Quatre Freres
| Name | Quatre Freres |
| Type | Fishing vessel |
| GRT | 53 tons |
| Country |  French |
| Built | 1908 |
| Builder | ?, Paimpol |
| Operator | Jwan Marie Adam, Groix |
| History |
U-boat attacks on Fishing vessel Quatre Freres
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 16 Sep 1917 | UC 31 (Kurt Siewert) | Sunk | Stopped and scuttled 240 miles from French Atlantic coast |
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