Jack could refer to:
- Characters
- Jack the Ripper, a killer in London, England in the late 19th century
- Redjac, a parasitic organism that fed on fear
- Jack (20th century), inhabitant of Carbon Creek, Pennsylvania in the mid-20th century
- Jack (character), a soap opera character in the late 20th century
- Jack (23rd century), an ancestor of Harry Kim in the 23rd century
- Jack Crusher, Beverly Crusher's husband, KIA 2354
- Jack (24th century), the genetically-engineered Human in the 24th century
- Jack London, an author in the late 19th/early 20th centuries
- Jack Palance, a fairly well-known film actor
- Jack Wilson, a character from the movie Shane, played by Jack Palance
- Other references
- Double-jack, a card game
- Jack-in-the-box, a children's toy, or a hidden subroutine in a holodeck program
- Jack Daniel's, a brand of Tennessee whiskey.
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