| Acronym | Definition |
|---|
| CAS | Collision Avoidance System |
| CAS | Close Air Support |
| CAS | Chemical Abstracts Service (division of the American Chemical Society) |
| CAS | Compare and Swap |
| CAS | Communication Arts and Sciences (college courses) |
| CAS | Court of Arbitration for Sport |
| CAS | Casualty Actuarial Society |
| CAS | Create-A-Sim (EA Games; The Sims) |
| CAS | Computer Algebra System (mathematical computation software) |
| CAS | Computer Assisted Surgery |
| CAS | Cowboy Action Shooting |
| CAS | California Academy of Sciences (Golden Gate Park, San Francisco, California) |
| CAS | Creativity, Action and Service (International Baccalaureate Diploma) |
| CAS | Content Addressed Storage |
| CAS | Complex Adaptive Systems |
| CAS | Conditional Access System |
| CAS | Casualty |
| CAS | Contract Administration Services |
| CAS | Cost Accounting Standard |
| CAS | Country Assistance Strategy |
| CAS | Centre d'Analyse Stratégique (French: Strategic Analysis Center) |
| CAS | Complex Adaptive System |
| CAS | Content Addressable Storage |
| CAS | Canadian Anesthesiologists' Society |
| CAS | Computer-Aided Selling |
| CAS | Calibrated Air Speed |
| CAS | Course Applicability System (colleges) |
| CAS | Canadian AIDS Society |
| CAS | Condition Assessment Scheme (ships) |
| CAS | Computer-Aided Software |
| CAS | Czech Academy of Sciences |
| CAS | Consenting Adults |
| CAS | Cost Accounting System |
| CAS | Central Accounting System |
| CAS | Controlled Airspace |
| CAS | Case Assignment |
| CAS | Communicating Applications Specification |
| CAS | Carotid Artery Stent |
| CAS | IEEE Circuits and Systems Society |
| CAS | Commission for Atmospheric Sciences (WMO) |
| CAS | Customer Account Services |
| CAS | Commercially Available Software |
| CAS | Column Address Select |
| CAS | Center for Atmospheric Sciences |
| CAS | Conseil d'Analyse de la Société (French: Society Analysis Council) |
| CAS | Community Action Service (International Baccalaureate high school program requirement) |
| CAS | Crew Alerting System |
| CAS | Connecticut Association of Schools |
| CAS | Call Accounting System |
| CAS | Current Account Surplus |
| CAS | Comité d'Action Sociale (French: Social Action Committee) |
| CAS | Continental Automotive Systems |
| CAS | Computer-Aided Styling |
| CAS | Casine (cell plating) |
| CAS | Centre of Excellence for Autonomous Systems (Australia) |
| CAS | Complete Active Space (quantum chemistry) |
| CAS | Cultures Anglo-Saxonnes (French: Anglo-Saxon Culture) |
| CAS | Crank Angle Sensor |
| CAS | Computer and Systems Engineering (Sprint) |
| CAS | Clinical Ayurvedic Specialist |
| CAS | Control Augmentation System |
| CAS | Computer-Assisted System |
| CAS | CPE Alerting Signal (caller ID with call waiting) |
| CAS | Central Alarm Station |
| CAS | Computational AeroSciences (NASA project) |
| CAS | Condition Assessment Survey |
| CAS | Covenant Aviation Security |
| CAS | Contemporary Arts Society |
| CAS | Crash Analysis System (Land Transport New Zealand) |
| CAS | Centrale Archief Selectiedienst |
| CAS | Certified Anti-Terrorism Specialist (Anti Terrorism Accreditation Board) |
| CAS | Computer-Aided Training |
| CAS | Consejo Asesor de Seguridad (Guatemala) |
| CAS | Contract Administrative Services |
| CAS | Computer Anwendungs- und Systemberatung GmbH |
| CAS | Career Advancement Scheme (Indian universities) |
| CAS | Cycad Aulacaspis Scale |
| CAS | Centre Automatique et Systèmes (French: Systems and Control Center; Mines Paris Tech; Paris, France) |
| CAS | Computerized Autodial System |
| CAS | Controlled American Source |
| CAS | Center for Automotive Safety |
| CAS | Control Actuation System |
| CAS | Center on an Aging Society |
| CAS | Casablanca, Morocco ANFA Airport (city/airport code) |
| CAS | Spotted Wolffish (FAO fish species code) |
| CAS | Computer-Aided Support |
| CAS | Chief Administrative Services |
| CAS | Crisis Action System |
| CAS | Column Address Signal (computer memory) |
| CAS | Computed Air Speed |
| CAS | Combined Antenna System |
| CAS | California Avocado Society |
| CAS | Command Augmentation System (NASA) |
| CAS | Coconino Astronomical Society (Flagstaff, AZ) |
| CAS | Criticality Alarm System |
| CAS | Centre for Adaptive Systems |
| CAS | Craft Access System |
| CAS | Configuration Assurance Solution (Cisco) |
| CAS | Casablanca, Anfa Morocco (airport code) |
| CAS | Collaboration At Sea (US Navy SPAWAR) |
| CAS | Certificate of Applied Science (degree) |
| CAS | Chemical Abstracts Registry Service |
| CAS | Currency Adjustment Surcharge |
| CAS | Calibrated Ancillary System |
| CAS | Cold Air Standard |
| CAS | Canadian Aerophilatelic Society |
| CAS | Computer Assurance Services |
| CAS | Communications Accounting System (Highland Lakes) |
| CAS | Colisée Audiovisuel Services (French: Colosseum Audiovisual Services) |
| CAS | Comité d'Action pour le Solaire (French: Solar Action Comittee) |
| CAS | Calorimetric Absorption Spectroscopy |
| CAS | Chromosome Aberration Simulator |
| CAS | Corporate Administrative System (Canada) |
| CAS | Conflict Alert System |
| CAS | Calculated Air Speed |
| CAS | Chambre Syndicale des Améliorants Organiques et Supports de Culture (French: Union Chamber of Organic Improvement and Media Arts; trade association) |
| CAS | College of Analytical Studies (US Federal Bureau of Investigation) |
| CAS | Command Automation System |
| CAS | Credit Approval Sheet (banking) |
| CAS | Call Accounting Subsystem |
| CAS | Computing in Atmospheric Sciences Workshop |
| CAS | Computer As Source |
| CAS | Cargo Airport Services USA, LLC (Jamaica, NY) |
| CAS | Combat Arms School (Canadian Forces; now defunct) |
| CAS | Centre for Animal Sciences |
| CAS | Customer Access Services |
| CAS | Catch Assessment System (fisheries) |
| CAS | Capable, Available and Suitable |
| CAS | Call-waiting Alerting Signal |
| CAS | Component Administration System |
| CAS | Channel Assigned Signaling (Hekimian) |
| CAS | Cabin Attendant Seat |
| CAS | Contract Analysis System |
| CAS | Controlled ATM Switch (Cisco) |
| CAS | Current Assessment Summary |
| CAS | Customer Alert Signal |
| CAS | Customer Analysis and Solutions (Sterling Wentworth) |
| CAS | Conformal-Array Seeker |
| CAS | Content Adaptation Service |
| CAS | Citizen Auto Stage Company (Nogales, AZ) |
| CAS | Contract Administration Standards |
| CAS | Coordinator of Army Studies |
| CAS | Chemical Association Service |
| CAS | Contract Air Services |
| CAS | Cranial Abscessation Syndrome (deer disease) |
| CAS | COSTAR Alignment System |
| CAS | Computer-Aided Service, Inc. |
| CAS | Commission Accounting System |
| CAS | Customer Access Server |
| CAS | Component Anesthesia Systems |
| CAS | Coordinated Air Strike |
| CAS | Consolidated Application System |
| CAS | Center for Advanced Studies in Telecommunications (Ohio State University) |
| CAS | Containment Assessment Plan |
| CAS | Cam Actuated Switch |
| CAS | Customer Ancillary Service |
| CAS | Central Administration Support |
| CAS | Combined Anode Stirrer |
| CAS | Consultant and Affiliate Services |
| CAS | Consolidated Administration System |
| CAS | Carrier Accounting System (Sprint) |
| CAS | Customer Acceptance Specification |
| CAS | Combat Applications Squadron |
| CAS | Common Aircraft Servicing |
| CAS | Canards Actuator System (Army, artillery) |
| CAS | Czech Athletic Association |
| CAS | Control Alarm Station |
| CAS | Creatively Agonizing Students |
| CAS | Conformal Antenna System |
| CAS | Central Attendant Service |
| CAS | Consultant Accreditation Service |
| CAS | Claims Auto Specialist |
| CAS | Commercial Activities System |
| CAS | Cardinal Air Services Inc (Fullerton Airport, Orange County California) |
| CAS | Construction Area Sign |
| CAS | Contingency Alerting System |
| CAS | Club Aquariophile Scrofulien (French: Scrofulien Aquarium Club) |
| CAS | Comité Andino de Servicio (Spanish: Andean Service Committee) |
| CAS | Chemistry and Analytical Sciences (various institutions) |
| CAS | College Alcohol Study |
| CAS | Cambridge Antiquarian Society (est. 1840) |
| CAS | Cloud Appreciation Society |
| CAS | Center for American Studies (various locations) |
| CAS | Clark Ashton Smith (American author) |
| CAS | Comparative American Studies |
| CAS | Civil Agencies Sector |
| CAS | Clean Air Solvent |
| CAS | Central Alarm System |
| CAS | Capital Advisory Services (various locations) |
| CAS | Childcare Approval Scheme (UK) |
| CAS | Certified Apartment Supplier |
| CAS | Content-and-Structure (computing) |
| CAS | Combat Air Support |
| CAS | Chief of Air Staff |
| CAS | Corporate Advisory Service |
| CAS | Classic Arts Showcase |
| CAS | Column Access Strobe |
| CAS | Certified Addiction Specialist (American Academy of Health Care Providers in the Addictive Disorders) |
| CAS | Client Access Service (Microsoft) |
| CAS | Cockpit Avionics System |
| CAS | Column Address Strobe |
| CAS | Combat Ammunition System |
| CAS | Centralized Attendant Service |
| CAS | Centre for Atmospheric Science |
| CAS | Certificate of Advanced Studies |
| CAS | Channel Associated Signaling |
| CAS | Chemical Abstract Service |
| CAS | Chinese Academy of Sciences |
| CAS | Columbia Audubon Society (South Carolina) |
| CAS | Central Asian States |
| CAS | Certified Advertising Specialist |
| CAS | Census Area Statistic (UK) |
| CAS | Community Adult School (California) |
| CAS | Central Authentication Service (Yale University and JA-SIG) |
| CAS | Charles Armstrong School (Belmont, CA) |
| CAS | Children's Aid Society |
| CAS | Committee on the Application of Standards (various organizations) |
| CAS | Circuits and Systems Society (IEEE) |
| CAS | Centralized Administrative System |
| CAS | Child and Adolescent Services (various organizations) |
| CAS | Computer Application Software |
| CAS | Clean Air Source |
| CAS | Certified Annuity Specialist |
| CAS | Code Access Security (Microsoft .NET Framework) |
| CAS | Caithness and Sutherland (UK) |
| CAS | Conservation Agreement and Strategy (various organizations) |
| CAS | Conciliation and Arbitration Service (various locations) |
| CAS | Cuir Auto Shop (France) |
| CAS | civil aviation security (US DoD) |
| CAS | College of Arts and Sciences (various colleges and universities) |
| CAS | County Animal Shelter (various locations) |
| CAS | Centre for Astrophysics and Supercomputing (Australia) |
| CAS | College of Applied Sciences |
| CAS | Civic Amenity Site (recycling; various locations) |
| CAS | China Association for Standardization (est. 1978) |