By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
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Brandon | February 5, 1930 | Robert Forke | CA|Liberal-Progressive|background}}| | Liberal-Progressive | Thomas Alexander Crerar | CA|Liberal|background}}| | Liberal | Called to the Senate | No |
Bagot | January 27, 1930 | Georges Dorèze Morin | CA|Liberal|background}}| | Liberal | Cyrille Dumaine | CA|Liberal|background}}| | Liberal | Death | Yes |
Châteauguay—Huntingdon | January 27, 1930 | James Alexander Robb | CA|Liberal|background}}| | Liberal | Dennis James O'Connor | CA|Liberal|background}}| | Liberal | Death | Yes |
Prescott | July 29, 1929 | Louis-Mathias Auger | CA|Independent Liberal|background}}| | Independent Liberal | Élie-Oscar Bertrand | CA|Liberal|background}}| | Liberal | Resignation following criminal charge | No |
Lanark | July 29, 1929 | Richard Franklin Preston | CA|Conservative (historical)|background}}| | Conservative | William Samuel Murphy | CA|Independent Conservative|background}}| | Independent Conservative | Death | No |
Vaudreuil-Soulanges | July 29, 1929 | Lawrence Alexander Wilson | CA|Liberal|background}}| | Liberal | Lawrence Alexander Wilson | CA|Liberal|background}}| | Liberal | Resigned, intending to retire, but persuaded to run again | Yes |
Laprairie—Napierville | July 22, 1929 | Roch Lanctôt | CA|Liberal|background}}| | Liberal | Vincent Dupuis | CA|Liberal|background}}| | Liberal | Death | Yes |
Frontenac—Addington | July 22, 1929 | John Wesley Edwards | CA|Conservative (historical)|background}}| | Conservative | William Spankie | CA|Conservative (historical)|background}}| | Conservative | Death | Yes |
Lambton West | January 14, 1929 | William Goodison | CA|Liberal|background}}| | Liberal | Ross Gray | CA|Liberal|background}}| | Liberal | Death | Yes |
Joliette | December 17, 1928 | Jean-Joseph Denis | CA|Liberal|background}}| | Liberal | Charles-Édouard Ferland | CA|Liberal|background}}| | Liberal | Appointed a judge of the Superior Court of Quebec. | Yes |
Victoria | December 6, 1928 | Simon Fraser Tolmie | CA|Conservative (historical)|background}}| | Conservative | D'Arcy Plunkett | CA|Conservative (historical)|background}}| | Conservative | Resignation to become Premier of British Columbia. | Yes |
York West | October 29, 1928 | Henry Lumley Drayton | CA|Conservative (historical)|background}}| | Conservative | Earl Lawson | CA|Conservative (historical)|background}}| | Conservative | Appointed Chairman of the Liquor Control Board of Ontario. | Yes |
Maple Creek | November 25, 1927 | George Spence | CA|Liberal|background}}| | Liberal | William George Bock | CA|Liberal|background}}| | Liberal | Resignation to enter provincial politics in Saskatchewan | Yes |
Huron North | September 12, 1927 | John Warwick King | CA|Progressive|background}}| | Progressive | George Spotton | CA|Liberal|background}}| | Liberal | Death | No |
Victoria—Carleton | June 16, 1927 | James Kidd Flemming | CA|Conservative (historical)|background}}| | Conservative | Albion Roudolph Foster | CA|Liberal|background}}| | Liberal | Death | No |
Antigonish—Guysborough | January 18, 1927 | John Carey Douglas | CA|Conservative (historical)|background}}| | Conservative | William Duff | CA|Liberal|background}}| | Liberal | Death | No |
Kootenay East | November 9, 1926 | James Horace King | CA|Liberal|background}}| | Liberal | James Horace King | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Soldiers' Civil Re-establishment | Yes |
Bruce North | November 9, 1926 | James Malcolm | CA|Liberal|background}}| | Liberal | James Malcolm | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Trade and Commerce | Yes |
Dorchester | November 2, 1926 | Lucien Cannon | CA|Liberal|background}}| | Liberal | Lucien Cannon | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Solicitor General | Yes |
Richelieu | November 2, 1926 | Pierre-Joseph-Arthur Cardin | CA|Liberal|background}}| | Liberal | Pierre-Joseph-Arthur Cardin | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Marine and Fisheries | Yes |
Regina | November 2, 1926 | Charles Avery Dunning | CA|Liberal|background}}| | Liberal | Charles Avery Dunning | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Railways and Canals. | Yes |
Middlesex West | November 2, 1926 | John Campbell Elliott | CA|Liberal|background}}| | Liberal | John Campbell Elliott | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Public Works. | Yes |
Waterloo North | November 2, 1926 | William Daum Euler | CA|Liberal|background}}| | Liberal | William Daum Euler | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Customs and Excise. | Yes |
Brandon | November 2, 1926 | Robert Forke | CA|Liberal-Progressive|background}}| | Liberal-Progressive | Robert Forke | CA|Liberal-Progressive|background}}| | Liberal-Progressive | Recontested upon appointment as Minister of Immigration and Colonization | Yes |
Kenora—Rainy River | November 2, 1926 | Peter Heenan | CA|Liberal|background}}| | Liberal | Peter Heenan | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Labour | Yes |
Prince Albert | November 2, 1926 | William Lyon Mackenzie King | CA|Liberal|background}}| | Liberal | William Lyon Mackenzie King | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Prime Minister. | Yes |
Quebec East | November 2, 1926 | Ernest Lapointe | CA|Liberal|background}}| | Liberal | Ernest Lapointe | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Justice. | Yes |
Melville | November 2, 1926 | William Richard Motherwell | CA|Liberal|background}}| | Liberal | William Richard Motherwell | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Agriculture. | Yes |
Shelburne—Yarmouth | November 2, 1926 | Paul Lacombe Hatfield | CA|Liberal|background}}| | Liberal | James Ralston | CA|Liberal|background}}| | Liberal | Called to the Senate to provide a seat for Ralston | Yes |
St. James | November 2, 1926 | Fernand Rinfret | CA|Liberal|background}}| | Liberal | Fernand Rinfret | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Secretary of State of Canada. | Yes |
Châteauguay—Huntingdon | November 2, 1926 | James Robb | CA|Liberal|background}}| | Liberal | James Robb | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of Finance. | Yes |
Edmonton West | November 2, 1926 | Charles Stewart | CA|Liberal|background}}| | Liberal | Charles Stewart | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Minister of the Interior and Mines. | Yes |
Gloucester | November 2, 1926 | Peter Veniot | CA|Liberal|background}}| | Liberal | Peter Veniot | CA|Liberal|background}}| | Liberal | Recontested upon appointment as Postmaster General. | Yes |
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