The United Kingdom general election of 1964 was won by the Labour Party with a majority of four seats. It was held on 15 October 1964, just over five years after the previous election, and 13 years after the Conservative Party had retaken power. Both major parties had changed leaders in 1963: after the sudden death of Hugh Gaitskell early in the year, Labour chose Harold Wilson (who was then thought of as being on the party's centre-left), while Sir Alec Douglas-Home (then the Earl of Home) had taken over as Conservative leader and prime minister in the autumn after Harold Macmillan announced his resignation. Douglas-Home shortly afterwards disclaimed his title under the Peerage Act 1963 in order to lead the party from the Commons.
Macmillan had led the Conservatives in government since January 1957 and despite initially popularity and a resounding election victory in 1959, had become increasingly unpopular in the early 1960s, and Douglas-Home faced a difficult task in rebuilding the party's popularity with just a year elapsing between taking office and having to face a general election. Wilson had begun to try to tie the Labour Party to the growing confidence of Britain in the 1960s, asserting that the "white heat of revolution" would sweep away "restrictive practices... on both sides of industry". The Liberal Party enjoyed a resurgence after a virtual wipeout in the 1950s and doubled its share of the vote, primarily at the expense of the Conservatives. Although Labour did not increase its vote share significantly, the fall in support for the Conservatives led to Wilson securing a overall majority of four seats. This proved to be unworkable and Wilson called a snap election in 1966.
The pre-election campaign was prolonged, as Douglas-Home delayed calling a general election to give himself as much time as possible to improve the prospects of his party. The starting gun of the campaign was fired on 15 September 1964 when Douglas-Home saw the Queen and asked for a dissolution of Parliament. The campaign was dominated by some of the more voluble characters on the political scene: George Brown, Deputy Leader of the Labour Party, toured the country making energetic speeches and the occasional gaffe, and Quintin Hogg for the Conservatives responded in kind. The image of Hogg lashing out at a Wilson poster with his walking stick was one of the most striking of the campaign. Many party speakers, especially at televised rallies, had to deal with hecklers: in particular Douglas-Home was treated very roughly at a meeting in Birmingham.
The election resulted in a very slim majority of four seats for the Labour Party, and led to their first government since 1951. Labour achieved a swing of just over 3%, although its vote rose by only 0.2%. The main shift was the swing from the Conservatives to the Liberals of 5.7%. The Liberals won nearly twice as many votes as in 1959, partly because they had 150 more candidates. Wilson became Prime Minister, replacing Douglas-Home. The four-seat majority was not sustainable for a full Parliament, and Wilson called another general election in 1966. In particular, the small majority meant the government could not implement party policy of nationalising the steel industry, due to the opposition of two of its backbenchers, Woodrow Wyatt and Desmond Donnelly.
The election was also the only time in Britain's recent history when all seats were won by the three main parties: no minor parties, independents or splinter groups won any seats.