Boy Jack
| Name | Boy Jack |
| Type | Fishing vessel (smack) |
| GRT | 57 tons |
| Country |  British |
| Built | 1902 |
| Builder | George & Thomas Smith, Rye, Sussex |
| Operator | Alfred John Turner, Lowestoft |
| History | LT 945 |
U-boat attacks on Fishing vessel (smack) Boy Jack
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Jul 1918 | UB 40 (Hans Joachim Emsmann) | Sunk | Stopped and scuttled 4 miles E of the Cross Sands LV | 3 |
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