The list of British Columbia by-elections includes every by-election held in the Canadian province of British Columbia. By-elections occur whenever there is a vacancy in the Legislative Assembly, although an imminent general election may allow the vacancy to remain until the dissolution of parliament. The most recent by-election took place on January 30, 2019, in the provincial electoral district of Nanaimo.

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

• Death of a member.^[1] The last time a sitting MLA died was Fred Gingell in 1999.^[2] In addition, elected MLA's sometimes die before taking their seats. The last time this happened was in 1924 when John McKie died before the first session.^[3]
• Resignation of a member.^[1]
• Recall of a member.^[1] This has never happened. However, former MLA Paul Reitsma was unofficially recalled because he resigned just as a recall attempt nearly succeeded.^[4]
• Voided results. The last time a by-election took place for this reason was in 1904.^[5] The most recent any election has come close to being voided was in 1963.^[6]
• Expulsion from the legislature.^[1]
• Ineligibility to sit.^[1]
• Winning in more than one district during a general election. The last time that happened was in 1921.^[7] It has been forbidden to run in multiple districts since 1940.^[8]
• A riding being established during a parliament. The only time a by-election took place because of this was in early 1934, in Columbia.^[9]
• Ministerial by-election, until the 1930s an MLA's seat was declared vacant and the occupant was required to re-offer upon being appointed to Cabinet. Such by-elections often resulted in the incumbent being acclaimed.

When there is a vacancy, a by-election must be called within six months of the Chief Electoral Officer learning of it. The only exception is when a member has been recalled. In that case, a by-election must be held with 90 days.^[1]

* Reitsma is a former Liberal.^[10]

* Dueck is a former Socred.^[11]

The Kamloops by-election was the most recent by-election won by the governing party until 2011. During these 30 years the governing parties lost seventeen consecutive by-elections.

There were no by-elections.

There were no by-elections.

Douglas Jung of the Progressive Conservative Party runs in the Vancouver Centre by-election, the first time any Chinese Canadian had run for a seat in a Canadian legislature.^[12]

These by-elections are held under the alternative vote system, the only two times (as of March 2008) by-elections had been held using that voting system.^[13] After the next general election, the voting system would revert to first past the post in time for the next by-election.^[12]

The Columbia by-election is notable for two reasons. First, it is the only one (as of March 2008) held due to a district being created during a parliament;^[9] Second, it is the last time (as of March 2008) a candidate won through acclamation.^[14]

† Won by acclamation; this date is the date of the return of the writ.^[9]

† Won by acclamation; this date is the date of the return of the writ.^[15]

† Won by acclamation; this date is the date of the return of the writ.^[7]

The Vancouver City by-election was won by Mary Ellen Smith. She is the first woman to run and be elected in a provincial-level election, which was also the first one where women could vote.^[16]

† Won by acclamation; this date is the date of the return of the writ.^[16]

~ 'Independent people's candidate', also endorsed by the Liberal Party.^[16]

* Endorsed by the United Mineworkers of America and "organized labour generally".^[16]

† Won by acclamation; this date is the date of the return of the writ.^[17]

† Won by acclamation; this date is the date of the return of the writ.^[18]

The August 16 by-election in the district of Lillooet is the last time a by-election had been held due to a voided result, as of March 2008.^[5] The November 18, 1903 by-election in Vancouver City is the first by-election held^[5] since political parties were introduced to the province.^[14]

† Won by acclamation; this date is the date of the return of the writ.^[5]

† Won by acclamation; this date is the date of the return of the writ.^[19]

† Won by acclamation; this date is the date of the return of the writ.^[20]

* Result was voided.^[21]

† Won by acclamation; this date is the date of the return of the writ.^[21]

† Won by acclamation; this date is the date of the return of the writ.^[22]

† Won by acclamation; this date is the date of the return of the writ.^[23]

† Won by acclamation; this date is the date of the return of the writ.^[24]

† Won by acclamation; this date is the date of the return of the writ.^[25]

† Won by acclamation; this date is the date of the return of the writ.^[26]

† Won by acclamation; this date is the date of the return of the writ.^[27]

• List of federal by-elections in Canada