Janna
| Name | Janna |
| Type | Sailing vessel |
| GRT | 145 tons |
| Country |  Dutch |
| Built | 1909 |
| Builder | R. T. Roorda, Drachten |
| Operator | J. M. Schuur, Groningen |
| History |
U-boat attacks on Sailing vessel Janna
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 Jul 1917 | UB 18 (Ulrich Meier) | Sunk | Stopped and sunk 20 miles off the Nieuwe Waterweg | Rotterdam - Le Havre | general cargo | ||
| Vessel soon salvaged, and returned to service. | ||||||||
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