| Rivière des Frères | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Centre-du-Québec |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Nicolet-Yamaska Regional County Municipality |
| Subdivision Type5: | Municipality |
| Subdivision Name5: | Baie-du-Febvre |
| Length: | 4km (02miles) |
| Source1: | Agricultural streams |
| Source1 Location: | Baie-du-Febvre |
| Source1 Coordinates: | 46.1065°N -72.701°W |
| Source1 Elevation: | 41m (135feet) |
| Mouth: | Lake Saint-Pierre, St. Lawrence River |
| Mouth Location: | Baie-du-Febvre |
| Mouth Coordinates: | 46.1661°N -72.7319°W |
| Mouth Elevation: | 6m (20feet) |
| Tributaries Left: | (upstream) |
| Tributaries Right: | (upstream) |
| Country: |  Canada |
The rivière des Frères (in English: Brothers river) is a tributary on the south shore of lake Saint-Pierre which is crossed to the northeast by the St. Lawrence River. The rivière des Frères flows in the municipality of Baie-du-Febvre, in the Nicolet-Yamaska Regional County Municipality (MRC), in the administrative region of Centre-du-Québec, in Québec, in Canada.
The main hydrographic slopes near the Rivière des Frères are:
The "rivière des Frères" draws its source from agricultural streams located in the territory of the municipality of Baie-du-Febvre, southeast of the village, northeast of route 255, between chemin du Pays Brûlé and rang de la Grande Plaine.
The "rivière des Frères" flows on towards the north-west in an agricultural zone, passing north-east of the village of Baie-du-Febvre, and crosses the route 132. At the end of the course, the river crosses the firing range of the Ministry of National Defense.[1]
The "rivière des Frères" flows over the "Battures des Frères" on the south shore of Lake Saint-Pierre, downstream from "La Longue Pointe", north-west of the village of Baie-du-Febvre. The confluence of the "rivière des Frères" is located southwest of the confluence of the Brielle river.
The toponym "rivière des Frères" was made official on August 28, 1980, at the Commission de toponymie du Québec.[2]