| Gagné River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Chaudière-Appalaches |
| Subdivision Type4: | MRC |
| Subdivision Name4: | Les Appalaches Regional County Municipality |
| Length: | 6.5km (04miles) |
| Source1: | Forested streams |
| Source1 Location: | Thetford Mines |
| Source1 Coordinates: | 46.1586°N -71.3101°W |
| Source1 Elevation: | 450m (1,480feet) |
| Mouth: | Osgood River |
| Mouth Location: | Thetford Mines |
| Mouth Coordinates: | 46.1917°N -71.3261°W |
| Mouth Elevation: | 359m (1,178feet) |
| Progression: | Palmer River, Bécancour River, St. Lawrence River |
| Tributaries Left: | (upstream) |
| Tributaries Right: | (upstream) |
| Country: |  Canada |
The Gagné River (in French: rivière Gagné) is a tributary of the Osgood River, whose current flows successively into the Palmer River and Bécancour River; the latter being in turn a tributary of the south shore of the St. Lawrence River.
The Gagné river flows through the municipalities of Thetford Mines and Kinnear's Mills, in Les Appalaches Regional County Municipality, in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.
The main neighboring watersheds of the Gagné River are:
The Gagné river has its source in the heart of the village of Pontbriand, in Thetford Mines.
From its source, the Gagné River flows on towards the northwest until its confluence.[1]
The Gagné river flows at the confluence of the Osgood River with the Prévost brook in the municipality of Kinnear's Mills, in the heart of the hamlet of Plage-Lemieux.[2] Its confluence is located upstream of the municipal border between Kinnear's Mills and Thetford Mines.
The toponym "rivière Gagné" was made official on October 6, 1983, at the Commission de toponymie du Québec.[3]