Oulx (Italian pronunciation: [ulks], French pronunciation: [u], Occitan: Ors) is a comune (municipality) in the Metropolitan City of Turin in the Italian region Piedmont, located about 70 kilometres (43 mi) west of Turin, in the Susa Valley on the border with France.

Like many other towns in the Susa Valley, Oulx has different names reflecting the area's multiple linguistic traditions.

[3] Another theory holds that the derivation is from Ultor, a title of the god Mars, to whom a temple in the area was dedicated.

In addition to Oulx proper, the municipality includes the frazioni (districts) of Amazas (local Occitan: Zamazá), Auberges (Oouberja), Beaulard (Bioulâ), Beaume (Baoumë), Chateau-Beaulard (Chaté), Clots (Clos), Constans (Coutan), Gad (Ga), Monfol (Mounfol), Pierremenaud (Piarmenaou), Puy (Peui), Royeres (Rouliera), San Marco (Sa' Mar), Savoulx (Savou), Signols (Signoou), Soubras (Ël Soubrâ), Vazon (Lou Vazoun), and Villard (Viarâ).

Oulx was the birthplace of Luigi (Louis) Des Ambrois (1807–74), an Italian unification-era politician and jurist, who served as chairman of the Senate of the Kingdom (Senato del Regno) shortly before his death.