Lac-Saint-Jean is a provincial electoral district in the Saguenay-Lac-Saint-Jean region of Quebec, Canada, that elects members to the National Assembly of Quebec. It notably includes the municipalities of Alma, Métabetchouan–Lac-à-la-Croix and Saint-Bruno. It was created for the 1890 election. In the change from the 2001 to the 2011 electoral map, it lost Saint-André-du-Lac-Saint-Jean and part of the unorganized territory of Passes-Dangereuses to Roberval electoral district. It is named for Lac Saint-Jean.