| CES | Consumer Electronics Show | In English | → Computer science → Electronics |
| CESA | Canadian Engineering Standards Association | In English | → Standardization → Associations → Engineering, technology |
| CESIA | Centre d'Études des Systèmes d'Information des Administrations | In French | → Computer science → Public administration, government → Telecommunications |
| CESTEL | Centro Español de Servicios Telemáticos (www.cestel.es) | In Spanish | → Computer science → Telecommunications |
| CETELIC | Centre de Traitement Électronique Intercaisses | In French | → Computer-based techniques → Telecommunications |
| CETMA | Centre d'Études sur le Management | In French | → Management |
| CEVA | Content-Enabled Vertical Application | In English | → Software → Document processing |
| CF | Computers and Fluids | In English | → Serial publications, periodicals → Computer science → 532 |
| CFAO | Conception et Fabrication Assistées par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| CFE-CGC | Confédération Française de l'Encadrement - Confédération Générale des Cadres | In French | → Management → Labour, labour economics |
| CFG | Context Free Grammar | In English | → Data → Document processing |
| CFML | ColdFusion Markup Language | In English | → Programming languages |
| CG | Computers and Geosciences | In English | → Serial publications, periodicals → Computer science → Earth sciences |
| CGH | Computergeneriertes Hologramm | In German | → Graphical processing → Optics |
| CGI | Computer Generated Imagery | In English | → Image processing |
| CGI | Common Gateway Interface | In English | → Software → Networks, communication |
| CGIH | Comité de Gestion de l'Informatique Hospitalière | In French | → Computer science → Medicine |
| CGIP | Computer Graphics Image Processing | In English | → Serial publications, periodicals → Computer science |
| CGM | Computer Graphics Metafile | In English | → Data → Graphical processing → Image processing |
| CGMP | Cisco Group Management Protocol | In English | → Networks, communication |
| CGPM | Conférence Générale des Poids et Mesures | In French | → Standardization |
| CGRA | Commission de Gestion de la Recherche et de ses Applications | In French | → Research policy |
| CGTI | Conseil Général des Technologies de l'Information | In French | → Computer science → Telecommunications |
| CHARMS | Canadian Hemophilia Assessment and Resource Management Information System | In English | → Knowledge management → Blood and circulatory system → Pathology |
| CHI | Computer-to-Human Interface | In English | → Human-computer interaction |
| CHI | Computer-Human Interaction = MDI | Människa-datorinteraktion | In Swedish = MMI | Man-Machine Interaction | In English = IHM | Interface Homme-Machine | In French |
In English | → Human-computer interaction |
| CHIP | Children's Hospital Informatics Program | In English | → Software → Pediatry |
| CHIR | Chirurgie, Informatique et Robotique | In French | → Computer science → Surgery, orthopaedics, ophthalmology → Mechanical engineering → Electronics |
| CHL | Certified Hardware List | In English | → Software |
| CHMAC | Coopération Homme-Machine pour l'Assistance à la conduite | In French | → Human-computer interaction → Vehicle engineering → Transport and postal services |
| CHTML | Compact HyperText Markup Language | In English | → Programming languages → Telecommunications |
| CIA | Control Interface Assembly | In English | → Human-computer interaction |
| CIA | Controller Interface Assembly | In English | → Human-computer interaction |
| CIB | Control Interface Block | In English | → Human-computer interaction |
| CIC | Command Interface Control | In English | → Human-computer interaction |
| CIC | Centre International de Calcul (www.unicc.org) = CICE | Centro Internacional de Cálculos Electrónicos | In Spanish = ICC | International Computing Centre | In English = CIC | Centro Internacional de Computação | In Portuguese |
In French | → Computer science → United Nations |
| CIC | Centro Internacional de Computação (www.unicc.org) = CICE, ICC (look above) |
In Portuguese | → Computer science → United Nations |
| CICE | Centro Internacional de Cálculos Electrónicos (www.unicc.org) = CIC, ICC (look above) |
In Spanish | → Computer science → United Nations |
| CICESE | Centro de Investigación Científica y de Educación Superior de Ensenada (www.cicese.mx) | In Spanish | → Research institutes → Research policy → Higher education, universities |
| CICU | Computer Interface Conditioning Unit | In English | → Human-computer interaction |
| CID | Computer Interface Device | In English | → Human-computer interaction |
| CIDB | Centre d'Information et de Documentation sur le Bruit | In French | → 002 |
| CIDEC | Centro Interdisciplinario de Estudios Culturales | In Spanish | → Research institutes → Civilization, culture, progress |
| CIDT | Centre de développement des technologies de l’information | In French | → Computer science → Telecommunications |
| CIE | Communications Interface Equipment | In English | → Human-computer interaction → Telecommunications |
| CIECC | Consejo Interamericano para la Educación, la Ciencia y la Cultura | In Spanish | → International relations → Education → Mathematics and natural sciences → Civilization, culture, progress |
| CIFRE | Convention Industrielle de Formation par la Recherche | In French | → Research policy → Education |
| CIG | Communications and Interface Group | In English | → Human-computer interaction → Telecommunications |
| CIGOS | Canadian Interest Group on Open Systems | In English | → Organizations and associations → Computer science |
| CIGREF | Club Informatique des Grandes Entreprises Françaises | In French | → Computer science → Organizations and associations |
| CIIBA | Comité Interministériel de l'Informatique et de la Bureautique dans l'Administration | In French | → Computer science → Central administration |
| CIL | Concours Informatique Luxembourgeois | In French | → Computer science |
| CIM | Computer Input Multiplexer | In English | → Computer science |
| CIM | Computer-Integrated Manufacturing | In English | → Hardware → Electronics |
| CIMLS | Cercle Informatique Médicale entre Lesse et Semois | In French | → Organizations and associations → Computer science → Medicine |
| CINES | Centre Informatique National de l'Enseignement Supérieur (www.cines.fr) | In French | → Computer science → Education |
| CIP | Communications Interface Processor | In English | → Human-computer interaction → Telecommunications |
| CIP | Control and Interface Panel | In English | → Human-computer interaction |
| CIPM | Comitê International des Pesos e Medidas = CIPM | Comité International des Poids et Mesures | In French |
In Portuguese | → Standardization |
| CIPM | Comité International des Poids et Mesures = (look above) |
In French | → Standardization |
| CIR | Crédit d'Impôt Recherche | In French | → Research policy → Taxes, duties |
| CIRIT | Comissió Interdepartemental de Recreca i Innovació Tecnològica | In Spanish | → Public administration, government → Research policy |
| CIRST | Comité Interministériel de la Recherche Scientifique et Technique | In French | → Central administration → Research policy |
| CIS | Communication Interface System | In English | → Human-computer interaction |
| CISC | Complex Instruction Set Computer | In English | → Hardware |
| CISI | Comité Interministériel pour la Société de l'Information | In French | → Central administration → Computer science → Telecommunications |
| CISI | Compagnie Internationale de Services en Informatique | In French | → Computer science |
| CISO | Chief Information Security Officer = RSSI | Responsable de la Sécurité des Systèmes d'Information | In French |
In English | → Computer science |
| CITHER | Consultation en Texte Intégral des THèses en Réseau | In French | → Knowledge management → Higher education, universities → Mathematics and natural sciences |
| CITIC | Centro Andaluz de Innovación y Tecnologías de la Información y las Comunicaciones (www.citic.es) | In Spanish | → Research institutes → Computer science → Telecommunications |
| CITILOG | Carrefour Intelligent - Traitement d'Images LOGiciels | In French | → Image processing → Transport and postal services |
| CITM | Centre de la Imatge i Tecnologia Multimèdia (www.citm.upc.edu) | In Spanish | → Image processing → Cinema, movies |
| CITS | Croatian Information Technology Society | In English | → Organizations and associations → Computer science → Telecommunications |
| CIU | Communication Interface Unit | In English | → Human-computer interaction → Telecommunications |
| CIU | Computer Interface Unit | In English | → Human-computer interaction |
| CIU | Controller Interface Unit | In English | → Human-computer interaction |
| CIUMR | Comisión Internacional de Unidades y Medidas Radiológicas = ICRU | International Commission on Radiation Units and Measurements | In English = CIUMR | Commission Internationale des Unités et des Mesures de Radiation | In French = CIUMR | Comissão Internacional de Unidades e Medidas Radiação | In Portuguese |
In Spanish | → Standardization → Nuclear technology |
| CIUMR | Comissão Internacional de Unidades e Medidas Radiação = ICRU (look above) |
In Portuguese | → Standardization → Nuclear technology |
| CIUMR | Commission Internationale des Unités et des Mesures de Radiation = ICRU (look above) |
In French | → Standardization → Nuclear technology |
| CJECE | Canadian Journal of Electrical Computer Engineering | In English | → Serial publications, periodicals → Computer science → Electrical engineering |
| CLARA | Cooperación Latino Americana de Redes Avanzadas | In Spanish | → Networks, communication |
| CLIPS | Communication Langagière et Interaction Personne-Système | In French | → Human-computer interaction → Linguistics |
| CLIVE | Computer-aided Learning In Veterinary Education | In English | → Computer science → Education → Veterinary medicine |
| CLMC | Central Logistics Management Center | In English | → Maintenance and logistics |
| CLO | Club Linux Outaouais | In French | → Organizations and associations → Operating systems |
| CLORA | CLub des Organismes de Recherche Associés | In French | → Organizations and associations → Research policy |
| CLS | Cable Library System | In English | → Hardware → Libraries |
| CLS | Computational Life Sciences | In English | → Computer-based techniques → Biological sciences |
| CM | Change Management | In English | → Management |
| CMAME | Computer Methods in Applied Mechanics and Engineering | In English | → Serial publications, periodicals → Computer science → 531 → Mechanical engineering |
| CMB | Compagnie des Machines Bull | In French | → Hardware |
| CMC | Central Maintenance Computer | In English | → Hardware → Maintenance and logistics |
| CMCS | Centralized Maintenance Computer System | In English | → Software → Maintenance and logistics |
| CMDB | Configuration Management Date Base | In English | → Hardware |
| CMIP | Common Management Information Protocol | In English | → Networks, communication |
| CMIRH | Centre Mondial Informatique et Ressources Humaines | In French | → Management → Personnel management |
| CML | Chemical Markup Language | In English | → Programming languages → Chemistry |
| CMM | Condition-Monitored Maintenance | In English | → Maintenance and logistics |
| CMMI | Capability Maturity Model Integration | In English | → Computer science |
| CMS | Content Management System = SGC | Système de Gestion de Contenu(s) | In French |
In English | → Document processing → Knowledge management |
| CMS | Content Management Server | In English | → Networks, communication → Document processing → Knowledge management |
| CMSI | Command Monitor System Interface | In English | → Human-computer interaction |
| CMTS | Computerized Maintenance Test System | In English | → Computer science → Maintenance and logistics |
| CMwA | Computers and Mathematics with Applications | In English | → Serial publications, periodicals → Computer science → Mathematics |
| CNAC | Centre National d'Art et de Culture | In French | → Civilization, culture, progress → Arts |
| CNC | Computer Numerically Controlled | In English | → Computer science |
| CNC | Computer Numerical Control | In English | → Computer science |
| CNCSIS | Consiliu Naţional al Cercetării Ştiinţifice din Învăţământul Superior | In Romanian | → Organizations and associations → Research policy |
| CNCSIS | Consiliul National al Cercetarii Stiintifice din Învatamântul Superior | In Romanian | → Research policy → Higher education, universities |
| CNEI | Centre National d'Études Informatiques | In French | → Computer science |
| CNER | Comité National d'Évaluation de la Recherche | In French | → Research policy |
| CNFK | Campus Numérique Francophone de Kinshasa | In French | → Networks, communication |
| ČNI | Český Normalizační Institut | In Czech | → Standardization |
| CNII | Centre National d’Ingénierie de l’Information | In French | → Computer science |
| CNIL | Commission Nationale Informatique et Libertés | In French | → Organizations and associations → Computer science → Fundamental rights |
| CNIL | Commission Nationale de l'Informatique et des Libertés (www.cnil.fr) | In French | → Computer science → Politics |
| CNR | Consiglio Nazionale delle Ricerche | In Italian | → Research policy |
| CNRS | Centre National de la Recherche Scientifique | In French | → Research policy → Mathematics and natural sciences |
| CNRT | Centre National de Recherche Technologique | In French | → Research policy → Engineering, technology |
| CNRT | Comité National de la Recherche Technologique | In French | → Research policy → Engineering, technology |
| CNS | Cognitive Neuroscience Society (www.cogneurosociety.org) | In English | → Organizations and associations → Artificial intelligence → Psychology → Neurology |
| CNS | Computation and Neural Systems (www.cns.caltech.edu) | In English | → Research institutes → Artificial intelligence |
| COAST | Competence Network for Advanced Speech Technologies | In English | → Human-computer interaction → Computer-based techniques → Language, linguistics, literature |
| COBOL | Common Business-Oriented Language | In English | → Programming languages |
| CoCAC | Conseiller de Coopération et d'Action Culturelle | In French | → International relations → Civilization, culture, progress → Arts |
| CoCom | Control and Computers | In English | → Serial publications, periodicals → Computer science |
| CODINORM | Côte d'Ivoire Normalisation | In French | → Standardization |
| COIM | Checkout Interpreter (Software) Module | In English | → Software |
| COLD/ERM | Computer Output to Laser Disk/Enterprise Report Management | In English | → Document processing → Knowledge management |
| COLO | Club Opportunité des Logiciels Ouverts | In French | → Software |
| CoLoSS | COnstraint LOcal Search Solver | In English | → Computer-based techniques |
| COM | Computer Output Microfilm | In English | → Computer science |
| COM | Computer Output Microfiche | In English | → Computer science |
| COMORE | Contrôle et Modélisation de Ressources Renouvelables | In French | → Computer science → Nature |
| ComPh | Computers in Physics | In English | → Serial publications, periodicals → Computer science → Physics |
| CompJ | The Computer Journal | In English | → Serial publications, periodicals → Computer science |
| CompTIA | Computing Technology Industry Association | In English | → Associations → Computer science |
| ComSE | Computing Systems in Engineering | In English | → Serial publications, periodicals → Computer science → Engineering, technology |
| CONQUEST | Conference on Quality Engineering in Software Technology | In English | → Congresses → Software |
| COPANIT | Comisión Panameña de Normas Industriales y Técnicas | In Spanish | → Standardization |
| COPANT | Comisión Panamericana de Normas Técnicas | In Spanish | → Organizations and associations → Standardization |
| COPEC | Contribution de la Psychologie et de l'Ergonomie Cognitives (à la coopération homme-machine dans la conduite automobile) | In French | → Human-computer interaction → Psychology → Vehicle engineering → Transport and postal services |
| CoPhC | Computer Physics Communications | In English | → Serial publications, periodicals → Computer science → Physics |
| CoPhR | Computer Physics Reports | In English | → Serial publications, periodicals → Computer science → Physics |
| CORBA | Common Object Request Broker Architecture | In English | → Networks, communication |
| CORDIC | COordinate Rotation DIgital Computer | In English | → Computer science |
| CORDIS | Community Research and Development Information Service | In English | → Libraries → Research policy → Engineering, technology |
| CORE | Common Operational Research Equipment | In English | → Research policy |
| CORESE | Conceptual Resource Search Engine | In English | → Networks, communication → Libraries |
| COS | Console Operating System | In English | → Operating systems |
| COSM | Checkout Servicing and Maintenance | In English | → Maintenance and logistics |
| COSMIC | Computer Software Management and Information Center | In English | → Computer science |
| COSQC | Central Organization for Standardization and Quality Control | In English | → Standardization |
| COST | Co-operation in the field of Scientific and Technical Research | In English | → Research policy → European Union |
| CoStr | Computers and Structures | In English | → Serial publications, periodicals → Computer science |
| CP | Console Processor | In English | → Hardware |
| CP | Computer Program | In English | → Software |
| CP | Communication Processor | In English | → Hardware → Telecommunications |
| CPC | Computer Program Component | In English | → Software |
| CPC | Combinatorics, Probability and Computing | In English | → Serial publications, periodicals → Mathematics → Computer science |
| CPCEI | Computer Program Contract End Item | In English | → Software |
| CPCI | Computer Program Configuration Item | In English | → Software |
| CPCI | Computer Program Change Instruction | In English | → Software |
| CPCR | Computer Program Change Request | In English | → Software |
| CPCSS | CPC Software Solutions | In English | → Software |
| CPDDS | Computer Program Detail Design Specification | In English | → Software |
| CPDP | Computer Program Development Plan/Program | In English | → Software |
| CPDS | Computer Program Development Specification | In English | → Software |
| CPDS | Computer Program Design Specification | In English | → Software |
| CPDS | Computer Program Detailed Specification | In English | → Software |
| CPEI | Computer Program End Item | In English | → Software |
| CPIC | Computer Program Integration Contract | In English | → Software |
| CPLD | Complex Programmable Logic Device | In English | → Hardware → Electronics |
| CPM | Computer Program Module | In English | → Software |
| CPM | Contract Performance Management | In English | → Management → 3474 |
| CPPS | Computer Program Product Specification | In English | → Software |
| CPRS | Czechoslovak Pattern Recognition Society | In English | → Organizations and associations → Computer-based techniques |
| CPSS | Critical Phase System Software | In English | → Software |
| CPT | Computer Program Tape | In English | → Computer science |
| CPU | Central Processing Unit | In English | → Hardware |
| CPU | Command Processor Unit | In English | → Hardware |
| CPU | Computer Printer Unit | In English | → Computer science |
| CPU | Computer Processing Unit | In English | → Hardware |
| CQFD | Ce Qu'il Fallait Démontrer = QED | Quod Erat Demonstrandum | In Latin |
In French | → Science and knowledge |
| CQG | Comité Qualité Gestion | In French | → Quality management |
| CQIM | Configuration and Quality Information Management | In English | → Quality management |
| CQL | Common Query Language | In English | → Programming languages → Networks, communication |
| CRC | China Research Centre | In English | → Research policy |
| CRC | Cyclic Redundancy Check | In English | → Data → Networks, communication → Telecommunications |
| CRDP | Computer Resource Development Plan | In English | → Computer science |
| CREATIS | Centre de Recherche et d'Application en Traitement de l'Image et du Signal | In French | → Research institutes → Graphical processing → Image processing |
| CREM | Centre de Recherche en Économie et Management | In French | → Research institutes → Economics → Management |
| CREST | Comité de la Recherche Scientifique et Technique (de l'Union européenne) | In French | → Research policy → Mathematics and natural sciences → Applied sciences, technology |
| CREST | Comité de la REcherche Scientifique et Technique | In French | → Research policy → Mathematics and natural sciences → Applied sciences, technology |
| CRHC | Center for Reliable and High-Performance Computing | In English | → Computer science |
| CRI | Centre Relais Innovation | In French | → Research policy |
| CRIH | Centre Régional d'Informatique Hospitalière | In French | → Computer science → Medicine |
| CRIN | Coordination Recherche INdustrie | In French | → Research policy → Engineering, technology |
| CRIN | Centre de Recherche en Informatique de Nancy | In French | → Research institutes → Computer science |
| CRIS | Current Research Information Systems | In English | → Data → Knowledge management |