By-elections to the 21st Canadian Parliament were held to fill vacancies in the House of Commons of Canada between the 1949 federal election and the 1953 federal election. The Liberal Party of Canada led a majority government for the 21st Canadian Parliament.
30 vacant seats were filled through by-elections. By-election Date Incumbent Party Winner Party Cause RetainedOutremont—St-JeanOctober 6, 1952Édouard-G. Rinfret LiberalRomuald Bourque LiberalAppointed a Judge of the Court of Queen's Bench of Quebec YesRichelieu—VerchèresOctober 6, 1952Gérard Cournoyer LiberalLucien Cardin LiberalResignationYesOntarioMay 26, 1952Walter Cunningham Thomson LiberalMichael Starr Progressive ConservativeResignationNoGloucesterMay 26, 1952Clovis-Thomas Richard LiberalAlbany M. Robichaud Progressive ConservativeResignationNoVictoria—CarletonMay 26, 1952Heber Harold Hatfield Progressive ConservativeGage W. Montgomery Progressive ConservativeDeathYesBrome—MissisquoiMay 26, 1952Henri A. Gosselin LiberalJoseph-Léon Deslières LiberalDeathYesRobervalMay 26, 1952Joseph-Alfred Dion LiberalPaul-Henri Spence Progressive ConservativeAppointed a Superior Court Judge of QuebecNoWaterloo NorthMay 26, 1952Louis Orville Breithaupt LiberalNorman C. Schneider LiberalAppointed Lieutenant Governor of Ontario YesCalgary WestDecember 10, 1951Arthur LeRoy Smith Progressive ConservativeCarl Olof Nickle Progressive ConservativeResignationYesBrandonJune 25, 1951James Ewen Matthews LiberalWalter Dinsdale Progressive ConservativeDeathNoQueen'sJune 25, 1951J. Lester Douglas LiberalJ. Angus MacLean Progressive ConservativeDeathNoWaterloo SouthJune 25, 1951Karl Homuth Progressive ConservativeHowie Meeker Progressive ConservativeDeathYesWinnipeg South CentreJune 25, 1951Ralph Maybank LiberalGordon Churchill Progressive ConservativeResignationNoRimouskiOctober 16, 1950Gleason Belzile LiberalJoseph-Hervé Rousseau Independent LiberalDeath NoSt. MaryOctober 16, 1950Gaspard Fauteux LiberalHector Dupuis LiberalResignationYesWellandOctober 16, 1950Humphrey Mitchell LiberalWilliam H. McMillan LiberalDeathYesJoliette—L'Assomption—MontcalmOctober 3, 1950Georges-Émile Lapalme LiberalMaurice Breton LiberalResignationYesAnnapolis—KingsJune 19, 1950Angus Alexander Elderkin LiberalGeorge Clyde Nowlan Progressive ConservativeElection declared void NoCartierJune 19, 1950Maurice Hartt LiberalLeon Crestohl LiberalDeathYesHalifaxJune 19, 1950Gordon B. Isnor LiberalSam Balcom LiberalCalled to the SenateYesBroadviewMay 15, 1950Thomas Langton Church Progressive ConservativeGeorge Hees Progressive ConservativeDeathYesHamilton WestMay 15, 1950Colin W. G. Gibson LiberalEllen Fairclough Progressive ConservativeAppointed a Judge of the Supreme Court of OntarioNoGatineauOctober 24, 1949Léon-Joseph Raymond LiberalJoseph-Célestin Nadon LiberalAppointed Clerk of the House of CommonsYesKamouraskaOctober 24, 1949Eugène Marquis LiberalArthur Massé Independent LiberalAppointed a Superior Court Judge of QuebecNoLaurierOctober 24, 1949Ernest Bertrand LiberalJ.-Eugène Lefrancois LiberalAppointed a Judge of the Court of King's Bench of QuebecYesMercierOctober 24, 1949Joseph Jean LiberalMarcel Monette LiberalAppointed a Judge of the Supreme Court of the District of MontrealYesGreenwoodOctober 24, 1949J. Ernest McMillin Progressive ConservativeJames Macdonnell Progressive ConservativeDeathYesNew WestminsterOctober 24, 1949Tom Reid LiberalWilliam Malcolm Mott LiberalCalled to the SenateYesRestigouche—MadawaskaOctober 24, 1949Benoît Michaud LiberalPaul-Léon Dubé Independent LiberalDeathNoJacques CartierOctober 4, 1949Elphège Marier LiberalEdgar Leduc IndependentAppointed a Superior Court Judge of QuebecNo
See also List of federal by-elections in Canada
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