Giuseppe O.
| Name | Giuseppe O. |
| Type | Sailing vessel |
| GRT | 74 tons |
| Country |  Italian |
| Built | 1905 |
| Builder | Francesco Gori, Viareggio |
| Operator | Bardo Marchetti, Viareggio |
| History | Former name Giovanni Morelli |
U-boat attacks on Sailing vessel Giuseppe O.
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 Jan 1918 | U 65 (Hermann von Fischel) | Sunk | Stopped and sunk E of Corsica |
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