Union
| Name | Union |
| Type | Sailing vessel |
| GRT | 563 tons |
| Country |  Norwegian |
| Built | 1891 |
| Builder | unknown yard in Risør |
| Operator | A/S Union (Jean B. Linaae), Sandefjord |
| History |
U-boat attacks on Sailing vessel Union
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 Dec 1916 | UC 17 (Ralph Wenninger) | Sunk | 40 miles from land between Portland Bill and Start Point | Aquin, Haiti – Le Havre | logwood | 0 |
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