The 2007 Labour Party leadership election was triggered on 10 May 2007 by incumbent leader Tony Blair's announcement that he would resign as leader on 27 June. At the same time that Blair resigned, John Prescott resigned as Deputy Leader, triggering a concurrent election for the deputy leadership.

Sir Anthony Charles Lynton Blair 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 served as 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. He is the second-longest-serving prime minister in post-war British history and the longest-serving Labour politician to have held the office.