Othonna
| Name | Othonna |
| Type | Navy Trawler |
| GRT | 180 tons |
| Country |  British |
| Built | 1899 |
| Builder | J. Duthie, Sons & Co., Aberdeen |
| Operator | Royal Navy |
| History | Pecae-time operator: Rainbow Steam Fishing Co. Ltd., Milford |
U-boat attacks on Navy Trawler Othonna
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 Apr 1917 | UC 41 (Kurt Bernis) | Sunk | Mined off Fife Ness | 56° 17'N, 2° 27'W | 9 |
Position of attack on Othonna
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