• Jack (CAD software), a 3-D interactive ergonomics and human factors CAD package

• Jack (connector), an electrical connector

• * TRS connector, also known as a "Jack plug", a common audio connector

• JACK Audio Connection Kit, a computer sound server

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

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

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

• Jack (tree), a relative of the mango

• Jack (film), a 1996 movie starring Robin Williams

• Jack (2004 film), a 2004 movie starring Anton Yelchin and Stockard Channing

• Jack (software), audio CD ripper

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

• Jacks, playground game for children

• Jack is the name of one of the Clayton Windmills, a pair of windmills at Clayton, Sussex.

• Jackass, a male donkey.

Other uses

• Jack Daniel's, a brand of whiskey

• Jack plane, a tool for smoothing wood

• Jack FM, a radio format and brand

• Jackfruit, a species of tree native to the East Indies

• Maritime flag#Jacks, maritime flags flown from the bow of a ship

• Sailors

• Jack (fish), several species of fish

• Jack (webcomic), an anthropomorphic webcomic

See also

• Crackerjack (disambiguation)

• Jack-in-the-Box (disambiguation)

• Jack of all trades

• You Don't Know Jack