The Profumo affair was a British political scandal that originated with a brief sexual relationship in 1961 between John Profumo, the Secretary of State for War in Harold Macmillan's government, and Christine Keeler, a 19-year-old would-be model. In March 1963, Profumo denied any impropriety in a personal statement to the House of Commons, but was forced to admit the truth a few weeks later. He resigned from the government and from Parliament. The repercussions severely damaged Macmillan's self-confidence, and he resigned as prime minister on health grounds in October 1963. His Conservative Party was marked by the scandal, which may have contributed to its defeat by Labour in the 1964 general election.

When the Profumo–Keeler affair was first revealed, public interest was heightened by reports that Keeler may have been simultaneously involved with Captain Yevgeny Ivanov, a Soviet naval attaché, thereby creating a possible security risk. Keeler knew both Profumo and Ivanov through her friendship with Stephen Ward, an osteopath and socialite who had taken her under his wing. The exposure of the affair generated rumours of other scandals, and drew official attention to the activities of Ward, who was charged with a series of immorality offences. Perceiving himself as a scapegoat for the misdeeds of others, Ward took a fatal overdose during the final stages of his trial, which found him guilty of living off the immoral earnings of Keeler and her friend Mandy Rice-Davies.

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