San Guglielmo
| Name | San Guglielmo |
| Type | Passenger steamer |
| GRT | 8,145 tons |
| Country |  Italian |
| Built | 1911 |
| Builder | D. & W. Henderson & Co., Ltd., Glasgow |
| Operator | “Transoceanica” Soc. Italiana di Navigazione, Naples |
| History |
U-boat attacks on Passenger steamer San Guglielmo
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 8 Jan 1918 | U 63 (Kurt Hartwig) | Sunk | near Loano, Gulf of Genoa | 44.07N, 08.18E | Genoa - Gibraltar |
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