2018 Chicoutimi—Le Fjord federal by-election

The riding is located about 200 kilometres north of Quebec City,^[3] and consists of the northern part of the Chicoutimi borough of Saguenay, as well as the La Baie borough and the municipalities of Ferland-et-Boilleau, L'Anse-Saint-Jean, Petit-Saguenay, Rivière-Éternité and Saint-Félix-d'Otis and the unorganized territory of Lalemant.

The by-election was triggered by the announcement by Liberal MP Denis Lemieux on November 6, 2017, that he would be resigning his seat for family reasons;^[4] his resignation took effect on December 1, 2017.^[5] Lemieux was first elected in the 2015 federal election with 31.1% of the vote, narrowly defeating NDP incumbent Dany Morin.

Port Saguenay board member Lina Boivin, who was endorsed by Lemieux,^[6][7] defeated former Saint-Charles de Bourget mayor Michel Ringuette^[8] for the Liberal nomination,^[9][10] held in May 2018. A rumoured candidate for the Liberal nomination was former Paralympic athlete and head of university sport at UQAC, Philippe Gagnon.^[11] Former municipal councillor and former Quebec Liberal MNA candidate Joan Simard, local businessman Simon-Pierre Murdock, who later endorsed Boivin, and Chicoutimi-Nord Municipal Councillor Marc Pettersen declined to run for the nomination.^[11][12][13] "Promotion Saguenay" Director of Industrial Development and Corporate Affairs Claude Bouchard had his candidacy rejected by the federal Liberal party.^[9][11]

Éric Dubois, a union advisor at the CSN and former federal NDP candidate, was acclaimed as the NDP candidate on January 22, 2018.^[14] Dany Morin and former Ontario MPP and federal NDP leader Jagmeet Singh both expressed interest in running for the nomination but decided against it.^[15][16][17]

Catherine Bouchard-Tremblay was acclaimed as the candidate for the Bloc Québécois on May 18, 2018.^[18] Former Dubuc PQ MNA Jean-Marie Claveau^[19] and teacher Valérie Tremblay^[19] were rumoured to be interested in running for the Bloc Québécois nomination. Former Chicoutimi—Le Fjord BQ MP Robert Bouchard, Saguenay firefighter Mario Gagnon,^[20] and UQAC political science professor Michel Roche declined to run for the nomination.^[19]

The short-lived « Groupe parlementaire québécois » / « Québec debout », formed by seven members of parliament after they left the Bloc Québécois, considered nominating a candidate^[10] but failed to do so.

Two-time Ron Lapointe Trophy winning QMJHL coach Richard Martel was named the Conservative candidate on December 20, 2017.^[21]

Lynda Youde was acclaimed as the candidate for the Green Party on May 22, 2018.^[22]

The Speaker's warrant regarding the vacancy was received on December 4, 2017; under the Parliament of Canada Act the writ for a by-election had to be dropped no later than June 2, 2018, 180 days after the Chief Electoral Officer was officially notified of the vacancy via a warrant issued by the Speaker.^[23] On May 13, 2018, the writ was dropped for a by-election for June 18, 2018.^[24]

• By-elections to the 42nd Canadian Parliament