Vigilant
| Name | Vigilant |
| Type | Pilot boat |
| GRT | 69 tons |
| Country |  British |
| Built | 1879 |
| Builder | ?, Wivenhoe |
| Operator | Corporation of the Trinity House, London |
| History | Wooden ketch. Tonnage is likely net. |
U-boat attacks on Pilot boat Vigilant
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Sep 1915 | UC 7 (Franz Wäger) | Sunk | Mined, 3 cables SE of the South Shipwash Buoy | 14 |
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