Ottomar
| Name | Ottomar |
| Type | Sailing vessel |
| GRT | 327 tons |
| Country |  Russian |
| Built | 1903 |
| Builder | A. Haab, Pernau |
| Operator | Aug. Klein, Riga |
| History |
U-boat attacks on Sailing vessel Ottomar
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 Mar 1916 | U 44 (Paul Wagenführ) | Sunk | 40 to 45 miles SE of Fastnet | Churchtown, British Guyana - Liverpool | greenhart (a type of wood) |
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