Jack

Jack could refer to:
;People
*Jack (20th century), inhabitant of Carbon Creek, Pennsylvania in the mid-20th century
*Jack (23rd century), an ancestor of Harry Kim in the 23rd century
*Jack (24th century), the genetically-engineered Human in the 24th century
*Jack (card), the lowest face card in a deck of playing cards
*Jack (character), a soap opera character in the late 20th century
*Jack (name), a name guessed as belonging to Rumpelstiltskin 
*Jack the Ripper, a killer in London, England in the late 19th century
;Other references
*Double-jack, a card game
*Jack Daniels, sometimes shortened to "Jack"
*Jack-in-the-box, a children's toy, or a hidden subroutine in a holodeck program
*Jack of all trades, a handyman
*Jacked, 21st century slang for being robbed
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