Thomasina
| Name | Thomasina |
| Type | Sailing vessel |
| GRT | 1,869 tons |
| Country |  Russian |
| Built | 1873 |
| Builder | A. MacMillan & Son, Dumbarton |
| Operator | August Troberg, Mariehamn, & M. Lundqvist, Vårdö |
| History |
U-boat attacks on Sailing vessel Thomasina
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 10 Jun 1915 | U 35 (Waldemar Kophamel) | Sunk | 49 miles SSE of Roche’s Point | Liverpool - Pensacola | in ballast |
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