The rivière au Lard (English: Bacon River) flows on 21.2 kilometres (13.2 mi) in the municipality of Notre-Dame-du-Mont-Carmel, then those of Saint-Maurice, Saint-Narcisse and Saint-Luc-de-Vincennes, in the Les Chenaux Regional County Municipality, in the administrative region of Mauricie, in Quebec, in Canada.

The Rivière au Lard rises in the marshes east of Lac Valmont in the municipality of Notre-Dame-du-Mont-Carmel.

After recovering two streams, the river heads 4.2 kilometres (2.6 mi) to the east and crosses the boundary of the municipality of Saint-Maurice.

The start of its 21.2 kilometres (13.2 mi) route is mainly in the forest, while the end is in the agricultural area.

The toponym Rivière au Lard was formalized on December 5, 1968 at the Place Names Bank of the Commission de toponymie du Québec[4] Download coordinates as: