Mercator
| Name | Mercator |
| Type | Steamer |
| GRT | 2,827 tons |
| Country |  Finnish |
| Built | 1891 |
| Builder | Irvine & Co., West Hartlepool |
| Operator | Helsingfors Rederi A/B, Helsingfors |
| History |
U-boat attacks on Steamer Mercator
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 13 Oct 1916 | UC 26 (Matthias Graf von Schmettow) | Sunk | Mined off Boulogne | 50.45N, 00.46W | Dunkerque - Bristol Channel | 0 |
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