Grenmar
| Name | Grenmar |
| Type | Steamer |
| GRT | 1,438 tons |
| Country |  Norwegian |
| Built | 1884 |
| Builder | Palmers’ SB. & Iron Co., Ltd., Newcastle |
| Operator | A/S Harald Grenske (H. Haraldsen), Skien |
| History |
U-boat attacks on Steamer Grenmar
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 Mar 1917 | UC 77 (Reinhard von Rabenau) | Sunk | 34 miles NxE1/2E of St. Abb’s head | Blyth - Christiania | coal | 0 |
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