The Rivière des Monts (English: River of the Mounts) is a tributary of the southwest bank of the lower part of the watercourse Le Gros Bras, flowing in the non organized from Lac-Pikauba and the municipality of Saint-Urbain, in the Charlevoix Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.

The water level of the river varies with the seasons and the precipitation; the spring flood generally occurs in April.

This source of the river is located at: From its source, the course of the Monts river descends on 8.6 kilometres (5.3 mi) in a generally deep valley, with a drop of 467 metres (1,532 ft), according to the following segments: The Rivière des Monts flows on the southwest bank of the Le Gros Bras stream, in the municipality of Saint-Urbain.

This mouth is located at: From the mouth of the Monts river, the current descends on 9.5 kilometres (5.9 mi) following the course of Le Gros Bras towards the south- East; then on 25.3 kilometres (15.7 mi) with a drop of 56 metres (184 ft) following the course of the rivière du Gouffre which flows into Baie-Saint-Paul in the St. Lawrence River.

The toponym “Rivière des Monts” was formalized on March 25, 1997 at the Place Names Bank of the Commission de toponymie du Québec.