Mayfly
| Name | Mayfly |
| Type | Trawler |
| GRT | 199 tons |
| Country |  British |
| Built | 1899 |
| Builder | Cook, Welton & Gemmell, Hull |
| Operator | H. Smethurst, Grimsby |
| History |
U-boat attacks on Trawler Mayfly
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 Apr 1917 | UC 50 (Rudolf Seuffer) | Sunk | Shelled and sunk 75 miles NExE of Scarborough | 3 | |||
| Location also given as 70 miles NExN from the Spurn LV. | ||||||||
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