| Navy | The Royal Navy |
| Type | Motor Gun Boat |
| Class | BPB 70 feet-type |
| Pennant | MGB 21 |
| Built by | British Power Boat (Hythe, England, U.K.) |
| Ordered | 4 Sep 1939 |
| Laid down | |
| Launched | |
| Commissioned | 21 Oct 1941 |
| End service | |
| History | Sold in October 1945 |
We don't have any commands listed for HMS MGB 21 (MGB 21)
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