| Navy | The Royal Navy |
| Type | Minesweeper |
| Class | YMS |
| Pennant | J 821 |
| Built by | Seattle Ship Building and Dry Dock Co. (Seattle, Washington, U.S.A.) |
| Ordered | 11 Jun 1941 |
| Laid down | 11 Aug 1941 |
| Launched | 28 Feb 1942 |
| Commissioned | 3 Aug 1942 |
| End service | |
| History | Returned to the USN on 1 September 1947. |
| Former name | BYMS 21 |
Commands listed for HMS BYMS 2021 (J 821)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Skr. William Walter Cockrill, RNR | 12 Mar 1942 | 1 Oct 1945 |
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