Neptunus
| Name | Neptunus |
| Type | Sailing vessel |
| GRT | 143 tons |
| Country |  Danish |
| Built | 1876 |
| Builder | R.V. Møller, Troense |
| Operator | C. V. Petersen, Svendborg |
| History |
U-boat attacks on Sailing vessel Neptunus
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 26 Jul 1915 | U 6 (Reinhold Lepsius) | Sunk | 56.59N, 02.05E | Kristania - Leith | planed boards | 0 |
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