Lac-Saint-Jean is a federal electoral district in the Saguenay–Lac-Saint-Jean region of northeast Quebec, Canada, that was represented in the House of Commons of Canada from 1925 to 2004, and has been represented since 2015.

This riding was created in 1924 form parts of Chicoutimi—Saguenay riding and was originally named in English Lake St. John. It originally consisted of the counties of Lake St. John East and Lake St. John West. It was renamed Lake St-John—Roberval in 1935.

The 1947 redistribution created a new riding with the name Lac-Saint-Jean (in English and French), created from parts of the Lake St-John—Roberval riding. It was initially defined to consist of the county of Lake St. John East and the towns of Riverbend, Ile Maligne and St. Joseph-d'Alma; and parts of the county of Lake St. John West.

In 1966, it was redefined to consist of the City of Alma, the Town of Desbiens, the County of Lac-Saint-Jean East, and parts of the Counties of Lac-Saint-Jean West and Chicoutimi.

In 1976, it was redefined to consist of the Cities of Alma and Chicoutimi North, and parts of the Counties of Chicoutimi and Lac-Saint-Jean East.

In 1987, it was redefined to consist of the towns of Alma, Desbiens and Métabetchouan; the County of Lac-Saint-Jean-Est; and parts of the Counties of Chicoutimi, Charlevoix-Ouest, Lac-Saint-Jean-Ouest and Montmorency.

In 1996, it was redefined to consist of the towns of Alma, Desbiens and Métabetchouan; the County Regional Municipality of Lac-Saint-Jean-Est; and parts of in the County Regional Municipality of Le Fjord-du-Saguenay.

Its name was changed in 2000 to "Lac-Saint-Jean—Saguenay".

In 2003, it was abolished when it was redistributed into Chicoutimi—Le Fjord, Jonquière—Alma and Roberval ridings.

The 2012 electoral redistribution saw this riding re-created from parts of Roberval—Lac-Saint-Jean and Jonquière—Alma.

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