The Attert (French pronunciation: [atɛʁt], German pronunciation: [ˈatɐt]; Luxembourgish: Atert) is a river flowing through Belgium and Luxembourg, left tributary of the Alzette.

Its source is in Nobressart, north-west of Arlon, in the Belgian province Luxembourg.

It flows through the village of Attert in Belgium, and the towns of Redange, Everlange, Useldange, Boevange-sur-Attert, and Bissen in Luxembourg.

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