CSL may stand for:

• Canada Steamship Lines Inc., a Canadian shipping company
• Central Science Laboratory, a laboratory services agency of the UK Department of Environment, Food and Rural Affairs
• Chinese Super League, the premier league of football (soccer) in the People's Republic of China
• Chip Support Library
• Coincidence site lattice, a misorientation in the structure of a material
• Commonwealth Serum Laboratories (1916-1961), Australian government agency; since privatised to form CSL Limited, an Australian biotechnology company
• Computer Science Laboratory, a laboratory of Xerox's research division, Xerox PARC; both the laboratory and the division are best known for essentially creating the modern personal computer graphical user interface (GUI) paradigm
• Computer Servo Lock, a technology Yamaha Electronics employs in its tuners and receivers
• Computer Systems Laboratory, at Stanford University, joint venture between Electrical Engineering and Computer Science in School of Engineering
• Conselho Superior da Luta of Guinea-Bissau
• Context-sensitive language, in mathematics, logic, and computer science, a formal language that can be defined by a context-sensitive grammar
• Coordinated Science Lab, University of Illinois at Urbana-Champaign
• Cosmopolitan Soccer League, a soccer league in the New York City area
• Coupé Sport Lightweight, a high-performance version of the sports car BMW M3
• CSL, a mobile phone company in Hong Kong
• Computerized Speech Lab
• C. S. Lewis, an Irish author and scholar of mixed Irish, English, and Welsh ancestry
• CSL, the bulletin of the New York C. S. Lewis Society

CSL | CSL