The Canadian federal election of 1963 resulted in the defeat of the minority Progressive Conservative government of John George Diefenbaker.

During the Tories' last year in office, members of the Diefenbaker's Cabinet attempt to remove him from the leadership of the party, and therefore from the Prime Minister's office. In addition to concern within the party about Diefenbaker's mercurial style of leadership, there had been a serious split in party ranks over the issue of stationing American nuclear missiles (see Bomarc missile) on Canadian soil. Diefenbaker and his allies opposed this proposal, while many other Conservatives and the opposition Liberals were in favour. Minister of National Defence Douglas Harkness resigned from Cabinet on February 4, 1963 because of Diefenbaker's opposition to accepting the missiles. The next day, the government lost two non-confidence motions on the issue, prompting the election.

The Liberal Party of Lester Pearson ran on a platform promising that, if elected, they would begin their term with "60 Days of Decision" on questions such as introducing a new Canadian flag, reforming healthcare, and a public pension plan, along with other legislative reforms.

Despite winning 41% of the vote, which is usually sufficient for ensuring the election of a majority government, the Liberals fell seven seats short of their target. The Liberals formed a minority government that was dependent on the support of the social democratic New Democratic Party of Canada in order to pass legislation.

The NDP had been formed in 1961 by the Co-operative Commonwealth Federation, another social democratic party, and by the Canadian Labour Congress. The 1963 election was the second vote contested by the NDP. The party won slightly fewer votes, and two fewer seats, than they had received in the 1962 election. They were again disappointed by the failure of their new partnership with the labour movement to produce an electoral breakthrough, particularly in the province of Ontario, which has the largest population and the largest number of seats in the Canadian House of Commons.

Social Credit was unable to increase its representation in western Canada, and lost four of its Quebec seats. The continuing lop-sided result led to a split in the party when Thompson refused to step aside so that Caouette could become party leader. Caouette and his followers left the Social Credit Party to sit as a separate social credit caucus, the Ralliement des créditistes.

National results

Notes:

"Previous" refers to to standings at previous election, not to standings in the House of Commons at dissolution.

n.a. = not applicable - the party was not recognized in the previous election

x - less than 0.005% of the popular vote

Results by province

xx - less than 0.05% of the popular vote