The Aosta Valley is a mountainous autonomous region in north-western Italy. It is bordered by France to the west, Switzerland to the north and the region of Piedmont to the south and east.

With an area of 3,263 km² and a population of about 120,000, it is the smallest, least populous, and least densely populated region of Italy. It is the only Italian region which has no provinces (the province of Valle d'Aosta was dissolved in 1945). Provincial administrative functions are provided by the regional government. The region is divided into 74 comuni (communes).

Some communes, concentrated in the valley bottomlands, speak a form of Gallo-Romance as their first language, while in the Lys Valley there is a Walser Germanic speaking minority. The regional capital is Aosta.