San Antonio O.
| Name | San Antonio O. |
| Type | Sailing vessel |
| GRT | 113 tons |
| Country |  Italian |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel San Antonio O.
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Nov 1916 | U 21 (Otto Hersing) | Sunk | N of Sicily |
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