| CAA | Component Application Architecture | In English | → Software |
| CAA | Computational Aeroacoustics | In English | → Computer-based techniques → Aerodynamics → Acoustics |
| CAAB | Canadian Association of Animal Breeders | In English | → Associations |
| CAALIS | Computer-Aided Assembly-Line Inspection System | In English | → Computer-based techniques |
| CAAML | Canadian Avalanche Association Markup Language | In English | → Software → Earth sciences |
| CAAO | Connecticut Association of Assessing Officers (www.caao.com) | In English | → Associations → 332 |
| CAAS | Centre for Arabic and African Studies | In English | → Language, linguistics, literature → Geography, biography, history |
| CAAT | Computer-Aided Assembly Tool | In English | → Computer-based techniques |
| CAAT | (Johns Hopkins) Center for Alternatives to Animal Testing (http://caat.jhsph.edu) | In English | → Organizations and associations → Medicine |
| CAB | Complement Activation Blocker | In English | → Biochemistry, biophysics → Immunology and allergy |
| CAB | Civil Aeronautics Board | In English | → Aeronautics, aircraft |
| CAB | Civil Aviation Board | In English | → Aeronautics, aircraft → Transport and postal services |
| CAB | Computer Address Bus | In English | → Computer science |
| CAB | Corrective Action Board | In English | |
| CAB | Cost Audit Board | In English | → Prices |
| CAB | Congregation of Alexian Brothers | In English | → Roman catholic church |
| CABRI | Common Access to Biological Resources and Information (www.cabri.org) | In English | → Biological sciences |
| CAC | Codex Alimentarius Commission = CAC | Comisión del Codex Alimentarius | In Spanish = CAC | Commission du Codex Alimentarius | In French = CAC | Comissão do Codex Alimentarius | In Portuguese |
In English | → Beverage industry → Food technology |
| CACB | Center Aisle Connector Bracket | In English | |
| CACED | Central American Commission on Environment and Development = CCAD | Comisión Centroamericana de Ambiente y Desarrollo | In Spanish = CCAD | Comissão Centro-americana de Ambiente e Desenvolvimento | In Portuguese |
In English | → International relations → Development |
| CACEU | Central African Customs and Economic Union | In English | → International economic cooperation |
| CACI | Central Asia-Caucasus Institute | In English | → Language, linguistics, literature → Geography, biography, history |
| CACM | Central American Common Market | In English | → International economic cooperation |
| CACT | Campaign Against Child Trafficking | In English | → Organizations and associations → Slavery → Fundamental rights |
| CAD | Computer-Aided Design | In English | → Computer-based techniques |
| CAD | (The) Chicago Assyrian Dictionary | In English | → Dictionaries → Language, linguistics, literature → Geography, biography, history |
| CAD | Computer-Aided Detection | In English | → Diagnostics → Computer-based techniques |
| CADAM | Computer Graphics Augmented Design and Manufacturing | In English | → Computer simulation |
| CADAM | Computer Augmented Design And Manufacturing | In English | → Computer-based techniques → Engineering, technology |
| CADDS | Computer-Aided Design and Drafting System | In English | → Computer simulation |
| CADE | Controller/Attitude Direct Electronics | In English | → Electronics → Spaceflight engineering, astronautics |
| CADE | Canadian Association for Distance Education | In English | → Associations → Education |
| CADFISS | Computation And Data Flow Integrated Subsystem | In English | |
| CADH | Communications and Data Handling | In English | → Data → Telecommunications |
| CADOPS | Computer-Aided Design costing for Operations | In English | → Computer-based techniques |
| CADS | Command And Data Simulator | In English | |
| CADS | Computer-Aided Design System | In English | → Computer-based techniques |
| CADSES | Credit Guarantee Organisation Network | In English | → Finance |
| CADSES | Central European Adriatic Danubian South-eastern European Space | In English | |
| CADSI | Communication And Data Systems Integration | In English | |
| CADU | Control And Display Unit | In English | → Human-computer interaction |
| CAE | Computer-Aided Engineering | In English | → Computer-based techniques → Engineering, technology |
| CAE | Corrective Action Engineer | In English | |
| CAE | Computer Aided Engineering | In English | → Computer-based techniques → Engineering, technology |
| CAE | Centre for Alternative Energy | In English | → Energy economics |
| CAEC | Council for Asia Europe Cooperation | In English | → International relations |
| CAEMC | Central Africa Economic and Monetary Community | In English | → International economic cooperation |
| CAF | Conductive Anodic Filamentation | In English | → Electronics |
| CAFB | Chanute Air Force Base | In English | → 358 |
| CAFE | Clean Air for Europe | In English | → Nature and society → European Union |
| CaGeJ | Canadian Geotechnical Journal | In English | → Serial publications, periodicals → Earth sciences → Civil engineering |
| CAH | Conference on Asian History | In English | → Organizations and associations → History |
| CAH | Cambridge Ancient History | In English | → Serial publications, periodicals → History |
| CAHV | Croatian Association for Heraldry and Vexillology = RTGC | Radio-televizija Crne Gore | In Serbian = RTGC | Радио Телевизија Црне Горе | In Serbian = HDZG | Hrvatsko Društvo za Zastave i Grbove | In Croatian |
In English | → Associations → 9299 |
| CAI | Computer-Aided Instruction | In English | → Computer-based techniques → Education |
| CAIS | Centre for Arab and Islamic Studies | In English | → Islam → Language, linguistics, literature → Geography, biography, history |
| CAIS | Circle of Ancient Iranian Studies | In English | → Language, linguistics, literature → Geography, biography, history |
| CAIT | Computer-Aided Instruction Terminal | In English | → Computer-based techniques → Education |
| CAIT | Computer-Aided Instruction Trainer | In English | → Computer-based techniques → Education |
| CAJ | China Academic Journals | In English | → Serial publications, periodicals |
| CAJ | Central Asiatic Journal | In English | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| CaJCE | Canadian Journal of Civil Engineering | In English | → Serial publications, periodicals → Civil engineering |
| CaJCh | Canadian Journal of Chemistry | In English | → Serial publications, periodicals → Chemical technology → Chemistry |
| CaJES | Canadian Journal of Earth Sciences | In English | → Serial publications, periodicals → Earth sciences |
| CaJPh | Canadian Journal of Physics | In English | → Serial publications, periodicals → Physics |
| CaJRS | Canadian Journal of Remote Sensing | In English | → Serial publications, periodicals |
| CaJSS | Canadian Journal of Soil Science | In English | → Serial publications, periodicals → Earth sciences |
| CAJV | Central Accounting Journal Voucher = PJCC | Pièce de Journal de la Comptabilité Centrale | In French |
In English | → Accounting |
| CAJV | Clough Aker Joint Venture | In English | |
| CAJV | Community Acquisition Joint Venture | In English | → Economics |
| CAJV | Clough-AMEC Joint Venture | In English | → Energy economics |
| CAL | Cocoa Association of London | In English | → Associations → Food technology |
| CAL | Cornell Aeronautical Laboratory | In English | → Research institutes → Aeronautics, aircraft |
| CAL | Contract Advice Letter | In English | → 3474 |
| CAL | Computer-Aided Logistics | In English | → Computer-based techniques → 00393 |
| CAL | Canister Airlock | In English | |
| CAL | Center for Applied Linguistics (www.cal.org) | In English | → Libraries → Education → Language, linguistics, literature |
| CALAS | Canadian Association for Laboratory Animal Science (www.calas-acsal.org) | In English | → Associations |
| CALES | Centre for Arabic Language and Eastern Studies | In English | → Language, linguistics, literature → Area studies |
| CALICO | Computer Assisted Language Instruction Consortium (www.calico.org) | In English | → Organizations and associations → Computer-based techniques → Education → Language, linguistics, literature |
| CALL | Canadian Association of Law Libraries (www.callacbd.ca) = ACBD | Association Canadienne des Bibliothèques de Droit | In French |
In English | → Associations → Libraries → Law, jurisprudence |
| CALPER | Center for Advanced Language Proficiency Education and Research (http://calper.la.psu.edu) | In English | → Organizations and associations → Education → Language, linguistics, literature |
| CALS | Computer-Aided Logistics System | In English | → Maintenance and logistics |
| CALS | Computer-Aided Acquisition and Logistics Support | In English | → Computer-based techniques → Maintenance and logistics |
| CALS | Continuous Acquisition and Lifecycle Support | In English | |
| CALST | Cornell Aeronautical Laboratory Shock Tunnel | In English | → Research institutes → Aeronautics, aircraft |
| CAM | Cost Account Manager | In English | → Prices |
| CAM | Content-Addressable Memory | In English | → Memories |
| CAM | Computer-Aided Manufacturing | In English | → Computer-based techniques |
| CAM | Computer Annunciation Matrix | In English | |
| CAM | Civil Aeronautics Manual | In English | → Aeronautics, aircraft |
| CAM | Carrier Aircraft Modification | In English | → Aeronautics, aircraft |
| CAMCA | Commercial Arbitration and Mediation Centre for the Americas = CAMCA | Centro de Arbitraje y Mediación Comercial para las Américas | In Spanish = CAMCA | Centre d'Arbitrage et de Médiation Commerciale pour les Amériques | In French = CAMCA | Centro de Arbitragem e Mediação Comercial para as Américas | In Portuguese |
In English | → Civil law → Trade |
| CAMEL | Customized Applications for Mobile networks Enhanced Logic | In English | → Networks, communication → Telecommunications |
| CAMERA | Control And Monitoring Equipment Resource Allocation | In English | |
| CAMET | Council of Atlantic Ministers of Education and Training (http://camet-camef.ca) = CAMEF | Conseil Atlantique des Ministres de l’Éducation et de la Formation | In French |
In English | → Organizations and associations → Education |
| CAMET | Central American Metrology Cooperation | In English | → International relations → Meteorology, climatology |
| CAMP | Computational and Applied Mathematical Physics | In English | → Serial publications, periodicals → Mathematics → Physics |
| CAMP | Computer-Aided Message Processing | In English | → Software |
| CAMP | Common Ada Missile Package | In English | → Military engineering |
| CAMP-USA | Council on America's Military Past-USA | In English | |
| CAMR | Canada's Access to Medicines Regime = RAMC | Régime Canadien d'Accès aux Médicaments | In French |
In English | → Pharmacology, toxicology |
| CAMR | Colin Archer Memorial Race (www.camr.nl) | In English | → Sport, physical exercises |
| CAMR | Clean Air Mercury Rule | In English | → Environmental technology, water supply, waste management |
| CAMR | Coalition for the Advancement of Medical Research (www.stemcellfunding.org) | In English | → Organizations and associations → Biotechnology → Medicine |
| CamRe | Cambridge Observatories Reprints | In English | → Serial publications, periodicals → Astronomy |
| CaMV | Cauliflower Mosaic Virus | In English | → Virology → Agricultural sciences |
| CAN | Certification Analysis Network | In English | |
| CAN | Canadian Arthritis Network (www.arthritisnetwork.ca) | In English | → Organizations and associations → Pathology |
| CANDU | CANada Deuterium Uranium | In English | → Nuclear technology |
| CANIS | Community Architectures for Network Information Systems | In English | → Networks, communication |
| CANM | Communications in Applied Numerical Methods | In English | → Serial publications, periodicals → Mathematics |
| CANMES | Canadian Committee of the Middle East Studies Association | In English | → Language, linguistics, literature → Geography, biography, history |
| CAO | Cost Administration Office | In English | → Prices |
| CAOG | Central Assoication of Obstetricians and Gynecologists | In English | → Organizations and associations → Obstetrics |
| CAOG | Centre for Applied Organic Geochemistry | In English | → Organizations and associations → Geochemistry |
| CAORC | Council of American Overseas Research Centers | In English | → Research policy → Organizations and associations |
| CAP | Current Applied Physics | In English | → Serial publications, periodicals → Physics |
| CAP | Crew Activity Plan | In English | |
| CAP | Cost Account Plan | In English | → Prices |
| CAP | Cost Account Package | In English | → Prices → Accounting |
| CAP | Contractor-Acquired Property | In English | → 3474 |
| CAP | Computer Application Program | In English | → Software |
| CAP | Capability Assurance Program | In English | |
| CAP | College of Alberta Psychologists | In English | → Organizations and associations → Psychology |
| CAP | Canadian Association of Palynologists | In English | → Associations → Paleobotany, palynology |
| CAP | Committee on Academic Performance | In English | → Education |
| CAPART | Council for the Advancement of People's Action & Rural Technology | In English | → Organizations and associations → Agricultural sciences |
| CAPAS | Center for Asia Pacific Area Studies | In English | → Area studies |
| CAPI | Council of Asian Press Institutes | In English | → Organizations and associations → Newspapers, journalism |
| CAPI | Centre for Asia-Pacific Initiatives | In English | → Area studies |
| CAPlus | Chemical Abstracts Plus (www.cas.org) | In English | → Chemistry |
| CapMi | Royal Observatory Cape Mimeogram | In English | → Serial publications, periodicals → Astronomy |
| CAPP | Computer-Aided Process Planning | In English | → Management → Computer-based techniques |
| CAPRI | Capacitance Rate Integrator | In English | |
| CAPRI | Confidentiality and Privacy Group | In English | → Organizations and associations → Sociology |
| CAPRN | Canada-Asia-Pacific Research Network | In English | → Research policy → 96 |
| CAPS | Center for Asian and Pacific Studies | In English | → Language, linguistics, literature → Geography, biography, history |
| CAPS | Common Attitude Pointing System | In English | → Spaceflight engineering, astronautics |
| CAPS | Crew Activity Planning System | In English | |
| CAPS | Crew Altitude Protection Suit | In English | |
| CAPS | Crew Altitude Protection System | In English | |
| CAPS | Catastrophic Antiphospholipid Syndrome | In English | → Physiology → Pathology |
| CAPSS | Computer-Aided Planning and Scheduling System | In English | |
| CAPSTRANS | Centre for Asia Pacific Social Transformation Studies | In English | → Social sciences → Area studies |
| CAPTCHA | Completely Automated Public Turing Test to Tell Computers and Humans Apart | In English | → Artificial intelligence |
| CAPWIP | Center for Asia Pacific Women in Politics | In English | → Politics → Feminism |
| CAR | Certification Analysis Requirements | In English | |
| CAR | Certification Approval Request | In English | |
| CAR | Configuration and Acceptance Review | In English | |
| CAR | Contractual Action Request | In English | → 3474 |
| CAR | Corrective Action Record/Report | In English | |
| CAR | Corrective Action Request | In English | |
| CAR | Customer Acceptance Review | In English | |
| CARA | Central Alpine Research Audits | In English | |
| CARB | Central Acquisition Review Board | In English | |
| CARDE | Canadian Armament Research and Development Establishment | In English | → Military engineering |
| CARETAKER | Content Analysis and REtrieval Technologies to Apply Knowledge Extraction to massive Recording | In English | → Computer-based techniques → Knowledge management |
| CARFITA | Caribbean Free Trade Association | In English | → International economic cooperation |
| CARI | Central Asia Research Initiative | In English | → Research policy |
| CARIBCAN | Caribbean-Canada Preferential Trading Arrangement | In English | → International economic cooperation |
| CARID | Customer Acceptance Report/Report Item Disposition | In English | |
| CARID | Customer Acceptance Review Item Disposition | In English | |
| CARIMET | Caribbean Metrology Cooperation = CARIMET | Coopération Caribéenne de Métrologie | In French = CARIMET | Cooperação Caribenha de Metrologia | In Portuguese |
In English | → International relations → Standardization |
| CARLA | Center for Advanced Research on Language Acquisition (www.carla.umn.edu) | In English | → Organizations and associations → Education → Language, linguistics, literature |
| CARM | Customer Accommodation Requirement Model | In English | |
| CARMA | Cared for the Aged at Risk of Marginalisation | In English | → Personal health and hygiene → Public health and hygiene → 3626 |
| CARN | Central Asia Research Network | In English | → Research policy |
| CarOB | Carter Observatory Wellington New Zealand Astronomical Bulletins | In English | → Serial publications, periodicals → Astronomy |
| CarR | Caries Research | In English | → Serial publications, periodicals → Medicine |
| CARR | Customer Accommodation Requirement Representative | In English | |
| CARR | Customer Acceptance Readiness Review | In English | |
| CARRE | Central Asia Research and Remediation Exchange | In English | → Research policy |
| CarRe | Carter Observatory Wellington New Zealand Reprints | In English | → Serial publications, periodicals → Astronomy |
| CarRv | Catalysis Reviews | In English | → Serial publications, periodicals → Chemistry |
| CARS | Configuration Accounting and Reporting System | In English | |
| CAS | Configuration Accounting System | In English | |
| CAS | Cooperative Application Satellite | In English | → Spaceflight engineering, astronautics |
| CAS | Command Augmentation System | In English | |
| CAS | Computer Airspeed | In English | |
| CAS | Crew Accommodation System | In English | |
| CAS | CITE Augmentation System | In English | |
| CAS | Calibrated Airspeed | In English | |
| CAS | Cost Accounting Standard | In English | → Prices → Accounting |
| CAS | Center for Asian Studies | In English | → Language, linguistics, literature → Geography, biography, history |
| CAS | Chemical Abstract Service | In English | → Chemistry → Chemical technology |
| CAS | Content Addressed Storage | In English | → Hardware → Knowledge management |
| CAS | Common Access System | In English | → Computer science |
| CAS | Cambridge Astrophysics Series | In English | → Serial publications, periodicals → Astronomy |
| CASA | Centre for Asian Studies Amsterdam | In English | → Language, linguistics, literature → Geography, biography, history |
| CASA | Canadian Asian Studies Association | In English | → Associations → Language, linguistics, literature → Geography, biography, history |
| CASB | Cost Accounting Standards Board | In English | → Standardization → Prices → Accounting |
| CASE | Computer-Aided System Engineering | In English | → Computer-based techniques → Engineering, technology |
| CASE | Care Application Service Element | In English | |
| CASE | Computer-Automated Software Engineering | In English | → Software |
| CASE | Conformity Assessment Systems Evaluation | In English | → Quality management |
| CASE | Computer Aided Software Engineering | In English | → Software → Computer-based techniques |
| CASES | Control And Structures Experiments for Space | In English | |
| CASJ | Canadian Aeronautics and Space Journal | In English | → Serial publications, periodicals → Astronomy → Spaceflight engineering, astronautics → 6297 |
| CASJQ | Canadian Aeronautics and Space Journal Quarter | In English | → Serial publications, periodicals → Astronomy → Spaceflight engineering, astronautics → 6297 |
|