The 1990 Conservative Party leadership election was called on 14 November 1990 following the decision of Michael Heseltine, former defence and environment secretary, to challenge Margaret Thatcher, the incumbent Prime Minister of the United Kingdom, for leadership of the Conservative Party.
In the months leading up to the election, Thatcher's position was slipping due to her increasingly divisive and confrontational approach in the United Kingdom. Her Community Charge had proven to be highly unpopular and resulted in widespread riots across the country, while her Euroscepticism had begun to become a detriment to the Conservatives. The economy, which was booming, had started to enter the early stages of a recession due to high inflation. The tipping point came in October when Thatcher infamously refused the European Economic Community's plans for further integration, prompting her longest serving minister Geoffrey Howe to resign. Immediately following his resignation, Heseltine challenged Thatcher to a contest in November.