Nomans River is a tributary of the Unknown River in Regional County Municipality (RCM) of Eeyou Istchee James Bay (municipality) in the administrative region of the Nord-du-Québec, Canadian province of Quebec, in Canada.

The course of Nomans river crosses the townships of Montviel and Monseignat.

The Nomans River hydrographic slope is served by the R1018 (north-south) secondary road from Matagami, which spans the Maicasagi River at 4.2 kilometres (2.6 mi) from its mouth.

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 latter is crossed to the Northwest by the Waswanipi River which is a tributary of Matagami Lake.