The leader of the Liberal Party of Canada (French: ) is the highest political office of the Liberal Party of Canada. The holder of the office is the formal political head of the party as a political organization and its parliamentary caucus in Canada's House of Commons, with specific authority to "speak for the party concerning any political issue".
The current leader is Mark Carney, the current prime minister of Canada. He is the 14th permanent leader. He succeeded former Prime Minister Justin Trudeau as party leader on March 9, 2025, following his victory in the party's leadership election, and succeeded Trudeau as prime minister five days later. Given that the Liberal Party has been one of the two principal contenders for power for most of Canada's history, most of the past holders of this office had served as prime minister.
The leader primarily functions in parliament and, when the party is in power, in government. Past leaders had from time to time designated deputy leaders in parliamentary caucus, or deputy prime ministers in their ministries, and assigned varying additional authorities and responsibilities to such deputies. There is currently no such deputy designated. The leader is also advised and assisted by two individuals holding offices through separate elections: the national caucus chair elected by the party's parliamentary caucus (currently Etobicoke—Lakeshore MP James Maloney); and party president, a volunteer elected by the party's convention to serve as the board chair and executive head of the party's administrative organization (currently Sachit Mehra).
Likelihood for premiership With the Liberal Party having been one of the two principal contenders for power for most of Canada's history, majority of the office holders has served as prime minister of Canada, including all seven permanent leaders in the 20th century.
11 of the party's 14 permanent leaders were among Canada's 24 prime ministers. Among them, five became prime ministers elect upon their selection as party leader, and six became prime ministers upon the party winning a subsequent general election.
Extended premiership While they number fewer than their conservative rivals, the 11 Liberal prime ministers collectively governed the nation for longer. Excluding the current leader, the ten former Liberal prime ministers led the nation's government for 92.5 of Canada's 157 years history (or 59%). Among them were William Lyon Mackenzie King, Canada's longest serving prime minister (three stints totaling 21.5 years) and Wilfrid Laurier, the Canadian prime minister with the longest uninterrupted tenure at 15.2 years.
Compared to their principal rivals, the former permanent leaders of the Conservative Party of Canada (and the leaders of its predecessor Progressive Conservative Party and the pre-1942 Conservative Party) fewer Liberal leaders left office without having led the party to victory at least once. Of the 14 permanent leaders, only four left office without having won an electoral mandate. In comparison, 10 the 21 former permanent Conservative leaders left office without having won an electoral mandate, and four of the 21 without ever leading their party through a general election.
Extended leadership The high proportion of past leaders having served as prime minister can be partially explained by their relative longevity. The tenure of the 13 permanent leaders averaged 11.5 years, comparing to 7.1 years for their 21 Conservative peers. Laurier's 31.7 years and King's 29 years tenure were the longest and second longest leadership among all parliamentary parties in Canada, and the only federal leaderships that lasted more than a quarter century.
Such lengthy leadership can be attributed to the Liberal Party's willingness to lets its rookie leader remain in office after electoral defeats, thus creating possibility of comeback victories. Among the 13 former Liberal leader, 11 experienced electoral defeats at least once. Six remained in office to fight another election, with three of the six having won or regained the premiership in a later election. Of the five who resigned their leadership after one election defeat, three did so having previously led the party to previous victory. Only two former leaders, Stephane Dion and Michael Ignatieff left office after only one unsuccessful attempt at the premiership, compared to six former Conservative leaders having left office after only one unsuccessful attempt.
History and election
Selection by caucus During the first and second parliamentary elections (or Dominion elections as they were known then) campaigns after Canadian Confederation, the Liberals were a loose grouping of reformers opposing the Liberal-conservative government of John A. Macdonald but without a formal leader. George Brown, a key Father of Confederation who was then leader of the Clear Grits in Ontario, was recognized as the informal leader in the first parliamentary election. Having led the Ontario Liberals to victory in early 1871 and served as the province's premier for about ten months, Blake's informal leadership during the second parliamentary election was more firmly established than Brown's. However, after failing to dislodge Macdonald in the polls in the 1872 election, Blake hesitated from taking on the role of leader.
With Blake unwilling to assume the role of permanent leader, reformers in parliament selected Alexander Mackenzie, a long-time ally of Brown who served as Treasurer in the brief Blake ministry in Ontario, as the group's first formal leader in March 1873. When the Macdonald government fell due to the Pacific Scandal in 1873, Mackenzie was called upon by Governor General Lord Dufferin to form a new ministry. He became Canada's first Liberal prime minister in November 1873, and let the Liberal Party to its first electoral victory in January 1874. The Liberal caucus also selected Blake as the next leader Blake in 1880, having pushed Mackenzie out of the way following party defeat in the 1878 election.
In 1887 upon Blake's resignation due to ill health, the Liberal caucus selected Wilfrid Laurier, a protégée of both Mackenzie and Blake, as its third leader, mostly out of deference to Blake's wishes, to the surprise of many including Laurier himself. Laurier accepted the leadership assuming it was a temporary assignment while Blake recover his health. It was not until June 1893, six years into his leadership, that Laurier would convene a national convention of the Liberal Party of the Dominion of Canada and have the 1,800 assembled delegates formally ratify his leadership.
Leadership convention The Liberal Party held nine leadership conventions between 1919 and 2009. The evolution of applicable rules reflects the evolving expectation of the members and the public for internal democracy, representation, and also the party's evolving emphasis of representation of certain groups in its decision making structure.
Equal weighting by electoral district – One notable constant feature for all nine convention was the equal representational weighting of all electoral districts. While the presence of ex-officio delegates and other delegate categories distorted the exact representation for each district slightly, equal weighting of all electoral districts remained the paramount requirement for delegate composition through all nine conventions, and remain the paramount feature for leadership elections to this day.
Balloting at conventions – The Liberal Party held its first leadership convention on August 7, 1919, the first national leadership convention in Canada for any party with parliamentary representation. Balloting continued until one candidate won a majority of votes, with no requirement for candidates to be eliminated. With only four candidate, the convention took five ballots to elect King over former finance minister William Stevens Fielding. Rules were added at the next convention in 1948 to eliminate the candidate with the fewest votes on a given ballot starting on the fifth ballot. It was unnecessary for that convention as Louis St. Laurent won the leadership on first ballot with close to 70% of the votes. In more recent convention, the elimination starts from first ballot, and candidates with less than 5% of the vote on the first ballot would also be eliminated. Since 1919, time has also been given between ballots for candidates to announce if they wish to withdraw and throw their support to another candidate.
Guarantee representation for women, disproportionate clout for youth – A fixed allocations of delegate positions were reserved for youth and women at conventions of the Liberal Party of Canada starting in 1948. At the 1948 convention that elected Louis St. Laurent, 82 delegate accreditations (out of approximately 1300) were designated for the Young Liberal Federation, accounting for 6.3% of the convention delegates. While only 28 delegate positions were designated for the Women Liberal Federation, women made up a substantial proportion of the regulate delegates. Starting at the 1990 convention, half of the electoral districts delegate accreditations were to be reserved for women, pushing the share of women delegates up to 46% at that convention. The proportion of delegate accreditation guaranteed to youth would reach its peak at the 2003 convention, with 1200 constituency youth delegates and over 500 campus club delegates making up close 40% of the convention. The party further added approximately 600 delegate accreditations for indigenous delegates at the 2006 convention, though a substantial portion of that went unfilled.
Final leadership conventions - Unbeknownst to delegates in attendance at the time, the 2006 leadership convention held in Montreal was the last competitive leadership convention held by any major political party at the national level. It was also the only instance in the federal Liberal Party's history the first-place contestant at the first ballot did not end up winning the contest. The 2006 convention ended with the surprise election of fourth-place contender Stephane Dion over frontrunners Michael Ignatieff and Bob Rae. Following Dion's resignation, the Liberal Party held its last leadership convention in May 2009 in Vancouver. The actual contest however ended months earlier in December 2008 when Dominic Leblanc and Bob Rae withdrew from the race, allowing presumed leader-elect Michael Ignatieff to assume the party's parliamentary leadership.
Direct vote by membership At the 2009 convention, the Liberal Party adopted a resolution specifying that future leadership elections would be conducted with direct election by members, effectively eliminated delegated convention as the final phase. The new leadership election mechanism retained equal weighting of all electoral district by allocating 100 "points" to each, and award them on the on the basis of the proportion of the first preference votes received by each leadership contestant. The mechanism adopted makes no provision for guaranteeing any minimum representation of youth, women or indigenous people in the electorate of future leadership contests.
The election mechanism was modified in the 2012 to allow Liberal supporters to registered to vote without becoming party members. In 2016, the Liberal Party overhauled its constitution, substituting key term party "members" with Registered Liberals, and convention "delegates" with attendees, retiring two key concepts of previous leadership contest. In the party's most recent leadership contest held in 2025, registered Liberals were the electorate.
List of leaders