CAS

CAS may refer to:

Organisations

 * 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

Computing

 * 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

Science and medicine

 * 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

Entertainment and sports

 * 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

Military

 * 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)

Aerospace

 * 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)

Transport

 * 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

Other uses

 * 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
 * Creativity, activity, service, the community service aspect of the International Baccalaureate Diploma Programme