By-elections to the 15th Canadian Parliament were held to elect members of the House of Commons of Canada between the 1925 federal election and the 1926 federal election. Initially the Liberal Party of Canada and the Progressive Party of Canada formed a coalition government for the 15th Canadian Parliament, following the King–Byng Affair the Conservative Party of Canada was given a minority government, which dissolved quickly.

The list includes a Ministerial by-election which occurred due to the requirement that Members of Parliament recontest their seats upon being appointed to Cabinet. These by-elections were almost always uncontested. This requirement was abolished in 1931.

By-election Date Incumbent Party Winner Party Cause Retained
Middlesex West March 29, 1926 John Campbell Elliott      Liberal John Campbell Elliott      Liberal Recontested upon appointment as Minister of Labour Yes
Regina March 16, 1926 Francis Nicholson Darke      Liberal Charles Avery Dunning      Liberal Resignation to provide a seat for Dunning Yes
Prince Albert February 15, 1926 Charles McDonald      Liberal William Lyon Mackenzie King      Liberal Resignation to provide a seat for Mackenzie King Yes
Bagot December 7, 1925 Joseph Edmond Marcile      Liberal Georges Dorèze Morin      Liberal Death Yes

See also