Leo
| Name | Leo |
| Type | Steamer |
| GRT | 2,224 tons |
| Country |  Russian |
| Built | 1903 |
| Builder | R. Craggs & Sons, Ltd., Middlesbrough |
| Operator | Finska Ångfartygs A/B, Helsingfors |
| History |
U-boat attacks on Steamer Leo
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 9 Jul 1915 | U 20 (Walther Schwieger) | Sunk | 48 miles SW of the Smalls | 51.07N, 07.10W | Philadelphia - Manchester | general cargo | 0 |
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