CAS

• California Academy of Sciences, a major natural history museum and center for scientific research
• Career Academies of Seminole, a program run by Pinellas County Schools in Florida
• Casablanca American School, a coed private prep school in Casablanca, Morocco
• Casualty Actuarial Society, a professional society of actuaries in the United States
• Centre for Astrophysics and Supercomputing, a research center at Swinburne University in Australia
• Chemical Abstracts Service, a division of the American Chemical Society which produces bibliographic and chemistry databases
• Chinese Academy of Sciences, the national academy for the natural sciences of China
• Combined Associated Schools, an association of private schools in Sydney, Australia
• Contemporary Art Society, UK
• Contemporary Art Society (Australia)
• Contemporary Art Society, Adelaide, later the Contemporary Art Centre of South Australia
• Contemporary Arts Society, Canada
• Court of Arbitration for Sport, an international arbitration body set up to settle disputes related to sports
• Children's Aid Society, a private charity in New York City
• Children's Aid Society (Ontario), a Canadian government organization
• Christchurch Adventist School, a Seventh-day Adventist school in New Zealand
• Civil Aid Service, a Hong Kong Civil Aid agency
• Cinema Audio Society, an association of sound professionals in the motion picture and television industry
• Council for the Advancement of Standards in Higher Education, a consortium of professional student development organizations in higher education
• Connecticut Association of Schools, the governing body for secondary school athletics and other competitions in Connecticut, US
• Czech Academy of Sciences, formerly Academy of Sciences of the Czech Republic
• Český atletický svaz, Czech Athletics Federation
• Comite d'action socialiste - Socialist Action Committee, a French Resistance network

• CAS latency (column address strobe or column address select), a latency in reading computer memory
• Central Authentication Service, a single sign-on protocol
• Cloud Analytic Services, a server that provides the cloud-based, run-time environment for data management and analytics with SAS (software)
• Code Access Security in the Microsoft .NET framework
• Compare-and-swap, a special CPU instruction, an atomic instruction used in multithreading to achieve synchronization
• Computer algebra system, a software program that facilitates symbolic mathematics
• Conditional access system, a technology used in set-top boxes to allow conditional viewing of TV channels
• Content-addressable storage, a data storage mechanism
• Copyright Alert System, also known as the 'six strikes' program
• Cycle-accurate simulator, a computer program that simulates a microarchitecture in a cycle-accurate manner

• Calcium sulfide (CaS), a chemical compound
• Coronary artery spasm (CAS)
• Carotid artery stenting, endovascular surgery of the carotid artery
• Cassiopeia (constellation) (Cas), standard astronomical abbreviation
• Cells Alive System
• Chemical Abstracts Service, a division of the American Chemical Society which produces bibliographic and chemistry databases
• CAS Registry Number, unique numerical identifiers for chemical substances
• Cognitive Assessment System, an academic assessment test given to children
• Complex adaptive system, special cases of complex systems
• Computer Aided Surgery (journal)
• Computer-assisted surgery, use computer technology in surgery
• Critical animal studies, an interdisciplinary field in the humanities and social sciences
• Critical autism studies
• Hartley kernel, which also is known as the cosine and sine function
• Cis-abienol synthase, an enzyme
• CRISPR-associated (Cas) proteins, involved in the prokaryotic immune system and genome editing
• CAS parameters, an image analysis method typically used in astronomy
• Childhood apraxia of speech, a developmental speech disorder

• Calling All Stations, the fifteenth and final studio album by Genesis
• Cigarettes After Sex, an American ambient pop band
• Classic Arts Showcase, an American television channel promoting the fine arts
• Cowboy action shooting, a competitive shooting sport

• Chief of the Air Staff, the professional head of the air force in some Commonwealth nations
• Close air support, a military tactic whereby aircraft are utilized to support friendly forces
• Combat armor suit, a specialized suit that provides powered armor
• Cost Accounting Standards, accounting requirements for larger defense and government contractors (United States)

• Calibrated airspeed, the airspeed shown by an airspeed indicator
• Covenant Aviation Security, LLC, a company that provides security services to the aviation industry
• Crew-alerting system, the cockpit computer that issues system warnings to pilots
• Casablanca–Anfa Airport (IATA code)

• Castleton railway station, Manchester, England (National Rail station code)
• Chicago, Attica and Southern Railroad, a former line in the American states of Indiana and Illinois

• Certificate of Advanced Study, a postgraduate certificate
• Channel-associated signaling, in telecommunications
• Citizens Advice Scotland, the umbrella organisation for Citizens Advice Bureaux in Scotland
• Clark Ashton Smith (1893–1961), American author and artist
• Collision avoidance system, an automobile safety system
• Controlled American source, a placeholder term used by the Central Intelligence Agency in classified documents to avoid disclosure of specific locations, operations, activities, or individuals
• Controlled atmosphere stunning, a method for slaughtering animals
• County Antrim Shield, football tournament in Northern Ireland
• Creativity, activity, service, the community service aspect of the International Baccalaureate Diploma Programme

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• Cas (disambiguation)
• CASE (disambiguation)

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