Leo
| Name | Leo |
| Type | Sailing vessel |
| GRT | 269 tons |
| Country |  Russian |
| Built | 1899 |
| Builder | J. Sotka, Lokalax |
| Operator | J. A. Malen, Nystad |
| History | Also given as Leo Usikanpunski. |
U-boat attacks on Sailing vessel Leo
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Jun 1915 | U 38 (Max Valentiner) | Sunk | Position given as 58°55’N, 01°13’W per KTB | 59.05N, 00.36W | Moss - Canada | in ballast |
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