Watchful
| Name | Watchful |
| Type | Fishing vessel |
| GRT | 52 tons |
| Country |  British |
| Built | |
| Builder | |
| Operator | A.J.D. & A.N. Ritchie, Fraserburgh |
| History | Motor fishing vessel. PRN: FR776 |
U-boat attacks on Fishing vessel Watchful
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 6 Jul 1916 | UB 23 (Ernst Voigt) | Sunk | Stopped and sunk 23 miles SExS of the Tyne | 0 |
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