Petronilla Madre
| Name | Petronilla Madre |
| Type | Sailing vessel |
| GRT | 43 tons |
| Country |  Italian |
| Built | 1886 |
| Builder | ???, Pisa |
| Operator | Vizzi Rosario, Trapani |
| History | Wooden schooner. Formerly Costanza. |
U-boat attacks on Sailing vessel Petronilla Madre
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 3 Jun 1917 | U 39 (Walter Forstmann) | Sunk | Stopped and sunk by gunnery in the Straits of Sicily. |
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