The Labour Party Conference is the annual conference of the British Labour Party. It is formally the supreme decision-making body of the party and is traditionally held in the final week of September, during the party conference season when the House of Commons is in recess, after each year's second Liberal Democrat Conference and before the Conservative Party Conference. The Labour Party Conference opens on a Sunday and finishes the following Wednesday, with an address by the Deputy Leader of the Labour Party; the Leader's address is usually on the Tuesday. In contrast to the Liberal Democrat Conference, where every party member attending its Conference, either in-person or online, has the right to vote on party policy, under a one member, one vote system, or the Conservative Party Conference, which does not hold votes on party policy, at the Labour Party Conference, 50% of votes are allocated to affiliated organisations, and the other 50% to Constituency Labour Parties, but all voting in both categories is restricted to nominated representatives.

The Labour Party is a political party in the United Kingdom that has been described as an alliance of social democrats, democratic socialists, and trade unionists. The Labour Party sits on the centre-left of the political spectrum. In all general elections since 1922, Labour has been either the governing party or the Official Opposition. There have been six Labour prime ministers and thirteen Labour ministries. Since the 2010 general election, it has been the second-largest UK political party by the number of votes cast, behind the Conservative Party and ahead of the Liberal Democrats. The party holds the annual Labour Party Conference.