William Martyn
| Name | William Martyn |
| Type | Sailing vessel |
| GRT | 104 tons |
| Country |  British |
| Built | 1878 |
| Builder | Clemens, Newquay |
| Operator | A. W. Corney, Barnstaple |
| History | Wooden schooner |
U-boat attacks on Sailing vessel William Martyn
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 Mar 1917 | UC 48 (Kurt Ramien) | Sunk | Stopped and scuttled 9 miles SxW1/2W of Ram Head, Youghal | Newport - Cork | coal | 0 |
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