Neptunus
| Name | Neptunus |
| Type | Sailing vessel |
| GRT | 209 tons |
| Country |  Dutch |
| Built | 1911 |
| Builder | Th. Wilmink, Groningen |
| Operator | L. van der Veen, Groningen |
| History | Built as Zwanntina. |
U-boat attacks on Sailing vessel Neptunus
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 12 Apr 1917 | UC 31 (Otto von Schrader) | Sunk | Stopped and scuttled 20 miles ENE of Hartlepool | West Hartlepool - Christiania | coal |
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