Iolo
| Name | Iolo |
| Type | Steamer |
| GRT | 3,903 tons |
| Country |  British |
| Built | 1898 |
| Builder | Ropner & Son, Stockton (E. Thomas, Radcliffe & Co.), Cardiff |
| Operator | Iolo Morganwg SS. Co., Ltd. |
| History |
U-boat attacks on Steamer Iolo
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 11 Oct 1916 | U 46 (Leo Hillebrand) | Sunk | 153 miles N of Vardo, Norway | 72° 50'N, 32° 00'E | Cardiff – Arkhangelsk | coal | 0 |
Position of attack on Iolo
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