Lauren Booth (born Sarah Booth 22 July 1967, Islington, London) is an English broadcaster, journalist and pro-Palestinian activist. Booth is well-known as Tony Blair's sister-in-law. She currently works for Iran's state-owned 24-hour English language news channel, Press TV.

Lauren Booth is a half-sister of Cherie Blair and the sixth daughter of the actor Tony Booth; her mother is Pamela Smith (Cohen). She is the sister-in-law of former British prime minister Tony Blair. She was married to actor Craig Darby and the couple have two children, Alexandra and Holly. Her mother was Jewish although Lauren was not brought up a practising Jew.

As a journalist, Booth has written for the New Statesman, the Mail on Sunday, the Sunday Times and the Daily Mail. She is a vocal opponent of the Iraq War and a supporter of the Stop the War Coalition; a member of Woodcraft Folk, Media Workers Against the War and the National Union of Journalists. She has been a panellist on the BBC's Have I Got News For You, and a broadcaster on radio and television. She writes columns and features, mainly for the Mail on Sunday. She regularly reviews the UK newspapers on television for Sky News, BBC One and BBC News 24.

Anthony Charles Lynton Blair (born 6 May 1953) is a British Labour Party politician who served as the Prime Minister of the United Kingdom from 2 May 1997 to 27 June 2007. He was the Member of Parliament (MP) for Sedgefield from 1983 to 2007 and Leader of the Labour Party from 1994 to 2007. He resigned from all of these positions in June 2007.

Blair was elected Leader of the Labour Party in the leadership election of July 1994, following the sudden death of his predecessor, John Smith. Under his leadership, the party used the phrases "New Labour" and "New Socialism" to define its policy, and moved away from its support of state socialism since the 1960s and created a new version of the ethical socialism that was last pursued by Clement Attlee. Critics of Blair claim that "New Labour" did not adhere to socialism as claimed, and that it effectively advocated capitalism. Blair subsequently led Labour to a landslide victory in the 1997 general election. At 43 years old, he became the youngest Prime Minister since Lord Liverpool in 1812. In the first years of the New Labour government, Blair's government implemented a number of 1997 manifesto pledges, introducing the minimum wage, Human Rights Act and Freedom of Information Act, and carrying out devolution, establishing the Scottish Parliament, the National Assembly for Wales, and the Northern Ireland Assembly.