List of Quebec by-elections

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.

Causes
A by-election occurs whenever there is a vacancy in the Quebec legislature. Vacancies can occur for the following reasons:


 * Death of a member.
 * Resignation of a member.
 * Voided results
 * Expulsion from the legislature.
 * Ineligibility to sit.
 * Appointment to the Legislative Council, Quebec's appointed upper house, which was abolished in 1968.
 * Appointment to the cabinet. Until 1927 incumbent members recontested their seats upon being appointed to Cabinet. These Ministerial by-elections were almost always uncontested.

39th National Assembly of Quebec 2008–2012

 * Tomassi was a former Liberal

35th National Assembly of Quebec 1994–1998

 * Therien was a former Liberal

34th National Assembly of Quebec 1989–1994

 * Larouche was a former Liberal

28th Legislative/National Assembly of Quebec 1966–1970
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

25th Legislative Assembly of Quebec 1956–1960
† Won by acclamation

23rd Legislative Assembly of Quebec 1948–1952
† Won by acclamation

19th Legislative Assembly of Quebec 1935–1936
no by-elections

18th Legislative Assembly of Quebec 1931–1935
† Won by acclamation

17th Legislative Assembly of Quebec (1927–1931)
† Won by acclamation

15th Legislative Assembly of Quebec 1919–1923
† Won by acclamation

14th Legislative Assembly of Quebec 1916–1919
† Won by acclamation

13th Legislative Assembly of Quebec 1912–1916
† Won by acclamation

12th Legislative Assembly of Quebec 1908–1912
† Won by acclamation

11th Legislative Assembly of Quebec 1904–1908
† Won by acclamation

10th Legislative Assembly of Quebec 1900–1904
† Won by acclamation

9th Legislative Assembly of Quebec 1897–1900
† Won by acclamation

8th Legislative Assembly of Quebec 1892–1897
† Won by acclamation

7th Legislative Assembly of Quebec 1890–1891
† Won by acclamation

6th Legislative Assembly of Quebec 1886–1890
† Won by acclamation


 * The Parti National was the official name of the Quebec Liberal Party during this period

5th Legislative Assembly of Quebec 1881–1886
† Won by acclamation

4th Legislative Assembly of Quebec 1878–1881
† Won by acclamation


 * Flynn and Pacquet were former Liberals who crossed the floor to topple the Joly government

3rd Legislative Assembly of Quebec 1875–1878
† Won by acclamation

2nd Legislative Assembly of Quebec 1871–1875
† Won by acclamation

1st Legislative Assembly of Quebec 1867–1871
† Won by acclamation