Otto
| Name | Otto |
| Type | Sailing vessel |
| GRT | 139 tons |
| Country |  British |
| Built | 1910 |
| Builder | Pattje, Waterhiuzen |
| Operator | Admiralty requisition, London |
| History | Steel-hulled schooner. |
U-boat attacks on Sailing vessel Otto
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Jan 1918 | U 91 (Alfred von Glasenapp) | Sunk | Stopped and sunk by gunnery 10 miles SSW from St. John’s Point, Co. Down | 54.11N, 05.32W | Glasgow - Dundalk | coal | 0 |
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