The rivière du Petit Portage (in English: Little Portage River) is a tributary of the west bank of the Chaudière River which flows northward to empty onto the south shore of the St. Lawrence River. The Petit Portage river flows in the municipalities of Saint-Hilaire-de-Dorset and Saint-Gédéon-de-Beauce, in the Beauce-Sartigan Regional County Municipality (MRC), in the administrative region of Chaudière-Appalaches, in Quebec, in Canada.