Union
| Name | Union |
| Type | Sailing vessel |
| GRT | 152 tons |
| Country |  Danish |
| Built | 1876 |
| Builder | P. Treemsegaard, Svendborg |
| Operator | C. E. Christensen, Rudkjøbing |
| History | Wooden schooner. |
U-boat attacks on Sailing vessel Union
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 12 Apr 1917 | UC 31 (Otto von Schrader) | Sunk | Stopped and sunk 18 to 20 miles E of Souter Point | West Hartlepool - Aarhus | coal | 0 |
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