Idaho
| Name | Idaho |
| Type | Steamer |
| GRT | 3,023 tons |
| Country |  British |
| Built | 1899 |
| Builder | W. Gray & Co., Ltd., West Hartlepool |
| Operator | The Shipping Controller (H. Samman & Co.), London |
| History |
U-boat attacks on Steamer Idaho
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 18 Aug 1918 | U 107 (Kurt Siewert) | Sunk | 120 miles NxW1/2W of Cape Villano. 45.47N, 10.44W per KTB. | 44.40N, 10.20W | Clyde - ? | in ballast | 11 |
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