John Myles Dillon (/ˈdɪlən/; born 15 September 1939) is an Irish classicist and philosopher who was Regius Professor of Greek in Trinity College, Dublin between 1980 and 2006. Prior to that he taught at the University of California, Berkeley. He was elected a corresponding member of the Academy of Athens on 15 June 2010, and in July 2022 a corresponding member of the British Academy. Dillon's area of research lies in the history of Platonism from the Old Academy to the Renaissance, and also Early Christianity.