Côte-du-Sud is a provincial electoral district in the Bas-Saint-Laurent and Chaudière-Appalaches regions of Quebec, Canada, which elects members to the National Assembly of Quebec. It includes the entire territory of the following regional county municipalities: Montmagny, L'Islet, Kamouraska. It notably includes the municipalities of Montmagny, La Pocatière, L'Islet, Saint-Pascal, Saint-Jean-Port-Joli, Cap-Saint-Ignace, Saint-Pamphile, Saint-Alexandre-de-Kamouraska, Saint-Pacôme and Berthier-sur-Mer.