By-elections to the 1st Canadian Parliament were held to elect members of the Canadian House of Commons between the 1867 federal election and the 1872 federal election. The Conservative Party of Canada led a majority government for the 1st Canadian Parliament.
The list includes Ministerial by-elections 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.
References
By-elections to the 1st Canadian Parliament Wikipedia(Text) CC BY-SA