Lac-Saint-Jean (French: [lak sɛ̃ ʒɑ̃], Quebec French pronunciation: [lak sẽ ʒã]) 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.

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.

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