Sylfiden
| Name | Sylfiden |
| Type | Sailing vessel |
| GRT | 796 tons |
| Country |  Norwegian |
| Built | 1877 |
| Builder | A. Stephen & Sons, Glasgow |
| Operator | Skibs-A/S Sylfiden (Bertrand Jacobsen), Arendal |
| History |
U-boat attacks on Sailing vessel Sylfiden
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 11 Apr 1917 | U 30 (Franz Grünert) | Sunk | about 50 miles NxW of Holmengraa | Buenos Aires – Flekkefjord via Stornoway | quebracho | 0 |
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