Jack may refer to:

Places

* Jack, Alabama, US, an unincorporated community * Jack, Missouri, US, an unincorporated community *

Jack County, Texas Jack County is a county located in the north central part of the U.S. state of Texas. As of the 2020 census, its population was 8,472. Its county seat is Jacksboro. The county was created in 1856 and organized the next year. It is named for ...

, a county in Texas, USA

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

Animals and plants

Fish

*Carangidae generally, including: **Almaco jack **Amberjack **Bar jack **Black jack (fish) **Crevalle jack **Giant trevally or ronin jack **Jack mackerel **Leather jack **Yellow jack *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

Arts, entertainment, and media

Films

* Jack (1996 film), ''Jack'' (1996 film), a film starring Robin Williams * Jack (2004 film), ''Jack'' (2004 film), a film starring Anton Yelchin and Stockard Channing * Jack (2013 film), ''Jack'' (2013 film), a television film starring Rick Roberts and Sook-Yin Lee * Jack (2014 film), ''Jack'' (2014 film), a German film * Jack (2015 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 (game), jacks

Literature

* Jack (Homes novel), ''Jack'' (Homes novel), a 1990 novel by A. M. Homes * Jack (Lundell novel), ''Jack'' (Lundell novel), a 1976 novel by Ulf Lundell * Jack (Robinson novel), ''Jack'' (Robinson novel), a 2020 novel by Marilynne Robinson

Periodicals

* Jack (Italian magazine), ''Jack'' (Italian magazine), an Italian-language technology magazine * Jack (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), ''Jack'' (album), a 2010 studio album by John Farnham * Jack (EP), ''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), "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 (Sham 69 album), ''Kings & Queens'' * "Jack" (1984), a song and single by Bone Orchard * "Jack" (2001), a song by Iced Earth from their album Horror Show (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 (Pixie Lott album), Turn It Up'' (2009) album * "The Jack", a song by AC/DC originally on the album ''T.N.T. (album), T.N.T.'' (1975)

Television

* Jack (TV series), ''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 (hero), an archetypal Cornish and English hero and stock character * Jack FM, a radio format and brand

Military

* Jack (flag), a national maritime flag flown by warships, e.g., **Union Jack * 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#Plug and socket connectors, 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 (mascot), the mascot of Jack in the Box restaurants * Cracker Jack and Cracker Jack'D, snack foods * 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 British Discount supermarket chain * Monterey Jack, a variety of cheese * Sailor, "jack" in obsolete usage * Sailor Jack, he and his dog Bingo are the mascots for Cracker Jack snack food * Yukon Jack (liqueur), a Canadian whisky with honey * Jack Tar, term for a sailor