John Twohy
| Name | John Twohy |
| Type | Sailing vessel |
| GRT | 1,019 tons |
| Country |  American |
| Built | 1891 |
| Builder | George E. Currier, Newburyport, Mass. |
| Operator | A. D Cummins & Co., Philadelphia |
| History | Four-masted wooden schooner. |
U-boat attacks on Sailing vessel John Twohy
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 21 Jul 1917 | U 155 (Karl Meusel) | Sunk | Stopped and sunk 120 miles S of Ponta, Azores | Philadelphia - Algiers | sulphur | 0 |
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