Silius
| Name | Silius |
| Type | Sailing vessel |
| GRT | 1,559 tons |
| Country |  Norwegian |
| Built | 1895 |
| Builder | Ateliers & Chantiers de la Loire, Saint Nazaire |
| Operator | Solgt til A/S Excelsior (S. O. Stray & Co.), Kristiansand |
| History | Steel-hulled bark. Built as Colbert. |
U-boat attacks on Sailing vessel Silius
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 9 Mar 1916 | UB 18 (Otto Steinbrinck) | Sunk | Torpedoed in Le Havre Roads | New York - Le Havre | barley | 3 |
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