Saint-Christophe is a town and comune in the Aosta Valley region of northern Italy. It lies east of the city of Aosta, the regional capital, on the left shore of the Dora Baltea river.
The comune sits in the central part of the Aosta Valley, the small bilingual Italian-French region in the Alps. Its position along the Dora Baltea places it within the main valley floor, close to Aosta and the surrounding settlements that line the river.