Roberval is a city on the south-western shore of Lac Saint-Jean in the Le Domaine-du-Roy Regional County Municipality of Quebec, Canada. With a population of 9,840 in the Canada 2021 Census, it is the fourth largest city on this lake after Alma, Dolbeau-Mistassini and Saint-Félicien. It is the seat of the Domaine-du-Roy RCM and the main service centre for the region with a hospital and some government services. It is also the seat of the judicial district of Roberval.

Lac Saint-Jean is a large, relatively shallow lake in south-central Quebec, Canada, in the Laurentian Highlands. It is situated 206 km (128 mi) north of the Saint Lawrence River, into which it drains via the Saguenay River. It covers an area of 1,053 km2 (407 sq mi), and is 63.1 m (207 ft) at its deepest point. Its name in the Innu language is Piekuakamu.