John Whitaker Straw (born 3 August 1946) is a British Labour politician, who has been the Member of Parliament for Blackburn since 1979. On 28 June 2007, he was appointed to the offices of Lord Chancellor and Secretary of State for Justice as part of new Prime Minister Gordon Brown's first Cabinet. Previously, he served as Home Secretary from 1997 to 2001, Foreign Secretary from 2001 to 2006 and Lord Privy Seal and Leader of the House of Commons from 2006 to 2007. He was a member of Tony Blair's first Cabinet.

He was born in Buckhurst Hill, Essex, England of part-Jewish background and brought up at Loughton, Essex by his mother, Joan Sylvia Gilbey on a council estate after his father Walter Arthur Whitaker Straw, an insurance salesman and the son of Arthur Whitaker Straw, left the family and condemned them to poverty. He was educated at Staples Road School, Loughton, and then boarded at Brentwood School, at that time a direct grant grammar school with largely LEA supported pupils, (where he was already expressing political ambitions and took the name "Jack", allegedly after the 14th century peasant leader Jack Straw—although "Jack" is a common diminutive of "John") and read law at the University of Leeds. While he was at Brentwood he opted out of the compulsory CCF (combined cadet force) on conscientious grounds.

Straw was elected chair of the Leeds University Labour Society at the 1966 Annual General Meeting, when the Society changed its name to Leeds University Socialist Society and withdrew its support from the Labour Party (a separate Labour Club was later formed by supporters of the Labour Party in Leeds University Union). When Straw disrupted a student trip to Chile, he was branded a "troublemaker acting with malice aforethought" by the Foreign Office. Straw was then elected president of Leeds University Union with the support of the Broad Left, a coalition including Liberal, Socialist (formerly Labour, see above) and the Communist Societies. The Leeds University Union Council recently reinstated Jack Straw's life membership of the union, as a previous motion had removed his life membership and led to the removal of his name from the Presidents’ Board owing to personal disagreement with his political decisions. At the National Union of Students conference at the end of 1967 he and David Adelstein, the Radicals leader from the London School of Economics, were defeated in their quest for officership in the NUS. That was repeated in April 1968 when Straw stood for NUS President and was defeated by Trevor Fisk. In 1969 he succeeded in being elected President of the increasingly more radical National Union of Students, having led the campaign to remove the "no politics" clause from the NUS constitution.