The Bachelor River is a tributary of Lake Waswanipi, flowing into the Regional County Municipality (RCM) of Eeyou Istchee Baie-James, within the administrative region of Nord-du-Québec, in the province of Quebec, in Canada.

The hydrographic slope of the Bachelor River is accessible via route 113 which links Lebel-sur-Quévillon to Chibougamau.

In addition, the Canadian National Railway serves this small valley.

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

The Bachelor River originates at the mouth of Billy Lake (length: 2.9 kilometres (1.8 mi) altitude: 299 metres (981 ft)) which is located on the southeastern side of the route 113 to: From its source, the "Bachelor River" flows on 36.5 kilometres (22.7 mi) according to the following segments: The Bachelor River flows into a narrow bay on the Southeast shore of Lake Waswanipi; this mouth is located nearby (North side) of the Canadian National Railway track.