Other
See also: C-K theory- Ck (digraph)
- .ck, the Internet country code top-level domain for the Cook Islands
- CK (album), 1998 album by Chaka Khan
- Calvin Klein
- Candidate key
- Chaka Khan (1982 album), Chaka Khan's self-titled album
- Chairman King or Circus King, bosses in Okage video games
- Certified Kinesiologist,
- Chevrolet C/K, car companies Chevrolet and GMC's full-size Pickup truck line from 1960 until 1998
- China Cargo Airlines's IATA code
- Citizen Kane
- Civilinis kodeksas, Code of Lithuania
- Composite Corridor, a designation of British Rail carriage
- Con Kolivas, the Linux Kernel developer
- Conductive keratoplasty
- Core Knowledge, a textbook series
- Corner Kick, a method of restarting play in a game of association football
- Cranbrook Kingswood, a Bloomfield Hills school
- Crusader Kings (video game), a grand strategy game made by Paradox Interactive
- Crip-Killer, a member of the Bloods street gang
- Cyanogen chloride
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