The Rivière aux Outardes or Outardes River is a river in Quebec, Canada. The river originates in the Otish Mountains, and flows in a southerly direction for its entire course. It passes through Lake Plétipi and Burnt Islands Lake (Îles Brûlées), and widens about midway to form the large Outardes 4 Reservoir. It drains into Outardes Bay of the Saint Lawrence River, about southwest of Baie-Comeau.