Martignas-sur-Jalle (French pronunciation: [maʁtiɲas syʁ ʒal]; Occitan: Martinhàs de Jalas) is a commune in the Gironde department, Nouvelle-Aquitaine, southwestern France.

Historically, the town is known to have been the theater of the Battle of Martignas [fr], where 500 to 600 longbowmen commanded by John Talbot were slaughtered by the French cavalry commanded by the Duke of Bourbon and the Count of Foix.

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