| Muy | |
| Map: | Nottaway map.png |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Nord-du-Québec |
| Length: | 30.5km (19miles)[1] |
| Source1: | Forested creek |
| Source1 Location: | Eeyou Istchee Baie-James (municipalité), Nord-du-Québec, Quebec |
| Source1 Coordinates: | 47.2969°N -75.9175°W |
| Source1 Elevation: | 412m (1,352feet) |
| Mouth: | Wetetnagami River |
| Mouth Location: | Eeyou Istchee Baie-James (municipalité), Nord-du-Québec, Quebec |
| Mouth Coordinates: | 49.1722°N -76.0706°W |
| Mouth Elevation: | 353m (1,158feet) |
| Tributaries Left: | Discharge of Labrecque Lake |
The Muy River is a tributary of the east bank of the Wetetnagami River flowing into the Regional County Municipality (RCM) of Eeyou Istchee James Bay, in the administrative region of Nord-du-Québec, Quebec, Canada.
This river crosses successively (from the upstream) the townships of Prévert, Muy and Effiat.
Forestry is the main economic activity of the sector; recreational tourism activities, second.
The Muy River Valley is served by R1015 Forest Road (North-South) passing west of the Wetetnagami River Valley; this road joins the road R1051 towards the North (East-West direction). Route R1053 (East-West) intersects the lower part of the Muy River.
The surface of the Muy River is usually frozen from early November to mid-May, however, safe ice movement is generally from mid-November to mid-April.
At various times in history, this territory has been occupied by the Attikameks, the Algonquin and the Cree. The term "Muy" is a family name of French origin.
The toponym "rivière Muy" was officialized on December 5, 1968, at the Commission de toponymie du Québec, when it was created.[2]