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: ** 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 ''Esox'' is a genus of freshwater fish commonly known as pike or pickerel. It is the type genus of the family (biology), family Esocidae. The type species of the genus is ''Esox lucius'', the northern pike. ''Esox'' have a fossil record exten ...

'' (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 Jack pine (''Pinus banksiana''), also known as grey pine or scrub pine, is a North American pine. Distribution and habitat Its native range in Canada is east of the Rocky Mountains from the Mackenzie River in the Northwest Territories t ...

(''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 * ''Jack'' (2025 film), an Indian 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'' (Daudet novel), an 1876 novel by Alphonse Daudet * ''Jack'' (Lundell novel), a 1976 novel by Ulf Lundell * ''Jack'' (Homes novel), a 1990 novel by A. M. Homes * ''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 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 * "Jack" (2023), a song by Hardy from '' The Mockingbird & the Crow'' * "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., ** 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, 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