| Navy | The Royal Navy |
| Type | Minesweeper |
| Class | Algerine |
| Pennant | J 140 |
| Built by | Harland & Wolff Ltd. (Belfast, Northern Ireland) |
| Ordered | 15 Nov 1940 |
| Laid down | 15 Mar 1941 |
| Launched | 5 Feb 1942 |
| Commissioned | 18 May 1942 |
| Lost | 2 Jan 1943 |
| History | HMS Alarm (Lt.Cdr. Russell Patterson, SANF(V)) was bombed by German aircraft off Bone on 2 January 1943 and declared a Constructive Total Loss (CTL). HMS Alarm is not listed as active unit in the April 1943 Navy List Sold to be broken up for scrap in December 1943. |
Commands listed for HMS Alarm (J 140)
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| Commander | From | To | |
| 1 | T/Lt.Cdr. Russell Patterson, SANF(V) | 21 Feb 1942 | early 1943 |
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