Maria S.
| Name | Maria S. |
| Type | Sailing vessel |
| GRT | 133 tons |
| Country |  Italian |
| Built | 1910 |
| Builder | Ambrogio Terrizzano, Oneglia |
| Operator | Alessandro Nardini, Viareggio |
| History | Wooden brigantine |
U-boat attacks on Sailing vessel Maria S.
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Apr 1917 | U 33 (Gustav Sieß) | Sunk | Stopped and sunk by gunnery off Civita Vecchia | 42° 09'N, 11° 01'E |
Position of attack on Maria S.
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