| Navy | The Royal Navy |
| Type | Motor minesweeper |
| Class | MMS I |
| Pennant | J 520 |
| Built by | George Forbes (Peterhead, England, U.K.) |
| Ordered | 23 Jan 1940 |
| Laid down | |
| Launched | 28 Dec 1940 |
| Commissioned | 3 Jun 1941 |
| End service | |
| History | Sold in July 1946 |
Commands listed for HMS MMS 20 (J 520)
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 | T/Lt. John Harries Berry, RNR | 21 Apr 1941 | 12 Aug 1942 |
| 2 | T/Lt. Herman Arnold Ledeboer, RNR | 12 Aug 1942 | Oct 1943 |
| 3 | L S Kay, RNVR | Oct 1943 | 18 Jan 1945 |
| 4 | H W Hill, RNVR | 18 Jan 1945 | late 1945 |
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