Ion Courtenay Gill Trewin (13 July 1943 – 8 April 2015) was a British editor, publisher and author.
Born in London, the son of J. C. Trewin and Wendy Trewin (née Monk), Ion Trewin was educated at Highgate School.[1] He was the literary editor of The Times from 1972 to 1979 and then became an editor with Hodder & Stoughton (for whom he published Thomas Keneally's Schindler's Ark in 1982) until 1992 and Orion Publishing Group to 2006. He was said to have "an unmatched reputation as a publisher of taste and acumen".[1]
He was director of the Man Booker Prize for a decade and was the biographer of the politician Alan Clark.[1][2][3][4][5] Trewin also edited the three volumes of Clark's diaries.