Lac-Saint-Jean (formerly Lac-Saint-Jean—Saguenay) is a federal electoral district in Quebec, Canada, that was represented in the House of Commons of Canada from 1949 to 2004, and was represented again after the 2015 election.

This riding was created in 1947 from parts of 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.

This riding has elected the following Members of Parliament:

Riding history from the Library of Parliament:

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