Sif
| Name | Sif |
| Type | Steamer |
| GRT | 3,282 tons |
| Country |  Norwegian |
| Built | 1902 |
| Builder | Ropner & Son, Stockton |
| Operator | A/S D/S Sif (Jacob R. Olsen), Bergen |
| History |
U-boat attacks on Steamer Sif
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Apr 1918 | UC 17 (Erich Stephan) | Damaged | Mined off Falmouth | Tyne - Gibraltar | coal |
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