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Jack
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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 Buckby, former BNP member
- 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
- Union Jack, flag of the United Kingdom