Ydun
Photo courtesy of Danish Maritime Museum, Elsinore
| Name | Ydun |
| Type | Passenger steamer |
| GRT | 645 tons |
| Country |  Danish |
| Built | 1910 |
| Builder | Helsingørs Jernskibsvft. & Maskinbyg., Helsingør |
| Operator | Det Forenede Dampskibs Selsk., Copenhagen / Horsens |
| History |
U-boat attacks on Passenger steamer Ydun
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 23 Apr 1917 | UC 79 (Erich Haecker) | prize | Skagerrak | ||||
| Taken as a prize, later released | ||||||||
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