Mary Seymour
| Name | Mary Seymour |
| Type | Sailing vessel
|
| GRT | 150 tons |
| Country |  British |
| Built | 1865
|
| Builder | Tredwen, Padstow
|
| Operator | B. M. Harvey, Plymouth
|
| History | Wooden schooner.
|
U-boat attacks on Sailing vessel Mary Seymour
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties |
| 1 | 10 Sep 1917 | UC 51 (Hans Galster) | Sunk | Stopped and sunk 7 miles NNE of the Pendeen LH at 11:30am
| 50° 16'N, 5° 39'W
| Ellesmere Port - Cherbourg
| coal
| 0
|
Position of attack on Mary Seymour
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