Ioannis
| Name | Ioannis |
| Type | Steamer |
| GRT | 3,828 tons |
| Country |  Greek |
| Built | 1902 |
| Builder | W. Gray & Co., Ltd., West Hartlepool |
| Operator | C. Mazarakis (N. D. Lykiardopulo), Argostoli |
| History |
U-boat attacks on Steamer Ioannis
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 12 Nov 1916 | U 50 (Gerhard Berger) | Sunk | 150 miles N of Cape Finisterre or 130 miles N of Cape Ortegal | 45.30N, 07.20W | Bahia Blanca - London | wheat |
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