Anthony Charles Lynton "Tony" Blair (born 6 May 1953) is a British politician who served as Prime Minister of the United Kingdom from 2 May 1997 to 27 June 2007, Leader of the Labour Party from 1994 to 2007 and Member of Parliament for Sedgefield from 1983 to 2007. On the day he stood down as Prime Minister, he was appointed official Envoy of the Quartet on the Middle East on behalf of the United Nations, the European Union, the United States and Russia, and stepped down as an MP.

Tony Blair was elected Leader of the Labour Party in July 1994 following the sudden death of his predecessor, John Smith. Under Blair's leadership the party abandoned many policies that it had held for decades. Labour won a landslide victory in the 1997 general election, which ended 18 years of rule by the Conservative Party with the heaviest Conservative defeat since 1832.

Blair is the Labour Party's longest-serving Prime Minister, the only person to have led the Labour Party to three consecutive general election victories, and the only Labour Prime Minister to serve consecutive terms more than one of which was at least four years long.

Gordon Brown, Blair's Chancellor of the Exchequer during his entire ten years in office, succeeded him as Leader of the Labour Party on 24 June 2007 and as Prime Minister on 27 June 2007.