Halcyon
| Name | Halcyon |
| Type | Trawler |
| GRT | 190 tons |
| Country |  British |
| Built | 1898 |
| Builder | Cochrane & Cooper, Ltd., Beverley |
| Operator | J. Leyman Jr, Hull |
| History | Still carried a Grimsby fishing registration despite her last owner being from Hull. |
U-boat attacks on Trawler Halcyon
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 19 Feb 1917 | U 71 (Hugo Schmidt) | Sunk | Mined off Butt of Lewis | 10 |
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