Otto
| Name | Otto |
| Type | Sailing vessel |
| GRT | 152 tons |
| Country |  Danish |
| Built | 1871 |
| Builder | J. Ring Andersen, Svendborg |
| Operator | J. Damkier Petersen, Kolding |
| History | Wooden brigantine. |
U-boat attacks on Sailing vessel Otto
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 May 1917 | UC 79 (Erich Haecker) | prize | Skagerrak | 0 | |||
| Taken as a prize and retained. | ||||||||
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