CK
- .ck
- Bloods
- C-K theory
- CAK (disambiguation)
- CH. Karnchang
- CK (album)
- CK Hutchison Holdings
- Calvin Klein
- Chevrolet C/K
- China Cargo Airlines
- Chowking
- Circle K
- Civilinis kodeksas
- Ck (digraph)
- Collective Knowledge (software)
- Colombo Kings
- Composite Corridor
- Con Kolivas
- Conductive keratoplasty
- Cranbrook Kingswood
- Creatine kinase
- Cyanogen chloride
- Cytokeratin
- Cytokinin
- KC (disambiguation)
- Louis C.K.