Margaret Hilda Thatcher, Baroness Thatcher, was a British stateswoman and Conservative politician who served as Prime Minister of the United Kingdom from 1979 to 1990 and Leader of the Conservative Party from 1975 to 1990. She was the longest-serving British prime minister of the 20th century and the first woman to hold the position. As prime minister, she implemented economic policies known as Thatcherism. A Soviet journalist dubbed her the "Iron Lady", a nickname that became associated with her uncompromising politics and leadership style.

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.