CSL
- BMW CSL
- CAL Spora Luxembourg
- CSL Behring
- CSL Group Ltd
- CSL Limited
- CSL Mobile
- CSL Sofas
- CSL-TV
- Cabo San Lucas
- Calcium stearoyl-2-lactylate
- Canada Steamship Lines
- Canadian Soccer League
- Canadian Soccer League (1987–1992)
- Canadian Socialist League
- Centers for Spiritual Living
- Central Science Laboratory
- Chinese Sign Language
- Chinese Super League
- Citation Style Language
- Clay Sanskrit Library
- Cochin Shipyard Limited
- Context-sensitive language
- Cooperative Security Location
- Coordinated Science Laboratory
- Cosmopolitan Soccer League
- Croatian Sign Language
- Crosshole sonic logging
- Czechoslovak People's Party
- Hartmann's solution
- Liège Space Center
- Wattle-class crane stores lighter