Seirstad
| Name | Seirstad |
| Type | Steamer |
| GRT | 995 tons |
| Country |  Norwegian |
| Built | 1899 |
| Builder | Nylands Verksted, Christiania |
| Operator | Jac. Prebensen, Jr., Risør |
| History |
U-boat attacks on Steamer Seirstad
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 11 Nov 1916 | UC 17 (Ralph Wenninger) | Sunk | 10 miles S of the Longships LV | 49° 57'N, 5° 38'W | Newport, Mon. - Tonnay Charente | coal | 0 |
Position of attack on Seirstad
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