The 1959 United Kingdom general election was held on Thursday, 8 October 1959. It marked a third consecutive victory for the ruling Conservative Party, now led by Prime Minister Harold Macmillan. For the second time in a row, the Conservatives increased their overall majority in Parliament, this time to a landslide majority of 100 seats, having gained 20 seats for a return of 365. The Labour Party, led by Hugh Gaitskell, lost 19 seats and returned 258. The Liberal Party, led by Jo Grimond, again returned only six MPs to the House of Commons, but managed to increase its overall share of the vote to 5.9%, compared to just 2.7% four years earlier.

Hugh Todd Naylor Gaitskell was a British politician who served as Leader of the Labour Party and Leader of the Opposition from 1955 until his death in 1963. An economics lecturer and wartime civil servant, he was elected to Parliament in 1945 and held office in Clement Attlee's governments, notably as Minister of Fuel and Power following the bitter winter of 1946–47, and eventually joining the Cabinet as Chancellor of the Exchequer. Facing the need to increase military spending in 1951, he imposed National Health Service charges on dentures and spectacles, prompting the leading left-winger Aneurin Bevan to resign from the Cabinet.