John Eudes O'Leary (19 August 1949 – 26 March 2020) was an Irish professional golfer who played on the European Tour through the 1970s and 1980s. In 1976 he won his first European Tour event, the Greater Manchester Open, and in 1982 he became only the third Irishman to win the Irish Open. He played in a number of team competitions, representing Great Britain and Ireland in the 1975 Ryder Cup, and playing for Ireland three times in the World Cup.