The 15th Legislative Assembly of Quebec is the provincial legislature in Quebec, Canada that existed from June 23, 1919, to February 5, 1923. The Quebec Liberal Party led by Lomer Gouin and Louis-Alexandre Taschereau was the governing party. Taschereau succeeded Gouin in 1920 as Premier of Quebec.

• After the 1919 elections

This was the list of members of the Legislative Assembly of Quebec that were elected in the 1919 election:

Other MLAs were elected during the mandate

• Édouard Hamel, Quebec Liberal Party, Portneuf, October 11, 1920
• Nérée Morin, Quebec Liberal Party, Kamouraska, October 19, 1920
• Léonide-Nestor-Arthur Ricard, Quebec Liberal Party, Saint-Maurice, October 19, 1920
• Joseph-Hughes Fortier, Quebec Liberal Party, Beauce, December 15, 1921
• Jacob Nicol, Quebec Liberal Party, Richmond, December 15, 1921
• Louis-Philippe Mercier, Quebec Liberal Party, Trois-Rivières, December 15, 1921
• Cyrinus Lemieux, Quebec Liberal Party, Wolfe, December 15, 1921
• Joseph Gauthier, Parti ouvrier, Montreal-Ste-Marie, December 22, 1921
• Eugène Godbout, Quebec Liberal Party, Témiscouata, December 22, 1921
• Jean-Marie Richard, Quebec Liberal Party, Verchères, December 22, 1921
• Désiré Lahaie, Quebec Liberal Party, Labelle, August 17, 1922
• Ludger Forest, Quebec Liberal Party, Sherbrooke, September 7, 1922

The electoral map was reformed in 1922 prior to the elections that were held in the following year.

• Abitibi was formed from parts of Témiscamingue
• The Ottawa district was renamed Hull in 1919.
• Matapédia was formed from parts of Matane
• Montréal-Mercier was formed from parts of Montréal-Laurier and Montréal-Dorion.
• Montréal-Hochelaga was renamed Montréal-Saint-Henri.
• Montréal-Verdun was created from parts of Jacques-Cartier.
• Napierville and Laprairie merged to form Napierville-Laprairie.
• Papineau was formed from parts of Labelle.

• 1919 election results
• List of Historical Cabinet Ministers (Page 1)
• List of Historical Cabinet Ministers (Page 2)