The October 1974 United Kingdom general election took place on Thursday 10 October 1974 to elect 635 members of the House of Commons. It was the second general election held that year; the first year that two general elections were held in the same year since 1910; and the first time that two general elections were held less than a year apart from each other since the 1923 and 1924 elections, which took place 10 months apart. The election resulted in the Labour Party, led by Prime Minister Harold Wilson, winning a bare majority of three seats. That enabled the remainder of the Labour government to take place, but it saw a gradual loss of its majority.

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.