| 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
and that we only list Commanding Officers for the duration of the Second World War.
| 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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