| Navy | The Royal Navy |
| Type | ASW Trawler |
| Class | Dog |
| Pennant | T 10 |
| Built by | Henry Robb Ltd. (Leith, U.K.) |
| Ordered | 27 Jan 1937 |
| Laid down | |
| Launched | 17 Feb 1938 |
| Commissioned | 16 May 1938 |
| Lost | 20 Nov 1939 |
| History | On 20 November 1939 HMT Mastiff (Lt.Cdr. Aymé Arthur Carrington Ouvry, RN) was engaged in the recovery of a mine, which had broken loose from a field laid on the night of 18/11 by German DDs Wilhelm Heidkamp, Hermann Künne and Bernd von Arnim. In the process of hauling it aboard, the mine detonated, destroying the trawler. 5 crew are missing presumed dead, 1 died of wounds and a further 9 are wounded. |
Commands listed for HMS Mastiff (T 10)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. Aymé Arthur Carrington Ouvry, RN | Aug 1939 | 20 Nov 1939 |
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