Antonio S.
| Name | Antonio S. |
| Type | Sailing vessel |
| GRT | 175 tons |
| Country |  Italian |
| Built | 1916 |
| Builder | R. Gino, Viareggio |
| Operator | Bianchi & Baumgartner, Genoa |
| History | Wooden barkentine |
U-boat attacks on Sailing vessel Antonio S.
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 27 Jul 1918 | UB 50 (Heinrich Kukat) | Sunk | Stopped and sunk by gunnery off Tunisia | 35.27N, 11.09E |
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