L 27 (N 27)
Please note that we're still working on this section.
| Commander | From | To | ||
| 1 | Lt. Patrick James Cowell, RN | 24 Jul 1939 | 2 Feb 1940 | |
| 2 | Lt. Charles Gordon Walker, RN | 2 Feb 1940 | 29 Feb 1940 | |
| 3 | Lt. Cecil Bernard Crouch, RN | Feb 1940 | 15 Apr 1940 | |
| 4 | Lt. John Dennis Martin, RN | 15 Apr 1940 | 11 Jun 1940 | |
| 5 | Lt. Robert Elphinstone Campbell, RN | 11 Jun 1940 | Oct 1940 | |
| 6 | Lt. John Symons Huddart, RN | Oct 1940 | 11 Jan 1941 | |
| 7 | Lt. Harry Noel Edmonds, RN | 11 Jan 1941 | 10 Aug 1941 | |
| 8 | Lt. Norman Limbury Auchinleck Jewell, RN | 10 Aug 1941 | 2 Jan 1942 | |
| 9 | Lt.Cdr. Richard Michael Eames Pain, RN | 2 Jan 1942 | ||
| 10 | Lt. Geoffrey Deryck Nicholson Milner, DSC, RN | 11 Jul 1942 | 24 Aug 1942 | |
| 11 | Lt. Walter Neal Eade, RNR | 24 Aug 1942 | 30 May 1943 | |
| 12 | Lt. Robert George Pierson Bulkeley, RN | 30 May 1943 | 23 Aug 1943 | |
| 13 | Lt. Marcel Ivan Usher, RN | 23 Aug 1943 | ||
| 14 | Lt. James Newenham Elliott, RN | 28 Apr 1944 | ||
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Noteable events involving L 27 include:
15 Oct 1940
HMS L 27 attacks a German convoy in the English Channel off Cape Barfleur, France. All torpedoes fired missed their target.