The lac de la Belle Rivière is a freshwater body at the head of Belle Rivière on the watershed of lac Saint-Jean, in the unorganized territory of Belle-Rivière, in the Lac-Saint-Jean-Est Regional County Municipality, in the region Saguenay–Lac-Saint-Jean, in the province of Quebec, in Canada.

Lake Belle Rivière is located in the northwestern part of the Laurentides Wildlife Reserve.

A few secondary roads serve this area for the needs of forestry, recreational tourism activities.

The surface of Belle Rivière Lake is usually frozen from the beginning of December to the end of March, however the safe circulation on the ice is generally from mid-December to mid-March.

The mouth of this lake is located to the west, at the Laurentian Highway bridge, at: From the mouth of Belle Rivière lake, the current follows the course of the Belle Rivière consecutively on 33.8 km (21.0 mi) northwesterly to the east shore of Lac Saint-Jean; from there, the current goes north on 15.4 km (9.6 mi) crossing this last lake, follows the course of the Saguenay river via the Petite Décharge on 172.3 km (107.1 mi) until Tadoussac where it merges with the Saint Lawrence estuary.