Borgsten
| Name | Borgsten |
| Type | Steamer |
| GRT | 1,718 tons |
| Country |  Norwegian |
| Built | 1913 |
| Builder | Nylands Verksted, Christiania |
| Operator | A/S Borgå (Petter Olsen), Christiania |
| History |
U-boat attacks on Steamer Borgsten
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 19 Dec 1917 | UC 64 (Erich Hecht) | Sunk | Torpedoed 30 miles S1/2W of Barfleur | Rouen - Newport, Mon. | in ballast | 0 |
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