John or Jack Fitzgerald, or variants, may refer to:
Military Sir John Forster FitzGerald (1785–1877), Irish soldier, officer in British Army during the Napoleonic wars and Liberal MP John Fitzgerald (soldier) (1817–?), American soldier John Fitzgerald (Medal of Honor) (1873–1948), American Medal of Honor recipient
Nobility John FitzGerald, 1st Baron Desmond (died 1261) John FitzGerald, 1st Earl of Kildare (c. 1250–1316), Irish nobleman John FitzGerald, 4th Earl of Desmond (died 1399) John FitzGerald, de facto 12th Earl of Desmond (died 1534) John Fitzedmund Fitzgerald (died 1589), Irish baron John FitzGerald, 18th Earl of Kildare (1661–1707) Lord John FitzGerald (1952–2015), Irish nobleman
Politics and law UK Sir John Fitzgerald (governor) (), Irish soldier and governor of Tangier John FitzGerald, 15th Knight of Kerry (1706–1741), Irish MP for Dingle John Fitzgerald (1775–1852), British MP for Seaford 1826–32 John FitzGerald, Baron FitzGerald (1816–1889), Irish judge and politician Sir John Fitzgerald (brewer) (1857–1930), Lord Mayor of Newcastle upon Tyne, England, 1914–1915 Jack Fitzgerald (socialist) (1873–1929), founding member of the Socialist Party of Great Britain
U.S. John Fitzgerald (Wisconsin politician) (c. 1827–1863), Wisconsin banker and politician John Wesley Fitzgerald (politician, born 1850) (1850–1908), American businessman and politician John C. Fitzgerald (1863–1928), New York politician John F. Fitzgerald (1863–1950), aka "Honey Fitz", mayor of Boston, grandfather and namesake of president John F. Kennedy John J. Fitzgerald (1872–1952), U.S. representative from New York John I. Fitzgerald (1882–1966), American attorney and politician in Massachusetts John Moonan Fitzgerald (1923–2008), U.S. jurist and politician John Warner Fitzgerald (1924–2006), Michigan chief justice John Wesley Fitzgerald (politician, born 1990), Michigan state representative John F. Kennedy, (1917–1963), 35th U.S. President
Other figures in politics and law John Daniel FitzGerald (1862–1922), Australian politician Jack Fitzgerald (Australian politician) (1864–1936), member of the South Australian House of Assembly John FitzGerald of Dromana (died 1662 or 1664), MP for Dungarvan in the Irish Parliament Jack Fitzgerald (Irish politician) (John Fitzgerald, 1914–1994), Irish Labour Party politician Sir John Fitzgerald, 2nd Baronet (c. 1640–1712), Irish Jacobite politician and soldier
Science and medicine John Patrick Fitzgerald (1815–1897), New Zealand doctor, community leader and hospital superintendent John G. FitzGerald (1882–1940), Canadian physician John Fitzgerald (computer scientist) (born 1965), British computer scientist and Chair of Formal Methods Europe
Sports
American football John Fitzgerald (center) (1948–2026), Dallas Cowboys center John Fitzgerald (quarterback) (born 1975), Arena Football League quarterback John Fitzgerald (offensive guard) (), former University of Central Oklahoma lineman
Association football (soccer) Jack Fitzgerald (footballer) (1930–2003), Irish footballer John Fitzgerald (soccer) (born 1968), Canadian soccer player, businessman & corporate lawyer John Fitzgerald (footballer) (born 1984), Irish footballer
Baseball John Fitzgerald (Rochester Broncos pitcher) (1866–1892), pitcher for the 1890 Rochester Broncos John Fitzgerald (Boston Reds pitcher) (1870–1921), pitcher for the 1891 Boston Reds John Fitzgerald (1950s pitcher) (born 1933), pitcher for the 1958 San Francisco Giants John Fitzgerald (catcher) (), Negro league baseball catcher
Other sports John J. Fitz Gerald (1893–1963), American turf racing sportswriter Jack Fitzgerald (cyclist) (1899–1973), Australian cyclist John Fitzgerald (Australian footballer, born 1961), former Geelong player John Fitzgerald (Australian footballer, born 1901) (1901–1987), Fitzroy player John Fitzgerald (tennis) (born 1960), Australian tennis player John Fitzgerald (pentathlete) (born 1948), American modern pentathlete John Fitzgerald (rugby union) (born 1961), Irish rugby union international player Jack Fitzgerald (rugby league) (1925–1965), Australian rugby league player
Others John Fitzgerald (priest) (), dean of Cork John Anster Fitzgerald (1819–1906), English fairy painter and portrait artist John Driscoll Fitz-Gerald (1873–1946), American scholar and philologist John D. Fitzgerald (1906–1988), American author of children's books John Fitzgerald (poet) (1927–2007), English Carmelite priest and philosopher and Welsh-language poet John D. FitzGerald (born 1949), Irish economist and former director of the Economic and Social Research Institute John S. Fitzgerald, frontiersman and erstwhile companion to Hugh Glass
See also Fitzgerald (disambiguation)