Trelyon
| Name | Trelyon |
| Type | Steamer |
| GRT | 3,099 tons |
| Country |  British |
| Built | 1898 |
| Builder | J. Readhead & Sons, So. Shields |
| Operator | Hain SS. Co., Ltd. (E. Hain & Son), St. Ives |
| History |
U-boat attacks on Steamer Trelyon
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 Jul 1917 | UB 21 (Franz Walther) | Sunk | Mined 3 miles N Scarborough. Beached but a total loss. | 54.18N, 00.20W | Archangelsk - U.K. | timber | 0 |
| July 21 per British sources. | ||||||||
If you can help us with any additional information on this vessel then please contact us.