Boy Denis
| Name | Boy Denis |
| Type | Fishinng vessel |
| GRT | 41 tons |
| Country |  British |
| Built | 1907 |
| Builder | J.W. & A. Upham, Brixham |
| Operator | Emanuel Harris, Brixham |
| History | Fishing registration: BM 274 |
U-boat attacks on Fishinng vessel Boy Denis
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Apr 1917 | UC 21 (Reinhold Saltzwedel) | Sunk | Stopped and sunk 10 miles SSW of Start Point | 0 |
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