Jack may refer to:
Places
- Jack, Alabama, US, an unincorporated community
 - Jack, Missouri, US, an unincorporated community
 - Jack County, Texas, a county in Texas
 
People and fictional characters
- Jack (given name), a male given name, including a list of people and fictional characters with the name
 - Jack (surname), including a list of people with the surname
 - Jack (Tekken), multiple fictional characters in the fighting game series Tekken
 - Jack the Ripper, an unidentified British serial killer active in 1888
 - Wolfman Jack (1938–1995), a stage name of American disk jockey Robert Weston Smith
 - New Jack, a stage name of Jerome Young (1963-2021), an American professional wrestler
 - Spring-heeled Jack, a creature in Victorian-era English folklore
 - Jack (hero), an archetypal Cornish and English hero and stock character
 
Animals and plants
Fish
- Carangidae generally, including:
 - Coho salmon, males called "jacks"
 - Esox (northern pike), young called "jacks"
 - "Jackfish" or "jack", a western Canadian name for northern pike
 
Mammals
- Jack (baboon), a baboon who was the assistant to a disabled railway signalman in South Africa
 - Jack (cat), a Norwegian forest cat who was lost by American Airlines baggage handlers
 - Jack or jackass, a male donkey (Equus africanus)
 
Plants
- Jack (tree) (Mangifera caesia), a relative of the mango
 - Jack pine (Pinus banksiana), a North American conifer
 - Jackfruit (Artocarpus heterophyllus)
 
Arts, entertainment, and media
Films
- Jack (1925 film), a French silent film directed by Robert Saidreau
 - Jack (1996 film), a film starring Robin Williams
 - Jack (2004 film), a film starring Anton Yelchin and Stockard Channing
 - Jack (2013 film), a television film starring Rick Roberts and Sook-Yin Lee
 - Jack (2014 film), a German film
 - Jack (2015 film), an Austrian film
 
Games
- Jack (playing card), the lowest-ranking face card in some types of deck
 - Jack, a target ball used in games such as bowls
 - Jack, a playing piece used in the children's game called jacks
 
Literature
- Jack (Homes novel), a 1990 novel by A. M. Homes
 - Jack (Lundell novel), a 1976 novel by Ulf Lundell
 - Jack (Robinson novel), a 2020 novel by Marilynne Robinson
 
Periodicals
- Jack (Italian magazine), an Italian-language technology magazine
 - Jack (magazine), an English-language British lad mag
 
Music
Artists and groups
- Jack (band), a British independent pop group signed to the Too Pure label
 - Jack & Jack, an American an American pop-rap duo
 - Jack (Vietnamese singer) (born 1997), a Vietnamese pop star
 
Albums
- Jack (album), a 2010 studio album by John Farnham
 - Jack (EP), a 1991 EP by Moose
 - Jack, a 1984 album by Bone Orchard
 - J.A.C.K., a 2013 studio album by Forever the Sickest Kids
 
Songs
- "Jack" (song), a 2013 song by Breach
 - "Jack" (1980), a B-side song to "Tell The Children" by Sham 69 on the album Kings & Queens
 - "Jack" (1984), a song and single by Bone Orchard
 - "Jack" (2001), a song by Iced Earth from their album Horror Show (2001)
 - "Jack" (1983), a song and single by Machinations (band)
 - "Jack" (1983), a song and single by Mighty Gabby
 - "Jack", song by Pixie Lott from the Turn It Up (2009) album
 - "The Jack", a song by AC/DC originally on the album T.N.T. (1975)
 
Television
- Jack (TV series), a 3D-animated series broadcast by TVOntario
 - Jack TV, a general entertainment channel in the Philippines (cable)
 
Other uses in arts, entertainment, and media
- Jack FM, a radio format and brand
 
Military
- Jack (flag), a national maritime flag flown by warships, e.g.,
 - Jack, the Allied code-name of the Japanese Mitsubishi J2M fighter of World War II
 
Technology
Computing and software
- Jack (CAD software), a 3-D ergonomics and human factors CAD package
 - Jack (human modeling), a human modeling and simulation system
 - JACK Audio Connection Kit, a computer sound server
 - JACK Intelligent Agents, a multi-agent platform written in Java
 
Electrical interfaces
- Electrical connector, or "wall jack", a socket (often panel-mounted) intended to accept a plug
 - Phone connector (audio), commonly known as "audio jack", or "jack plug", or "phone jack"
 - Registered jack, a standardized telecommunication network interface for connecting voice and data equipment
 
Mechanical tools
- Jack (device), a device used to lift heavy objects
- Jackscrew, a device used to support heavy objects at various heights
 - Pallet jack, a device with two forks used to lift and move pallets; the powered version is known as a forklift
 - Strand jack, used in construction and engineering, and is capable of lifting hundreds of tonnes
 
 - Boot jack, a device for removing boots
 - Jack plane, a tool for smoothing wood
 - Roasting jack, a device for turning a spit
 
Other uses
- Jack Box, the mascot of Jack in the Box restaurants
 - Cracker Jack and Cracker Jack'D, snack foods with the fictional Sailor Jack as a mascot
 - Jack Daniel's, a Tennessee whiskey distillery, whose product is sometimes referred to as "Jack"
 - Jack of plate or jack, a type of armor
 - Jack's (store), a defunct British discount supermarket chain owned by Tesco
 - Monterey Jack, a variety of cheese
 - Quarter-jack or jack, an animated figure which strikes the bell of a clock
 - Yukon Jack (liqueur), a Canadian whisky with honey
 - Jack Tar or "jack", a term for a sailor
 
See also
- All pages with titles beginning with Jack
 - All pages with titles containing Jack
 - Hijacking (disambiguation)
 - Jacking, a dance technique and music form that first became popular in the late 1980s
 - Jacks (disambiguation)
 
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