Martha
Photo courtesy of Danish Maritime Museum, Elsinore
| Name | Martha |
| Type | Sailing ship |
| GRT | 412 tons |
| Country |  Danish |
| Built | 1892 |
| Builder | Schömer, Jensen & Co., Tönning |
| Operator | A.M. Knudsen, Sønderho |
| History | Steel-hulled bark. |
U-boat attacks on Sailing ship Martha
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 19 Oct 1917 | UB 66 (Fritz Wernicke) | Sunk | Sunk by gunfire. | 61.12N, 02.10W | Kingston, Jamacia - Aarhus | maize | 10 |
| Vessel posted as missing; crew not recovered from lifeboats. | ||||||||
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