| Navy | The Royal Navy |
| Type | Patrol vessel |
| Class | Kingfisher |
| Pennant | L 89 / K 89 |
| Built by | William Denny & Brothers (Dumbarton, Scotland) |
| Ordered | 6 Apr 1938 |
| Laid down | 22 Aug 1938 |
| Launched | 6 Jul 1939 |
| Commissioned | 28 Oct 1939 |
| End service | |
| History | Sold 6 June 1950. |
Commands listed for HMS Guillemot (L 89 / K 89)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. Henry Maxwell Darell-Brown, RN | 19 Oct 1939 | 28 Jan 1941 |
| 2 | Lt.Cdr. William Spooner Donald, DSC, RN | 28 Jan 1941 | 11 Jul 1941 |
| 3 | Lt. Samuel Richard le Hunte Lombard-Hobson, RN | 11 Jul 1941 | 25 Jul 1942 |
| 4 | Lt. Hedley Ian Saxton White, RNR | 25 Jul 1942 | early 1945 |
| 5 | T/Lt. Michael Rayner Thwaites, RNVR | early 1945 | mid 1945 |
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