Gelsina
| Name | Gelsina |
| Type | Navy Trawler |
| GRT | 227 tons |
| Country |  British |
| Built | 1916 |
| Builder | Cook, Welton & Gemmell, Ltd., Beverley |
| Operator | Royal Navy |
| History | Peace-time operator: Walter M. Olney, Grimsby |
U-boat attacks on Navy Trawler Gelsina
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 25 Jun 1917 | UC 40 (Gustav Deuerlich) | Sunk | Mined off Aberdeen | 57° 07'N, 1° 58'W | Admiralty service | 5 |
Position of attack on Gelsina
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