The Leader of the Opposition (French: Chef de l'Opposition) in Québec is the MNA in the National Assembly of Québec who leads the political party recognized as the Official Opposition. This status generally goes to the leader of the second largest party in the National Assembly.

Note that the leader of the Opposition is not always the leader of the political party with the second-largest number of seats, in cases where the leader of that party does not have a seat.

There was no Leader of the Opposition until March 1869, when the government's second budget was introduced.

Leaders of the Opposition

Liberal Leader

• Henri-Gustave Joly de Lotbinière (1869-1878)

Conservative Leader

• Joseph-Adolphe Chapleau (1878-1879)

Liberal Leaders

• Henri-Gustave Joly de Lotbinière (1879-1883)
• Honoré Mercier (1883-1887)

Conservative Leaders

• Louis-Olivier Taillon (1887-1890)
• Jean Blanchet (1890-1891)

Liberal Leader

• Félix-Gabriel Marchand (1892-1897)

Conservative Leaders

• Edmund James Flynn (1897-1904)
• Pierre-Évariste Leblanc (1905-1908)
• Joseph-Mathias Tellier (1909-1915)
• Philémon Cousineau (1915-1916)
• Arthur Sauvé (1916-1929)
• Camillien Houde (1929-1931)
• Charles Ernest Gault (1931-1932)
• Maurice Duplessis (1932-1936)

Liberal Leader

• Télesphore-Damien Bouchard (1936-1939)

Union Nationale Leader

• Maurice Duplessis (1939-1944)

Liberal Leaders

• Adélard Godbout (1944-1948)
• George Carlyle Marler (1948-1953)
• Georges-Émile Lapalme (1953-1960)

Union Nationale Leaders

• Yves Prévost (1960-1961)
• Antonio Talbot (1961-1961)
• Daniel Johnson, Sr. (1961-1966)

Liberal Leaders

• Jean Lesage (1966-1970)
• Robert Bourassa (1970-1970)

Union Nationale Leaders

• Jean-Jacques Bertrand (1970-1971)
• Gabriel Loubier (1971-1973)

Parti Québécois Leader

• Jacques-Yvan Morin (1973-1975)

Liberal Leaders

• Gérard D. Levesque (1976-1979)
• Claude Ryan (1979-1982)
• Gérard D. Levesque (1982-1985)
• Robert Bourassa (1985-1985)

Parti Québécois Leaders

• Pierre-Marc Johnson (1985-1987)
• Guy Chevrette (1987-1989)
• Jacques Parizeau (1989-1994)

Liberal Leaders

• Daniel Johnson, Jr. (1994-1998)
• Monique Gagnon-Tremblay (1998-1998)
• Jean Charest (1998-2003)

Parti Québécois Leaders

• Bernard Landry (2003-2005)
• Louise Harel (2005-2006)
• André Boisclair (2006-2007)

Action démocratique du Québec Leader

• Mario Dumont (2007-2008)

Parti Québécois Leader

• Pauline Marois (2008-2012)

Liberal Leaders

• Jean-Marc Fournier (2012-2013)
• Philippe Couillard (2013-2014)

Parti Québécois Leaders

• Stéphane Bédard (2014-2015)
• Pierre Karl Péladeau (2015-Present)