Cassio
| Name | Cassio |
| Type | Trawler |
| GRT | 172 tons |
| Country |  British |
| Built | 1906 |
| Builder | Mackie & Thomson, Govan |
| Operator | Hellyer’s Steam Trawling Co. Ltd., Hull |
| History |
U-boat attacks on Trawler Cassio
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 24 Jul 1915 | U 36 (Ernst Graeff) | Sunk | Stopped and sunk 60 miles NxW of Hoy | 0 | |||
| Location also given as 123 miles NWxW of Hoy Head. | ||||||||
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