| Navy | The Royal Navy |
| Type | Submarine |
| Class | L |
| Pennant | N 23 |
| Built by | Vickers (Barrow-in-Furness, U.K.) |
| Ordered | |
| Laid down | 29 Aug 1917 |
| Launched | 1 Jul 1919 |
| Commissioned | 5 Aug 1924 |
| End service | |
| Loss position | |
| History | Completed at Chatham Dockyard (Chatham, U.K.). Sold to be broken up for scrap in 1946. Foundered off Nova Scotia in May 1946 while on the way to the shipbreakers. |
Commands listed for HMS L 23 (N 23)
Please note that we're still working on this section.
| Commander | From | To | ||
| 1 | Lt. Francis John Brooks, RN | 24 Jul 1939 | 26 Mar 1940 | |
| 2 | Lt. Robert Malcolm Galloway, RN | 14 Jul 1940 | 26 Aug 1940 | |
| 3 | Lt. Michael Lindsay Coulton Crawford, RN | 26 Aug 1940 | Dec 1940 | |
| 4 | Lt. Leslie Frederick Lewis Hill, RNR | Dec 1940 | ||
| 5 | Lt. Thomas Erasmus Barlow, RN | 13 Aug 1941 | 10 Jan 1942 | |
| 6 | Lt. Robert Julian Clutterbuck, RN | 10 Jan 1942 | 6 Mar 1942 | |
| 7 | Lt. Michael Geoffrey Rawson Lumby, RN | 6 Mar 1942 | ||
| 8 | Lt. John Stirling Bridger, RN | 22 Jul 1942 | ||
| 9 | Lt. Alan Hamilton Barnett Anderson, DSC, RNR | 22 Dec 1942 | ||
| 10 | Lt. Huston Roe Murray, RN | May 1943 | 11 Feb 1944 | |
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Noteable events involving L 23 include:
22 Feb 1943
While serving as A/S training target ship on Canada's east coast, HMS L 23 was sent to Philadelphia, USA for a refit.