Marsouin
| Name | Marsouin |
| Type | Fishing vessel |
| GRT | 55 tons |
| Country |  French |
| Built | 1909 |
| Builder | Jean-Marie Guillaume du Palais, Belle Ile |
| Operator | Henri Calloch, Groix |
| History | Fishing registration: G 992 |
U-boat attacks on Fishing vessel Marsouin
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 6 Feb 1918 | U 53 (Hans Rose) | Sunk | Stopped and sunk by gunnery off Trevose Head | 50° 55'N, 4° 55'W | 0 |
Position of attack on Marsouin
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