James Trevor Oliver (born 27 May 1975) is a British chef and restaurateur. He is known for his approachable cuisine, which has led him to front numerous television shows and open many restaurants.

Born and raised in Clavering, Essex, he was educated in London before joining Antonio Carluccio's Neal Street restaurant as a pastry chef. While serving as a sous-chef at the River Café, he was noticed by Patricia Llewellyn of Optomen; and in 1999 the BBC aired his television show, The Naked Chef. This was followed by a first cook book, which became a No. 1 UK bestseller. His television work included a documentary, Jamie's Kitchen, which gained him an invitation from Prime Minister Tony Blair to visit 10 Downing Street.

In 2005 he opened a campaign, Feed Me Better, to introduce schoolchildren to healthier foods, which was later backed by the government. He was the owner of a restaurant chain, Jamie Oliver Restaurant Group, which opened its first restaurant, Jamie's Italian, in Oxford in 2008. The chain went into administration in May 2019.

His TED Talk won him the 2010 TED Prize. In June 2003 Oliver was awarded a Member of the Order of the British Empire.