CSK
- C-src tyrosine kinase
- CSK Auto
- CSK Holdings Corporation
- CSK VVS Samara (ice hockey)
- Calstock railway station
- Carmel School (Kuwait)
- Chan Sui Ki (La Salle) College
- Charlottenlund SK
- Chennai Super Kings
- Claremont serial killings
- Color shift keying
- Czechoslovak koruna
- Czechoslovakia
- Kativik Ilisarniliriniq
- List of airline codes (F)
- Order of the Star and Key of the Indian Ocean