Midtsjö
| Name | Midtsjö |
| Type | Sailing vessel |
| GRT | 185 tons |
| Country |  Norwegian |
| Built | 1845 |
| Builder | unknown yard in Dieppe |
| Operator | Solgt til Skibs-A/S Midtsjø (R. Jacobsen & T. Waalman), Kristiania |
| History |
U-boat attacks on Sailing vessel Midtsjö
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 Jun 1918 | U 80 (Karl Koopmann) | Sunk | about 15 miles S of Songvaar Light | Kristiania – Hartlepool | pitprops | 0 |
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