Black Jack is the nickname of the following people:
John Vernou Bouvier III (1891–1957), father of Jacqueline Kennedy OnassisJack Blackham (1854–1932), Australian cricketerJack Brabham (born 1926), Australian motor racing world championJack Burdock (1852–1932), American Major League Baseball player and managerBlack Jack Christian (1856?–1897), American western outlawJohn Davidson (general) (1825–1881), American Civil War Union Army brigadier general and Indian fighterFrederick Galleghan (1897–1971), Australian Army major generalTom Ketchum (1863–1901), American western outlawJohn A. Logan (1826–1886), American Civil War general and politicianJohn McCauley (1899–1989), senior commander in the Royal Australian Air Force (RAAF)Jack McDowell (born 1966), American Major League Baseball pitcherJohn McEwen (1900–1980), 18th Prime Minister of AustraliaJohn J. Pershing (1860–1948), United States Army generalJean Schramme (1929–1988), Belgian mercenary and planterJack Stewart (ice hockey) (1917–1983), Canadian National Hockey League player