Maria Luiza
| Name | Maria Luiza |
| Type | Sailing vessel |
| GRT | 148 tons |
| Country |  Portuguese |
| Built | 1899 |
| Builder | J. M. B. Monica, Aveiro |
| Operator | Parceria Martima Ilhavense, Aveiro |
| History | Wooden schooner. Built as Novo Social. |
U-boat attacks on Sailing vessel Maria Luiza
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 22 Aug 1918 | U 22 (Hinrich Hermann Hashagen) | Sunk | Stopped and scuttled off the Portugese coast | Oporto - Lisbon |
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