Hiram
| Name | Hiram |
| Type | steamer |
| GRT | 598 tons |
| Country |  Norwegian |
| Built | 1890 |
| Builder | Nylands Værksted, Christiania |
| Operator | D/S A/S Hiram (N. Mjelde), Haugesund |
| History |
U-boat attacks on steamer Hiram
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 May 1917 | UC 21 (Reinhold Saltzwedel) | Sunk | 10 miles off Cap Vilano | Pomaron - Rouen | copper ore | 0 |
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