| Navy | The Royal Navy |
| Type | MS Trawler |
| Class | [No specific class] |
| Pennant | FY 866 |
| Built by | Smiths Dock Co., Ltd. (South Bank-on-Tees, U.K.) |
| Ordered | |
| Laid down | |
| Launched | 2 Aug 1913 |
| Commissioned | 1940 |
| End service | |
| History | Completed in September 1913. Returned to her owner in March 1946. |
Commands listed for HMS Walwyns Castle (FY 866)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Skr. John McLeman, RNR | 16 Jun 1940 | 17 Jul 1942 |
| 2 | T/Skr. William Fairclough Wright, RNR | 17 Jul 1942 | 7 Sep 1945 |
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