G. C. Gradwell
| Name | G. C. Gradwell |
| Type | Sailing vessel |
| GRT | 156 tons |
| Country |  British |
| Built | 1873 |
| Builder | Cook, Appledore |
| Operator | J. E. Prettyman, St. Austell, Cornwall |
| History | Wooden three-masted schooner. |
U-boat attacks on Sailing vessel G. C. Gradwell
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Aug 1916 | UB 18 (Otto Steinbrinck) | Sunk | Stopped and sunk 20 miles NW of Cape Antifer | in ballast | 0 |
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