Grönhaug
| Name | Grönhaug |
| Type | steamer |
| GRT | 667 tons |
| Country |  Norwegian |
| Built | 1890 |
| Builder | Burmeister & Wain, Copenhagen |
| Operator | D/S A/S Haug (L. Mæland), Haugesund |
| History |
U-boat attacks on steamer Grönhaug
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Oct 1916 | UB 21 (Ernst Hashagen) | Sunk | 55° 39'N, 0° 57'E | Göteborg - Hull | timber and steel products | 0 |
Position of attack on Grönhaug
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