John O'Sullivan may refer to: Sir John O'Sullivan (soldier) (1700–1760), Irish soldier, Quartermaster general to Prince Charles Edward Stewart during the Jacobite Rising of 1745 John L. O'Sullivan (1813–1895), journalist who popularized the phrase "Manifest Destiny" John C. O'Sullivan (1841–?), politician in Ontario, Canada John Francis O'Sullivan (1850–1907), Irish-American awarded the Medal of Honor during the Indian Wars John M. O'Sullivan (1881–1948), Irish Cumann na nGaedhael/Fine Gael politician, TD, cabinet minister and academic John O'Sullivan (Cork politician) (1901–1990), Irish Fine Gael Party politician, Senator, later TD for Cork South-West John O'Sullivan (cricketer) (1918–1991), New Zealand cricketer John O'Sullivan (cyclist) (born 1933), Australian cyclist John O'Sullivan (columnist) (born 1942), British conservative columnist and editor John O'Sullivan (engineer), Australian astronomer and electrical engineer, the inventor of founding technology of Wi-Fi John O'Sullivan (rugby league), New Zealand rugby league footballer John O'Sullivan (rugby union) (born 1980), Irish rugby union footballer John O'Sullivan (footballer) (born 1993), Irish footballer playing for Blackburn Rovers F.C. John O'Sullivan (Illinois politician), member of the Illinois House of Representatives John Lack O'Sullivan (1976–2002), Gaelic footballer and Australian rules footballer