William
| Name | William |
| Type | Sailing vessel |
| GRT | 78 tons |
| Country |  British |
| Built | 1865 |
| Builder | ?, Arklow |
| Operator | Mark Conway, Dublin |
| History | Wooden schooner |
U-boat attacks on Sailing vessel William
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 11 Sep 1917 | UC 51 (Hans Galster) | Sunk | Stopped and sunk 4 miles NWxN Crackington Haven, Cornwall | 50.56N, 04.39W | Cardiff - St. Brieuc | coal | 0 |
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