Constance Mary
| Name | Constance Mary |
| Type | Sailing vessel |
| GRT | 177 tons |
| Country |  British |
| Built | 1875 |
| Builder | Simpson, Glasson Dock |
| Operator | Albert Wetcott, Plymouth |
| History | Wooden three-masted schooner. |
U-boat attacks on Sailing vessel Constance Mary
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 15 Dec 1916 | UC 17 (Ralph Wenninger) | Sunk | Stopped and scuttled 20 miles NE of Cape Barfleur | Caen - Swansea | iron ore | 0 |
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