Madeleine Iii
| Name | Madeleine Iii |
| Type | Q-ship |
| GRT | 149 tons |
| Country |  French |
| Built | 1898 |
| Builder | Massé & Chantelot, Fécamp |
| Operator | French Navy |
| History | Sailing vessel fitted with an auxiliary motor. Peace-time operator: J. Martin, Fécamp as Madeleine. |
U-boat attacks on Q-ship Madeleine Iii
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 8 May 1917 | U 47 (Heinrich Metzger) | Damaged | Damaged by shellfire 20 miles NE of Cap Bougaroni | 2 | |||
| 2 | 17 Aug 1917 | UC 67 (Karl Neumann) | Damaged | Hit by a single shell during a Q-ship engagement 40 miles W of Capo Granitola | 37.28N, 11.22E | 0 | ||
| 3 | 6 Apr 1918 | UB 50 (Franz Becker) | Sunk | Torpedoed between Bizerte and Bona (Algeria) | 37.27N, 09.53E | 17 | ||
| The three survivors were taken prisoner aboard UB 50. | ||||||||
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