Margaret Hilda Thatcher, Baroness Thatcher (13 October 1925 – 8 April 2013) was a British stateswoman 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 that office. A Soviet journalist dubbed her the "Iron Lady", a nickname that became associated with her uncompromising politics and leadership style. As prime minister, she implemented policies that became known as Thatcherism.

Thatcher was re-elected for a third term with another landslide in 1987, but her subsequent support for the Community Charge ("poll tax") was widely unpopular, and her increasingly Eurosceptic views on the European Community were not shared by others in her cabinet. She resigned as prime minister and party leader in 1990, after a challenge was launched to her leadership. After retiring from the Commons in 1992, she was given a life peerage as Baroness Thatcher (of Kesteven in the County of Lincolnshire) which entitled her to sit in the House of Lords.

In 2013, she died of a stroke at the Ritz Hotel, London, at the age of 87.

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