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, formerly Portneuf, a federal electoral district in Quebec Portneuf-sur-Mer, Quebec, a town in the La Haute-Côte-Nord RCM Saint-Léonard-de-Portneuf, Quebec, a municipality
United States Portneuf, Idaho, an unincorporated community in Bannock County Portneuf River (Idaho), a tributary of the Snake River Portneuf Wildlife Management Area, Bannock County, near the town of McCammon