Guadiana
| Name | Guadiana |
| Type | Sailing vessel |
| GRT | 326 tons |
| Country |  Portuguese |
| Built | 1916 |
| Builder | J. Da Silva Lapa, Villanova de Gara |
| Operator | J. Mourao, Oporto |
| History | Built as Serrao. |
U-boat attacks on Sailing vessel Guadiana
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 5 Mar 1917 | UC 44 (Kurt Tebbenjohanns) | Sunk | Stopped and set on fire off the south of Ireland | ? - England | wood |
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