By-elections to the 40th Canadian Parliament

The riding of New Westminster—Coquitlam had been vacant since April 13, when Dawn Black resigned to run in the British Columbia provincial election.

The riding of Cumberland—Colchester—Musquodoboit Valley had been vacant since April 30, 2009, when Bill Casey resigned to accept a posting from the provincial government of Nova Scotia.[2]

Scott Armstrong was nominated unopposed by the Conservatives. Farmer Jim Burrows defeated 2008 Liberal candidate Tracy Parsons for the Liberal nomination on September 12, 2009.

The riding of Montmagny—L'Islet—Kamouraska—Rivière-du-Loup had been vacant since May 21, when Paul Crête resigned to run as a Parti Québécois candidate in the provincial Rivière-du-Loup by-election.

According to the Regina Leader-Post, Bernard Généreux won the by-election.[3]

On June 25, 2009, Réal Ménard announced that he would resign from the Hochelaga constituency effective September 16 to run as a Vision Montreal candidate for borough mayor of Mercier–Hochelaga-Maisonneuve in the fall 2009 municipal elections in Montreal.[10]

Daniel Paillé won the by-election according to CBC News.[11]

The three seats were vacant due to the resignations of Inky Mark, Judy Wasylycia-Leis, and Maurizio Bevilacqua from the House of Commons. The incumbents had resigned their seats to run for the mayoralty of their hometowns in municipal elections. Bevilacqua was subsequently elected mayor of Vaughan, Ontario while Wasylycia-Leis and Mark were defeated in their attempts. A further three seats, Calgary Centre-North, Haute-Gaspésie—La Mitis—Matane—Matapédia and Prince George—Peace River also became vacant in late October or November, however these vacancies occurred too late to be included in the November 29 by-election call.

Under Canadian election law, a by-election must be formally announced no earlier than 11 days and no later than 180 days after a vacancy officially takes effect. Due to the timing of the respective resignations, this means that the date of the Winnipeg North by-election had to be announced by October 27, while the scheduling period for all of the other four by-elections extended into 2011.[20] Consequently, the Winnipeg North by-election had to be called at least a week before the window opened in which Prince George—Peace River and Haute-Gaspésie—La Mitis—Matane—Matapédia by-elections could be called.

When multiple vacancies exist, it is customary, though not mandatory, for by-elections to be held on the same date.

A by-election was held in the Manitoba federal riding of Dauphin—Swan River—Marquette as incumbent MP Inky Mark resigned effective September 15, 2010 as the Conservative Party of Canada Member of Parliament in order to run unsuccessfully for mayor of Dauphin, Manitoba.[21]

A by-election was held in the Ontario federal riding of Vaughan as Liberal Maurizio Bevilacqua resigned to run successfully for mayor of Vaughan, Ontario.[22]

A by-election was held in the Manitoba federal riding of Winnipeg North after New Democratic Party MP Judy Wasylycia-Leis resigned to run unsuccessfully for Mayor of Winnipeg. The seat had been vacant for almost seven months by the time of the vote.

With the addition of the Pirate Party candidate Jeff Coleman, the by-election in Winnipeg North marked the first election or by-election to run a member of the Pirate Party outside of Europe.[23]

Until pre-empted by the issuance of writs for the 41st federal election, three federal by-elections were pending in 2011 to fill vacant seats in the House of Commons.

A by-election call was pending in the Alberta federal riding of Calgary Centre-North, where Conservative MP Jim Prentice announced on November 4, 2010 he was resigning as Environment Minister effective immediately and that he would be resigning as Member of Parliament for Calgary Centre-North by the end of the year to take a job as vice-chairman of the Canadian Imperial Bank of Commerce.[24] Prentice resigned as the Conservative Member of Parliament for Calgary Centre-North on November 14, 2010.[25] The Prime Minister theoretically had until May 2, 2011 to call a by-election.

Soon after the announcement of Prentice's impending resignation, both Ric McIver and Barb Higgins – the second and third place mayoralty finishers in the 2010 municipal election in Calgary – expressed interest in running for the Conservative Party nomination in Calgary Centre-North.[26] Current Calgary-Foothills MLA Len Webber and recent aldermanic candidate Sean Chu were also rumored to be testing the waters. Ultimately, university administrator and Calgary—Nose Hill riding president Michelle Rempel was acclaimed as the Conservative candidate on December 17, 2010.[27]

Former Ontario Liberal MP Robert Nault and former mayor of Calgary Dave Bronconnier were rumored to be seeking the Liberal nomination. However, Liberal leader Michael Ignatieff appointed Stephen Randall – a University of Calgary professor and the former dean of the Faculty of Social Sciences – as the party's candidate on January 6, 2011.[28]

Heather MacIntosh was nominated to replace Dr. Eric Donovan as the Green Party candidate after winning a three way nomination contest on October 26, 2010.

A by-election was pending in the Quebec federal riding of Haute-Gaspésie—La Mitis—Matane—Matapédia, where Bloc Québécois MP Jean-Yves Roy resigned on October 22, 2010 as a result of chronic health problems.[29] The Prime Minister theoretically had until April 20, 2011 to drop the writ for a by-election in that riding.

A by-election was pending in the British Columbia federal riding of Prince George—Peace River due to the resignation of Conservative MP Jay Hill on October 25, 2010. Prime Minister Harper had until April 22, 2011 to call a by-election.[30]

Notably, in his resignation announcement Hill appeared to suggest that he expected the 41st federal election to be called before a by-election could take place in this riding. He was correct; the Harper government lost a confidence motion on March 25, 2011, triggering an election.[31]

Persons seeking the Conservative Party nomination were former Prince George mayor Colin Kinsley,[30] Tumbler Ridge councilor Jerrilyn Schembri, Prince George city councilor Cameron Stolz, Fort St. John councillors Don Irwin and Dan Davies and Conservative riding association CEO Bob Zimmer.[32] Bob Zimmer was declared the Conservative candidate following a March 11, 2011 nomination meeting in Prince George.[33]

Hilary Crowley was announced as the Green Party candidate on November 12, 2010.[34] Former Deputy Premier and Prince George area MLA, Lois Boone as acclaimed as the NDP candidate on November 27, 2010.[35]

On March 28, 2011, lawyer Ben Levine was nominated as the Liberal candidate.[36]