Denis O'Sullivan

Denis O'Sullivan (born 11 March 1948) is an Irish former professional golfer.

Career O'Sullivan won the 1985 Irish Amateur Close and the 1990 Irish Amateur Stroke Play, but did not turn professional until 1997, when he decided to try to qualify for the European Seniors Tour. He came through the European Seniors Tour Qualifying School at his first attempt and became one of the tour's most consistent players. He has won six seniors events and finished in the top ten on the Order of Merit several times, with a best ranking of third in 2000.

Amateur wins 1985 Irish Amateur Close 1990 Irish Amateur Stroke Play

Professional wins (6) European Seniors Tour wins (6) Legend Tour Championships (1) Other European Seniors Tour (5)

European Seniors Tour playoff record (0–1)

Team appearances Amateur European Amateur Team Championship (representing Ireland): 1977

Professional Praia d'El Rey European Cup: 1998 (tie)