John Fitzgerald
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)
UK
- Sir 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 (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 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
Others
- John Fitzgerald (priest) (fl. 1627–1641), 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 S. Fitzgerald, frontiersman and erstwhile companion to Hugh Glass