| Portneuf River | |
| Pushpin Map: | Quebec |
| Subdivision Type1: | Country |
| Subdivision Name1: | Canada |
| Subdivision Type2: | Province |
| Subdivision Name2: | Quebec |
| Subdivision Type3: | Region |
| Subdivision Name3: | Capitale-Nationale, Mauricie |
| Subdivision Type4: | Regional County Municipality |
| Subdivision Name4: | Portneuf Regional County Municipality |
| Subdivision Type5: | Municipalities |
| Subdivision Name5: | Pont-Rouge, Saint-Basile |
| Length: | 55km (34miles) |
| Source1: | Sept Îles Lake (Saint-Raymond) |
| Source1 Location: | Saint-Raymond, MRC Portneuf Regional County Municipality, Capitale-Nationale, Quebec, Canada |
| Source1 Coordinates: | 46.9339°N -71.7467°W |
| Source1 Elevation: | 209m (686feet) |
| Mouth: | Saint Lawrence river |
| Mouth Location: | Portneuf |
| Mouth Coordinates: | 46.9339°N -71.8067°W |
| Mouth Elevation: | 5m (16feet) |
The Rivière Portneuf is a tributary of the north shore of the Saint-Laurent river, crossing the municipalities of Saint-Raymond, Pont-Rouge, Sant-Basile and Portneuf, in the Portneuf Regional County Municipality, in the administrative region of the Capitale-Nationale, in the province of Quebec, in Canada.
The name of this river is linked to the seigniory of Portneuf which it crosses before flowing into the Saint Lawrence river. Although this seigniory was allotted in 1636, the act of the concession was confirmed in 1647.[1]
The toponym "Rivière Portneuf" was formalized on December 5, 1968, at the Place Names Bank of the Commission de toponymie du Québec.[2]