Rivière-du-Loup is a regional county municipality in the Bas-Saint-Laurent region of Quebec, Canada. Its most important city is Rivière-du-Loup, which contains more than half of the population.
Major industries include pulp and paper, other wood products, peat products, mineral products and textiles.
The name comes from the French, "River of the Wolf".
There are 13 subdivisions and one native reserve within the RCM:
Highways and numbered routes that run through the municipality, including external routes that start or finish at the county border: