The Iroquois River is a tributary of the Nottaway, in the administrative region of Nord-du-Québec, in the Canadian province of Quebec, in Canada.

The surface of the river is usually frozen from early November to mid-May, however, safe ice circulation is generally from mid-November to mid-April.

The main neighboring hydrographic slopes are: The "Iroquois River" originates at the mouth of Lake Esther (length: 5.1 kilometres (3.2 mi); width: 3.6 kilometres (2.2 mi); altitude: 244 metres (801 ft)).

This confluence is located at: According to the Atlas of Canada, the term "Iroquois" is used in 53 site designations.

The toponym "Rivière des Iroquois" (or Iroquois River, in English) was formalized on December 5, 1968, at the Commission de toponymie du Québec, at the creation of this commission[3] Download coordinates as: