Ada
| Name | Ada |
| Type | Sailing vessel |
| GRT | 187 tons |
| Country |  British |
| Built | 1872 |
| Builder | D. Egan, Mount Stewart, Prince Edward Island |
| Operator | John H. Hannan and Sidney J. Samuel, Faversham |
| History | Wooden brigantine. |
U-boat attacks on Sailing vessel Ada
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 11 Feb 1917 | UC 66 (Herbert Pustkuchen) | Sunk | Stopped and sunk by gunnery 8 miles S of Anvil Point | London - Landerneau | manure | 0 |
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