Elfi
| Name | Elfi |
| Type | Steamer |
| GRT | 1,120 tons |
| Country |  Norwegian |
| Built | 1908 |
| Builder | Rotterdam Droogdok Mij., Rotterdam |
| Operator | A/S Thor O. Hannevigs D/S (T. O. Hannevig & Co.), Christiania |
| History | Built for N.V. Mij. ss. Johanna (J. de Poorter), Rotterdam as Johanna. Sold in 1915 to Hannevig Bros., Christiania and renamed Elfi with another slight ownership change the next year. |
U-boat attacks on Steamer Elfi
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 3 Mar 1917 | UC 41 (Kurt Bernis) | Damaged | Mined 7 miles S of St. Abbs Head. | 55.51N, 01.57W | Bergen - London | timber | |
| 2 | 7 Feb 1918 | UC 17 (Erich Stephan) | Sunk | Torpedoed about 3 miles SE of Sunderland | Jarrow - Rouen | coal | 6 | |
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