Certo
| Name | Certo |
| Type | Steamer |
| GRT | 1,629 tons |
| Country |  Norwegian |
| Built | 1910 |
| Builder | Short Bros., Ltd., Sunderland |
| Operator | D/S A/S Certo (B. Stolt-Nielsen), Haugesund |
| History |
U-boat attacks on Steamer Certo
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 May 1917 | UC 26 (Matthias Graf von Schmettow) | Sunk | 10 miles W Whistle Buoy Le Havre | Newcastle - Le Havre | coal | 0 |
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