Rönnaug
| Name | Rönnaug |
| Type | Steamer |
| GRT | 1,331 tons |
| Country |  Norwegian |
| Built | 1883 |
| Builder | Burmeister & Wain, Copenhagen |
| Operator | Aktie D/S Ragni (Erling Lund), Christiania |
| History |
U-boat attacks on Steamer Rönnaug
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Oct 1916 | U 71 (Hugo Schmidt) | Sunk | 8-10 miles SE of Risör | 58.39N, 10.04E | Fredrikstad - London | lumber | 0 |
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