رهبر اپوزیسیون رسمی (کانادا)
یادداشت

↑  Tupper lost his seat in the 1900 election and resigned as party leader and Leader of the Opposition three months later.
↑  Died in office.
↑  McKenzie served as Leader of the Opposition from Laurier's death until King's election as leader of the Liberal Party.
↑  Arthur Meighen's Conservatives formed the Official Opposition although the Progressive Party had more seats.
↑  Meighen failed to win his seat and immediately resigned as leader of the Conservative Party.
↑  Guthrie served as Leader of the Opposition from shortly after Meighen's resignation until Bennett's election as leader of the Conservative Party.
↑  Hanson served as Leader of the Opposition from Manion's resignation until Meighen's election as leader of the Conservative Party. He continued as acting Leader of the Opposition throughout Meighen's term as Conservative leader, as Meighen failed in his attempts to win election to the House of Commons, and continued as acting Leader of the Opposition from Bracken's election as PC leader until his own resignation.
↑  The Conservative Party was renamed the Progressive Conservative Party in 1942.
↑  Graydon served as Leader of the Opposition from Hanson's resignation until Bracken entered Parliament in the 20th general election.
↑  Rowe served as acting Leader of the Opposition in winter 1954-55 due to Drew's poor health.
↑  Rowe initially served as acting Leader of the Opposition for six weeks when Drew was ill, then became interim leader of the Progressive Conservative Party until Diefenbaker was elected as PC leader.
↑  Starr served as Leader of the Opposition from Stanfield's election as PC leader until Stanfield entered Parliament via by-election.
↑  Nielsen served as acting Leader of the Opposition for the two weeks preceding Clark's resignation from the post of leader of the PC Party. He continued as Leader of the Opposition during the 1983 Progressive Conservative leadership campaign in which Clark unsuccessfully ran to succeed himself. Nielsen continued as Leader of the Opposition from Mulroney's election as PC leader until Mulroney entered Parliament via by-election.
↑  Gray became acting Leader of the Opposition after Turner announced his intention to step down as party leader. Gray continued as Leader of the Opposition from Chrétien's election as Liberal leader until Chrétien entered Parliament via a by-election.
↑  Duceppe served as Leader of the Opposition during the 1996 Bloc Québécois leadership election initiated by Bouchard's sudden resignation from federal politics to become نخست‌وزیر پارلمانی of استان کبک.
↑  Grey served as Leader of the Opposition during the 2000 Canadian Alliance leadership campaign in which Manning unsuccessfully ran to succeed himself. She continued as Leader of the Opposition from Day's election as Alliance leader until Day entered Parliament via byelection.
↑  Hill served as Leader of the Opposition during the 2004 Conservative leadership election in which Harper successfully ran to be leader of the new party.
↑  Although the PC Party and Canadian Alliance were recognized as merged on December 7, 2003, by Elections Canada for the purposes of elections law, they did not merge their parliamentary رایزنش until February 2, 2004.
↑  Graham served as interim رهبر پارلمانی and Leader of the Opposition until the 2006 Liberal leadership convention.
↑  Ignatieff served as interim Leader of Liberal Party until being elected Leader in the 2009 Liberal leadership convention.
↑  Died in office.
↑  Turmel became interim leader of the NDP on July 28, 2011, when Layton began his leave of absence, but she did not become the Leader of the Opposition until Layton's death.
↑  Ambrose was elected interim party leader by the Conservative caucus to serve until a permanent leader was elected at the 2017 Conservative Party of Canada leadership election.
↑  Bergen was elected interim party leader by the Conservative caucus to serve until a permanent leader was elected at the 2022 Conservative Party of Canada leadership election.