Alfonso
| Name | Alfonso |
| Type | Sailing vessel |
| GRT | 230 tons |
| Country |  Italian |
| Built | 1901 |
| Builder | Calamaro, Savona |
| Operator | E. Alessandro Tomei, Viareggio |
| History |
U-boat attacks on Sailing vessel Alfonso
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 May 1917 | U 34 (Johannes Klasing) | Sunk | Stopped and scuttled 10 miles off Denia, SE of Valencia | 39.00N, 00.10E | Oran - Leghorn |
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