Louiseville is a town in the Mauricie region of the province of Quebec in Canada. It is located near the mouth of the 'Rivière-du-Loup', on the north shore of Lac Saint-Pierre.

Route 348 is a provincial highway located in the Lanaudière and Mauricie regions of Quebec. It runs from the junction of Route 125 just west of Rawdon and ends at Route 138 in Louiseville. It overlaps Route 337 and Route 341 in Rawdon, Route 131 northwest of Saint-Félix-de-Valois, and Route 347 in Saint-Gabriel-de-Brandon.