Thorsa
| Name | Thorsa |
| Type | Steamer |
| GRT | 1,319 tons |
| Country |  British |
| Built | 1884 |
| Builder | Barclay, Curle & Co., Glasgow |
| Operator | Leith, Hull & Hamburg Steam Packet Co., Ltd. (J. Currie & Co.), Leith |
| History |
U-boat attacks on Steamer Thorsa
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 2 May 1918 | UB 103 (Paul Hundius) | Sunk | Torpedoed 3 miles NNW Pendeen LH | 50.12N, 05.44W | Le Havre - Liverpool | general cargo | 0 |
| 0.25am | ||||||||
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