Mercurius
| Name | Mercurius |
| Type | Fishing vessel (sail) |
| GRT | 80 tons |
| Country |  Dutch |
| Built | 1916 |
| Builder | Joost Pot , Vlaardingen. |
| Operator | P. Doelman, Maasluis |
| History | Registration: MA 45 |
U-boat attacks on Fishing vessel (sail) Mercurius
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 17 May 1917 | UC 71 (Hugo Thielmann) | Sunk | Stopped and scuttled 17 miles NW of Noordwijk | 0 |
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