Us (French pronunciation: [ys] ⓘ) is a commune in the Val-d'Oise department and Île-de-France region of France.

The village lies in a rural setting in the valley of the River Viosne, some 40 km north-west of Paris, within the Vexin Regional Nature Park.

The commune is bordered by those of Ableiges, Marines, Santeuil, and Vigny.

The nearest shopping centre is at Marines.

Us has a railway station on the line from Gisors to Pontoise and Paris (Gare Saint-Lazare).