The Canadian federal election of 1878 was held on September 17 to elect members of the Canadian House of Commons of the 4th Parliament of Canada. It resulted in the end of Prime Minister Alexander Mackenzie's Liberal government after only one term in office. Canada suffered an economic depression during Mackenzie's term, and his party was punished by the voters for it. The Liberals' policy of free trade also hurt their support with the business establishment in Toronto and Montreal.