Il Dionisio
| Name | Il Dionisio |
| Type | Sailing vessel |
| GRT | 97 tons |
| Country |  Italian |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Il Dionisio
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 7 Jun 1917 | U 33 (Gustav Sieß) | Sunk | Straits of Sicily |
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