| Navy | The Royal Navy |
| Type | Motor Gun Boat |
| Class | Fairmile D |
| Pennant | MGB 640 |
| Mod | Motor Gun Boat |
| Built by | Wallasea Bay Yacht Station (Rochford, England, U.K.) |
| Ordered | 27 Apr 1941 |
| Laid down | |
| Launched | |
| Commissioned | 1 Nov 1942 |
| Lost | 27 Jun 1944 |
| History | Reclassified as Motor Torpedo Boat MTB 640 in 1943Mined and sunk off Vada, Italy on 27 June 1944 |
Commands listed for HMS MGB 640 (MGB 640)
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 | F W Carr, RNVR | 23 Sep 1942 | 23 Nov 1942 |
| 2 | Lt. Philip Francis Stewart Gould, DSC, RN | 23 Nov 1942 | Apr 1943 |
| 3 | C M MacLachlan, RCNVR | Apr 1943 | 27 Jun 1944 |
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