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Jack might refer to:
Billy Jack, film series by Tom Laughlin
Jack Abramoff, GOP lobbyist
Jackalope, a cryptid that is actually just a rabbit with cancer
Jack Chick, fundamentalist Christian comic artist
Jack Cuozzo, young-Earth creationist
Jack Daniel's, a well-known brand of whiskey
Jack Donovan, "androphilic" MRA
Jack Dorsey, ex-CEO of ex-Twitter
Jack Houck, creator of the spoon bending party
Jack Hyles, ex-pastor of the First Baptist Church of Hammond, Indiana
Jack Idema, deceased American vigilante and war criminal
Jack Kennedy, assassinated U.S. President
Jack Mormon, a non-practicing cultural Mormon
Jack o' lantern, a carved pumpkin for Halloween
Jack Parsons, rocket scientist and occultist
Jack Posobiec, alt-right troll
Jack the Ripper, infamous London serial killer
Jack Ruby, Lee Harvey Oswald's assassin
Jack Straw, former British Labour MP
Jack Thompson, lawyer who went after video games
Jack Van Impe, televangelist
Spring Heeled Jack, Victorian England urban legend