John Rentoul (born 1958) is a British journalist who has been the chief political commentator for The Independent on Sunday since February 2004, and is seen as a "Labour-leaning journalist".
Rentoul was a journalist on the New Statesman between January 1983 and May 1988, latterly as Deputy Editor, and a political reporter for BBC's On The Record between 1988 and 1995. He became a political correspondent of The Independent in 1995 and the chief leader writer at The Independent from January 1997 before becoming chief political commentator for The Independent on Sunday in 2004. He has described having "slavish admiration" for Tony Blair. He is also a visiting professor in Contemporary History at Queen Mary, University of London. His biography of Tony Blair has passed through several editions.