Gruno
| Name | Gruno |
| Type | Auxiliary motor |
| GRT | 171 tons |
| Country |  Dutch |
| Built | 1916 |
| Builder | Meusing, Hoogezand |
| Operator | Njord Scheepvaart Mij NV., Rotterdam |
| History |
U-boat attacks on Auxiliary motor Gruno
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 10 May 1917 | UC 63 (Karsten von Heydebreck) | Sunk | Stopped and sunk about 8 miles SSW of the Noord Hinder LV | Rotterdam - London | general cargo |
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