John C. O'Sullivan (1843 – 1887) was a physician and politician in Ontario, Canada. He represented Peterborough East in the Legislative Assembly of Ontario...

John O'Sullivan may refer to: John O'Sullivan (cricketer) (1918–1991), New Zealand cricketer John O'Sullivan (cyclist) (1933–2023), Australian cyclist...

Sir John William O'Sullivan (c. 1700 – c. 1760) was an Irish professional soldier, who spent most of his career in the service of France, but is best known...

John O'Sullivan, CBE (born 25 April 1942) is a British conservative political commentator and journalist. From 1987 to 1988, he was a senior policy writer...

Maureen Paula O'Sullivan (May 17, 1911 – June 23, 1998) was an Irish actress who played Jane in the Tarzan series of films during the era of Johnny Weissmuller...

Denise Rebecca O'Sullivan (born 4 February 1994) is an Irish professional footballer who plays as a midfielder for and captains the American club North...

John Louis O'Sullivan (November 15, 1813 – March 24, 1895) was an American columnist, editor, and diplomat who coined the term "manifest destiny" in 1845...

Raymond Edward "Gilbert" O'Sullivan (born 1 December 1946) is an Irish singer-songwriter who achieved his most significant success during the early 1970s...

John Anthony James O'Sullivan (born 18 September 1993) is an Irish professional footballer who plays as an attacking midfielder for Shelbourne. In the...

Diarmuid O'Sullivan (born 27 July 1978) is an Irish hurling coach and hurler who plays for Cork Premier Championship club Cloyne. He played for the Cork...