| 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.
| 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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