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 ==Science and medicine==