| Navy | The Royal Navy |
| Type | Motor Gun Boat |
| Class | Fairmile D |
| Pennant | MGB 621 |
| Mod | Motor Gun Boat |
| Built by | James A. Silver Ltd. (Rosneath, Scotland, U.K.) |
| Ordered | 27 Apr 1941 |
| Laid down | |
| Launched | |
| Commissioned | Oct 1942 |
| End service | |
| History | Reclassified as Motor Torpedo Boat MTB 621 in 1943 |
Commands listed for HMS MGB 621 (MGB 621)
Please note that we're still working on this section
and that we only list Commanding Officers for the duration of the Second World War.
| Commander | From | To | |
| 1 | Lt. Louis John Hilary Gamble, DSC, RN | 25 May 1943 | 1 Sep 1943 |
| 2 | J A H Whitby, RNVR | 1 Sep 1943 | mid 1945 |
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