Marthe
| Name | Marthe |
| Type | Sailing vessel |
| GRT | 154 tons |
| Country |  French |
| Built | 1905 |
| Builder | Collin Frères, Gravelines |
| Operator | Ambrosius Denoir, Dunkerque |
| History | Wooden schooner |
U-boat attacks on Sailing vessel Marthe
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 4 Feb 1917 | UC 46 (Friedrich Moecke) | Sunk | Stopped and sunk by gunnery 18 miles SSE of Scilly Isles | 49.42N, 06.00W | Lisbon - Dunkirk | salt | 0 |
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