John Simon Bercow is a British former politician who was Speaker of the House of Commons from 2009 to 2019, and Member of Parliament (MP) for Buckingham between 1997 and 2019. A member of the Conservative Party prior to becoming Speaker, he was the first MP since Selwyn Lloyd in 1971 to be elected Speaker without having been a Deputy Speaker. After resigning as Speaker in 2019 and opting not to seek re-election as MP for Buckingham in the 2019 general election, Bercow left Parliament. In 2021, he joined the Labour Party but was suspended in 2022.

The Speaker of the House of Commons is the presiding officer of the House of Commons, the lower house and primary chamber of the Parliament of the United Kingdom. The current speaker, Sir Lindsay Hoyle, was elected Speaker on 4 November 2019, following the retirement of John Bercow. Hoyle began his first full parliamentary term in the role on 17 December 2019, having been unanimously re-elected after the 2019 general election.