# 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
* Comite d'action socialiste - Socialist Action Committee, a French Resistance network

## 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
* Childhood apraxia of speech, a developmental speech disorder

## 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
* County Antrim Shield, football tournament in Northern Ireland
* Creativity, activity, service, the community service aspect of the International Baccalaureate Diploma Programme