Ioanna
| Name | Ioanna |
| Type | Steamer |
| GRT | 3,459 tons |
| Country |  British |
| Built | 1906 |
| Builder | W. Gray & Co., Ltd., West Hartlepool |
| Operator | Joanna Shipping Co., Ltd. (Mango & Co.), London |
| History |
U-boat attacks on Steamer Ioanna
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 10 Sep 1917 | UC 77 (Reinhard von Rabenau) | Damaged | Torpedoed 1.5 miles off Longships | Havre - Manchester | in ballast | 0 |
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