The Blondeau River is a tributary of the Fraser River, flowing into the municipalities of Belleterre and Latulipe-et-Gaboury, into the Témiscamingue Regional County Municipality (RCM), in the administrative region of Abitibi-Témiscamingue, in Quebec, Canada.

The Blondeau River flows entirely in forest territory.

Annually, the surface of the river is usually frozen from mid-November to mid-April, however safe ice circulation is generally from mid-December to late March.

The Blondeau River rises at the mouth of Lake Blondeau (length: 1.7 kilometres (1.1 mi), altitude: 321 metres (1,053 ft)) in the municipality of Belleterre.

[3] This confluence of the Marécaguese River is located at: The term "Blondeau" is a family name of French origin.