Neptunus I
| Name | Neptunus I |
| Type | Trawler |
| GRT | 80 tons |
| Country |  Dutch |
| Built | 1902 |
| Builder | |
| Operator | N.V. Rederij Neptunus, (F. Vrolijk, Scheveningen) Delfzijl |
| History | Registration: SCH 479. Built as Maria Clasina. |
U-boat attacks on Trawler Neptunus I
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 28 Jul 1917 | UC 16 (Georg Reimarus) | Sunk | Stopped and sunk by gunnery off Ymuiden | 0 |
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