Mary Ann
| Name | Mary Ann |
| Type | Fishing vessel |
| GRT | 17 tons |
| Country |  British |
| Built | |
| Builder | |
| Operator | Matthew Stevens, St. Ives |
| History | Fishing registration: SS 495 |
U-boat attacks on Fishing vessel Mary Ann
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 8 Feb 1917 | UC 65 (Otto Steinbrinck) | Sunk | Stopped and scuttled 18 miles NNE of St. Ives Head | 50° 50'N, 4° 57'W | |||
| or 5030N 0529W | ||||||||
Position of attack on Mary Ann
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