Thirlby
| Name | Thirlby |
| Type | Steamer |
| GRT | 2,009 tons |
| Country |  British |
| Built | 1898 |
| Builder | Ropner & Son, Stockton |
| Operator | Sir R. Ropner & Co., Ltd., West Hartlepool |
| History |
U-boat attacks on Steamer Thirlby
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 Jul 1917 | UC 31 (Otto von Schrader) | Sunk | 122 miles NWxW1/4W ofFastnet | 51.39N, 12.52W | Sevilla - Garston | copper and copper ore | 2 |
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