Sir Anthony Charles Lynton Blair (born 6 May 1953) is a British politician who served as Prime Minister of the United Kingdom from 1997 to 2007 and Leader of the Labour Party from 1994 to 2007. He was Leader of the Opposition from 1994 to 1997 and held various shadow cabinet posts from 1987 to 1994. Blair was Member of Parliament (MP) for Sedgefield from 1983 to 2007, and was special envoy of the Quartet on the Middle East from 2007 to 2015. He is the second-longest-serving prime minister in post-war British history after Margaret Thatcher, the longest-serving Labour politician to have held the office, and the first and only person to date to lead the party to three consecutive general election victories. Blair founded the Tony Blair Institute for Global Change in 2016, and currently serves as its Executive Chairman.

Blair attended the independent school Fettes College, studied law at St John's College, Oxford, and qualified as a barrister. He became involved in the Labour Party and was elected to the House of Commons in 1983 for the Sedgefield constituency in County Durham. As a backbencher, Blair supported moving the party to the political centre of British politics. He was appointed to Neil Kinnock's shadow cabinet in 1988 and was appointed shadow home secretary by John Smith in 1992. Following Smith's death in 1994, Blair won a leadership election to succeed him.