Ayda
| Name | Ayda |
| Type | Sailing vessel |
| GRT | |
| Country |  Portuguese |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Ayda
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Nov 1917 | Sunk | off Villa Nova de Milfontes |
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