| Navy | The Royal Navy |
| Type | Motor Torpedo Boat |
| Class | Higgins 78' |
| Pennant | MTB 421 |
| Built by | Higgins Industies (New Orleans, Louisiana, U.S.A.) |
| Ordered | |
| Laid down | 5 Jun 1942 |
| Launched | 3 Nov 1942 |
| Commissioned | Apr 1943 |
| End service | |
| History | Former USS PT 91. Was to be transferred to the Soviet Union as RPT 7 but convoys to Northern Russia was cancelled so transferred to Great Britain instead. Returned to the USN on 8 September 1945. |
| Former name | USS PT 91 |
We don't have any commands listed for HMS MTB 421 (MTB 421)
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