• Crack cocaine, a freebased form of cocaine
• Crack, a fracture or discontinuation in a body
• Crack (economics), the value difference between crude oil and oil products or between different oil products, usually expressed as a per-barrel value
• Crack (software), a UNIX/Linux password cracking program for systems administrators
• Crack (Z-Ro album), 2008 album
• Software cracking, the modification of software to remove protection methods
• No-CD crack
• Crack (craic), slang for 'fun', 'joke', 'gossip' and other meanings in Ireland and parts of the UK
• Crack, slang for gluteal cleft
• CRACK, an acronym for 'Children Requiring A Caring Kommunity', now called 'Project Prevention'
• Crack Movement, a Mexican literary movement
• The Crack, first album by The Ruts
• Leftöver Crack, a anarcho-punk band from New York City

See also

• Cracker
• Cracking
• Crac des Chevaliers
• Krak
• KRAK
• CRAC