The list of Quebec by-elections includes every by-election held in the Canadian province of Quebec since Confederation.
By-elections occur whenever there is a vacancy in the National Assembly (known as the Legislative Assembly until 1968), although an imminent general election may allow the vacancy to remain until the dissolution of parliament.
A by-election occurs whenever there is a vacancy in the Quebec legislature.
Vacancies can occur for the following reasons: * Tomassi was a former Liberal *Therien was a former Liberal *Larouche was a former Liberal Upon the abolition of the Legislative Council on December 31, 1968, the Legislative Assembly of Quebec is renamed the National Assembly of Quebec * Aquin was a former Liberal † Won by acclamation † Won by acclamation no by-elections † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation † Won by acclamation * The Parti National was the official name of the Quebec Liberal Party during this period † Won by acclamation † Won by acclamation * Flynn and Pacquet were former Liberals who crossed the floor to topple the Joly government † Won by acclamation † Won by acclamation † Won by acclamation