The Kinross and Western Perthshire by-election of 7 November 1963 was a by-election to the House of Commons. It was unique among by-elections since 1918 in that one of the candidates was the sitting Prime Minister, Alec Douglas-Home; he was nominated for the constituency after disclaiming a peerage, as he felt he needed to be a member of the Commons rather than the House of Lords during his premiership. Douglas-Home won the election.

The prime minister of the United Kingdom is the head of government of the United Kingdom. The prime minister advises the sovereign on the exercise of much of the royal prerogative, chairs the Cabinet and selects its ministers. As modern prime ministers hold office by virtue of their ability to command the confidence of the House of Commons, they sit as members of Parliament. The current prime minister is Rishi Sunak of the Conservative Party, who assumed the office on 25 October 2022.