Rio Cavado
| Name | Rio Cavado |
| Type | Sailing vessel |
| GRT | 301 tons |
| Country |  Portuguese |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Rio Cavado
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Oct 1918 | U 139 (Lothar von Arnauld de la Perière) | Sunk | 290 miles off Cape Prior |
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