Portneuf may refer to:
Canada
- Portneuf Regional County Municipality, Quebec
- Portneuf, Quebec, a town in the Portneuf Regional County Municipality
- Portneuf (provincial electoral district), in Quebec
- Portneuf—Jacques-Cartier, a federal electoral district in Quebec, formerly known as Portneuf
- Portneuf-sur-Mer, Quebec, a town in the La Haute-Côte-Nord RCM, Quebec
- Saint-Léonard-de-Portneuf, Quebec, a municipality
United States
- Portneuf, Idaho, unincorporated community in Bannock County, Idaho
- Portneuf River (Idaho), tributary of the Snake River
- Portneuf Wildlife Management Area, Bannock County, near the town of McCammon