Alcyon
| Name | Alcyon |
| Type | Sailing vessel |
| GRT | 59 tons |
| Country |  French |
| Built | 1909 |
| Builder | Floury, Paimpol |
| Operator | Yves Lahaye, Lezardrieux |
| History | Wooden schooner |
U-boat attacks on Sailing vessel Alcyon
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 14 Nov 1916 | UC 17 (Ralph Wenninger) | Sunk | Stopped and sunk 25 miles north of Ushant | 0 |
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