Castor I
| Name | Castor I |
| Type | Sailing vessel |
| GRT | 117 tons |
| Country |  Norwegian |
| Built | 1903 |
| Builder | Søren Olsen Arnevig, Strømsund i Flosta |
| Operator | A/S Castor (Gustav Pedersen & Søn), Mandal |
| History |
U-boat attacks on Sailing vessel Castor I
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 29 Jun 1918 | U 107 (Kurt Slevogt) | Sunk | 30 miles W of Ragefjord | Arendal – Tyne | pitprops | 0 |
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