Thor
| Name | Thor |
| Type | Fishing vessel (sail) |
| GRT | 105 tons |
| Country |  Dutch |
| Built | 1912 |
| Builder | A. de Jong, Vlaardingen |
| Operator | Rederij “Mercurius” (Joost & Frank Pot), Vlaardingen |
| History | Registration: VL 91. Iron hulled. |
U-boat attacks on Fishing vessel (sail) Thor
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 3 Jul 1917 | U 49 (Richard Hartmann) | Sunk | Stopped and sunk by gunnery W of the Shetlands | 60.09N, 05.50W | 0 |
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