Vitz-sur-Authie is a commune in the Somme department in Hauts-de-France in northern France.

The commune is situated 16 miles (26 km) northeast of Abbeville, on the D121 road and on the border with the Pas-de-Calais department.

Also known as Vitz-lès-Willancourt, the commune was once the seigneurie of the d'Abbeville family.

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