| Fortier River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Centre-du-Québec |
| Subdivision Type4: | MRC |
| Subdivision Name4: | L'Érable Regional County Municipality |
| Length: | 8.8km (05.5miles) |
| Source1: | Forest and Mountain streams |
| Source1 Location: | Vianney |
| Source1 Coordinates: | 46.0726°N -71.5959°W |
| Source1 Elevation: | 430m (1,410feet) |
| Mouth: | Bécancour River (via William Lake) |
| Mouth Location: | Saint-Ferdinand |
| Mouth Coordinates: | 46.1358°N -71.5828°W |
| Mouth Elevation: | 193m (633feet) |
| Progression: | Bécancour River, St. Lawrence River |
| Tributaries Left: | (upstream) Ruisseau Larose, décharge du lac Tanguay |
| Tributaries Right: | (upstream) |
| Country: |  Canada |
The Fortier River (in French: rivière Fortier) is a tributary of the Bécancour River (via William Lake. It flows in the municipalities of Vianney and Saint-Ferdinand, in the L'Érable Regional County Municipality (MRC), in the administrative region of Centre-du-Québec, in Quebec, in Canada.
The main neighboring watersheds of the Fortier river are:
The Fortier River has its source in the mountains, at at south-west of a summit (elevation:, at west of hamlet "Le Cent-Ans" and south of William Lake.
From its source, the Fortier river flows over generally North, with a drop of, divided into the following segments:
The Fortier river empties on the south-est bank of the Bécancour River (via William Lake) at the end of a peninsula which located north of Langlois Bay. This confluence is located 3.3 km north-west of the downtown of Saint-Ferdinand.
The term "Fortier" turns out to be a family name of French origin.
The toponym "rivière Fortier" was made official on August 17, 1978, at the Commission de toponymie du Québec.[2]