Ioannis
| Name | Ioannis |
| Type | Sailing vessel |
| GRT | 280 tons |
| Country |  Greek |
| Built | |
| Builder | |
| Operator | |
| History |
U-boat attacks on Sailing vessel Ioannis
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 9 Oct 1917 | Sunk | 100 miles SW of Crete |
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