John or Jack Fitzgerald, or variants, may refer to:

• 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

• 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

• John Fitzgerald (governor) ( fl. 1660s), 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 (1873–1929), founding member of the Socialist Party of Great Britain
• Jack Fitzgerald (politician) (John Fitzgerald, 1914–1994), Irish Labour Party politician

• John Fitzgerald (Wisconsin politician) (c. 1827–1863), Wisconsin banker and politician
• John Wesley Fitzgerald (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, Michigan state representative

• John Daniel FitzGerald (1862–1922), Australian politician
• John Fitzgerald (Australian politician) (1864–1936), member of the South Australian House of Assembly
• John FitzGerald of Dromana, MP for Dungarvan in the Irish Parliament

• 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

• John Fitzgerald (center) (born 1948), former Dallas Cowboys center
• John Fitzgerald (quarterback) (born 1975), former quarterback with the af2's Austin Wranglers
• John Fitzgerald (offensive guard) ( fl. 1998–2000), former University of Central Oklahoma lineman

• 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

• 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) ( fl. 1940s), Negro league baseball catcher

• John J. Fitz Gerald (1893–1963), American turf racing sportswriter
• Jack Fitzgerald (cyclist) (born 1899), 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

• John Fitzgerald (priest) ( fl. 1627–1641), Dean of Cork
• John Anster Fitzgerald (died 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 1952), Irish economist and former director of the Economic and Social Research Institute
• John S. Fitzgerald, a frontiersman and erstwhile companion to Hugh Glass

• Fitzgerald (disambiguation)

Topics referred to by the same term

This disambiguation page lists articles about people with the same name.
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