| Navy | The Royal Navy |
| Type | MS Trawler |
| Class | [No specific class] |
| Pennant | FY 806 |
| Built by | John Duthie Torry Shipbuilding Co. Ltd. (Aberdeen, Scotland) |
| Ordered | |
| Laid down | |
| Launched | 19 Sep 1917 |
| Commissioned | Jul 1940 |
| Lost | 25 Oct 1943 |
| History | Completed on 2 November 1917. HMT William Stephen (T/Skr. Samuel Salenius, RNR) was torpedoed and sunk by German motor torpedo boats off Cromer on 25 October 1943. |
Commands listed for HMS William Stephen (FY 806)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | I H Clark, RNR | 13 Aug 1940 | mid 1942 |
| 2 | T/Skr. Ralph Merton Harding, RNR | mid 1942 | 12 Oct 1942 |
| 3 | T/Skr. Frederick Bernard Warman, RNR | 12 Oct 1942 | mid 1943 |
| 4 | T/Skr. John Frederick Peek, RNR | mid 1943 | 18 Aug 1943 |
| 5 | T/Skr. Samuel Salenius, RNR | 18 Aug 1943 | 25 Oct 1943 (+) |
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