Castor
| Name | Castor |
| Type | Trawler |
| GRT | 182 tons |
| Country |  British |
| Built | 1900 |
| Builder | Mackie & Thomson, Glasgow |
| Operator | Grimsby & North Sea Fishing Co. Ltd., Grimsby |
| History |
U-boat attacks on Trawler Castor
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 9 Jun 1915 | U 25 (Otto Wünsche) | Sunk | Stopped and sunk 80 miles NExN of Spurn | 0 |
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