Jack the Ripper (19th century), alias given to an unidentified serial killer of Victorian England

Jack, the term for a male donkey

Jack plug, a common audio connector

Spring Heeled Jack (19th century), a legendary figure of Victorian England

A sailor or mariner is a person who navigates water-borne vessels or assists in their operation, maintenance, or service. The term can apply to professional mariners, military personnel, and recreational sailors as well as a plethora of other uses....

Jack FM, a radio format in Canada and the United States

Jack Horner (Fables), the main character of Jack of Fables

the Carangidae family

Jack Daniel's, a brand of whiskey

Jackfruit, a species of tree native to the East Indies

Jack (Tekken), a series of robots in the Tekken series

Jack (name), originally a nickname for John (including list of people with that name)

Jack the Stripper (mid-20th century), nickname given to an unknown serial killer of London, England who stripped victims

Jack (film), a 1996 American film directed by Francis Ford Coppola and starring Robin Williams

the Coho salmon

Jacks, playground game for children

Jack (playing card), the lowest face card in a deck of playing cards

JACK Audio Connection Kit, a computer sound server

Jack (tree), a relative of the mango

Jacking, a form of dance popular in the late 1980s

Jack (device), a device used to lift heavy objects

Jack (Book of Words), a series by J.V. Jones

Jack (connector), an electrical connector

large California rockfish

Jack plane, a tool for smoothing wood

Jack (human modeling), a human modeling and simulation system

Jack (band), a Britpop band

Jack of all trades disambiguation page

Jack-in-the-Box (disambiguation)

Crackerjack (disambiguation)

Jack (mascot), the clown mascot of American restaurant chain Jack In The Box

Jack (webcomic), an online adult furry comic by David Hopkins

freshwater pike, green pike or pickerel

Jack of Fables, an American comic book series