Nus is a town and comune in the Aosta Valley region of northern Italy. It is located in the Alpine northwest of the country, within Italy's smallest region by area.
As a comune, Nus is one of the basic administrative units of the Aosta Valley, a region that is officially bilingual in Italian and French. The town lies in the valley of the Dora Baltea, the river that runs through the length of the Aosta Valley.