Efeu
| Name | Efeu |
| Type | Sailing vessel |
| GRT | 569 tons |
| Country |  Norwegian |
| Built | 1907 |
| Builder | Casco SB Co., Portland ME |
| Operator | A/S Efeu (H. T. Realfsen), Skien |
| History |
U-boat attacks on Sailing vessel Efeu
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Mar 1917 | UC 66 (Herbert Pustkuchen) | Sunk | 10 miles WSW of Dungeness | Falmouth – Porsgrund | in ballast | 0 |
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