Unione
| Name | Unione |
| Type | Sailing vessel |
| GRT | 207 tons |
| Country |  Italian |
| Built | 1886 |
| Builder | N. Martinlolich, Lussinpiccolo |
| Operator | B. Lipari, Trapani |
| History | Wooden brigantine. |
U-boat attacks on Sailing vessel Unione
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Apr 1917 | U 33 (Gustav Sieß) | Sunk | off Civita Vecchia | 42.01N, 10.54E |
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