| CDP | Computational Data Processing | In English | → Data |
| CDP | Command Data Processor | In English | → Data |
| CDP | Computer Data Processing | In English | → Data |
| CDS | Computer Design and Simulation | In English | → Computer-based techniques |
| CDSL | Computer Data System Laboratory | In English | → Research institutes → Data |
| CDT | Configuration Data Table | In English | → Data |
| CDTD | CAD Drafting & Tool Design Technology | In English | → Computer-based techniques |
| CDU | Coupling Display Unit | In English | → Human-computer interaction |
| CDU | Coupling Data Unit | In English | → Data |
| CDU | Computer Display Unit | In English | → Human-computer interaction |
| CDW | Command Data Word | In English | → Data |
| CEA | Computer Engineering Associates | In English | |
| CEDIA | Consorcio Ecuatoriano para el Desarrollo de Internet Avanzado | In Spanish | → Internet → Organizations and associations → Telecommunications |
| CEE | Computers and Electrical Engineering | In English | → Serial publications, periodicals → Electrical engineering |
| CEESI | Centre d'Études et d'Expérimentation des Systèmes d'Information | In French | |
| CEG | Cognitive Ergonomics Group | In English | → Organizations and associations → Human-computer interaction |
| CEGETI | Centre Électronique de Gestion, d'Études et de Traitement de l'Information | In French | → Document processing → Libraries |
| CEIT | Crew Equipment Interface Test | In English | → Human-computer interaction |
| CENTAL | Centre de traitement automatique du langage | In French | → Computer-based techniques → Language, linguistics, literature |
| CENTIC | Centro de Tecnologías de Información y Comunicación (www.centic.es) | In Spanish | → Telecommunications |
| CEP | Calcolatrice Elettronica Pisana | In Italian | → Electronics |
| CERFACS | Centre de Recherche et de Formation avancée en Calcul Scientifique | In French | → Mathematics |
| CERMICS | Centre d'Enseignement et de Recherche en Mathématiques, Informatique et Calcul Scientifique | In French | → Higher education, universities → Mathematics |
| CERV | Centre Européen de Réalité Virtuelle | In French | → Image processing |
| CES | Consumer Electronics Show | In English | → Electronics |
| CESIA | Centre d'Études des Systèmes d'Information des Administrations | In French | → Public administration, government → Telecommunications |
| CESTEL | Centro Español de Servicios Telemáticos (www.cestel.es) | In Spanish | → Telecommunications |
| CETELIC | Centre de Traitement Électronique Intercaisses | In French | → Computer-based techniques → Telecommunications |
| CEVA | Content-Enabled Vertical Application | In English | → Software → Document processing |
| CF | Computers and Fluids | In English | → Serial publications, periodicals → 532 |
| CFAO | Conception et Fabrication Assistées par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| 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 → 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 | → Medicine |
| CGIP | Computer Graphics Image Processing | In English | → Serial publications, periodicals |
| CGM | Computer Graphics Metafile | In English | → Data → Graphical processing → Image processing |
| CGMP | Cisco Group Management Protocol | In English | → Networks, communication |
| CGTI | Conseil Général des Technologies de l'Information | In French | → Telecommunications |
| 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 |
| CHI | Computer-to-Human Interface | In English | → Human-computer interaction |
| CHIP | Children's Hospital Informatics Program | In English | → Software → Pediatry |
| CHIR | Chirurgie, Informatique et Robotique | In French | → 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 | Centro Internacional de Computação (www.unicc.org) = CICE | Centro Internacional de Cálculos Electrónicos | In Spanish = ICC | International Computing Centre | In English = CIC | Centre International de Calcul | In French |
In Portuguese | → United Nations |
| CIC | Centre International de Calcul (www.unicc.org) = CICE, ICC (look above) |
In French | → United Nations |
| CICE | Centro Internacional de Cálculos Electrónicos (www.unicc.org) = CIC, ICC (look above) |
In Spanish | → United Nations |
| CICU | Computer Interface Conditioning Unit | In English | → Human-computer interaction |
| CID | Computer Interface Device | In English | → Human-computer interaction |
| CIDT | Centre de développement des technologies de l’information | In French | → Telecommunications |
| CIE | Communications Interface Equipment | In English | → Human-computer interaction → Telecommunications |
| CIG | Communications and Interface Group | In English | → Human-computer interaction → Telecommunications |
| CIGOS | Canadian Interest Group on Open Systems | In English | → Organizations and associations |
| CIGREF | Club Informatique des Grandes Entreprises Françaises | In French | → Organizations and associations |
| CIIBA | Comité Interministériel de l'Informatique et de la Bureautique dans l'Administration | In French | → Central administration |
| CIL | Concours Informatique Luxembourgeois | In French | |
| CIM | Computer-Integrated Manufacturing | In English | → Hardware → Electronics |
| CIM | Computer Input Multiplexer | In English | |
| CIMLS | Cercle Informatique Médicale entre Lesse et Semois | In French | → Organizations and associations → Medicine |
| CINES | Centre Informatique National de l'Enseignement Supérieur (www.cines.fr) | In French | → Education |
| CIP | Control and Interface Panel | In English | → Human-computer interaction |
| CIP | Communications Interface Processor | In English | → Human-computer interaction → Telecommunications |
| 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 → Telecommunications |
| CISI | Compagnie Internationale de Services en Informatique | In French | |
| CISO | Chief Information Security Officer = RSSI | Responsable de la Sécurité des Systèmes d'Information | In French |
In English | |
| CITIC | Centro Andaluz de Innovación y Tecnologías de la Información y las Comunicaciones (www.citic.es) | In Spanish | → Research institutes → 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 → Telecommunications |
| CIU | Controller Interface Unit | In English | → Human-computer interaction |
| CIU | Communication Interface Unit | In English | → Human-computer interaction → Telecommunications |
| CIU | Computer Interface Unit | In English | → Human-computer interaction |
| CJECE | Canadian Journal of Electrical Computer Engineering | In English | → Serial publications, periodicals → 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 |
| CLO | Club Linux Outaouais | In French | → Organizations and associations → Operating systems |
| CLS | Computational Life Sciences | In English | → Computer-based techniques → Biological sciences |
| CLS | Cable Library System | In English | → Hardware → Libraries |
| CMAME | Computer Methods in Applied Mechanics and Engineering | In English | → Serial publications, periodicals → 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 |
| CML | Chemical Markup Language | In English | → Programming languages → Chemistry |
| CMMI | Capability Maturity Model Integration | In English | |
| 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 | → Maintenance and logistics |
| CMwA | Computers and Mathematics with Applications | In English | → Serial publications, periodicals → Mathematics |
| CNC | Computer Numerical Control | In English | |
| CNC | Computer Numerically Controlled | In English | |
| CNEI | Centre National d'Études Informatiques | In French | |
| CNFK | Campus Numérique Francophone de Kinshasa | In French | → Networks, communication |
| CNII | Centre National d’Ingénierie de l’Information | In French | |
| CNIL | Commission Nationale Informatique et Libertés | In French | → Organizations and associations → Fundamental rights |
| CNIL | Commission Nationale de l'Informatique et des Libertés (www.cnil.fr) | In French | → Politics |
| 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 |
| CoCom | Control and Computers | In English | → Serial publications, periodicals |
| 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 | |
| COM | Computer Output Microfiche | In English | |
| COMORE | Contrôle et Modélisation de Ressources Renouvelables | In French | → Nature |
| ComPh | Computers in Physics | In English | → Serial publications, periodicals → Physics |
| CompJ | The Computer Journal | In English | → Serial publications, periodicals |
| CompTIA | Computing Technology Industry Association | In English | → Associations |
| ComSE | Computing Systems in Engineering | In English | → Serial publications, periodicals → Engineering, technology |
| CONQUEST | Conference on Quality Engineering in Software Technology | In English | → Congresses → Software |
| 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 → Physics |
| CoPhR | Computer Physics Reports | In English | → Serial publications, periodicals → Physics |
| CORBA | Common Object Request Broker Architecture | In English | → Networks, communication |
| CORDIC | COordinate Rotation DIgital Computer | In English | |
| CORESE | Conceptual Resource Search Engine | In English | → Networks, communication → Libraries |
| COS | Console Operating System | In English | → Operating systems |
| COSMIC | Computer Software Management and Information Center | In English | |
| CoStr | Computers and Structures | In English | → Serial publications, periodicals |
| CP | Computer Program | In English | → Software |
| CP | Communication Processor | In English | → Hardware → Telecommunications |
| CP | Console Processor | In English | → Hardware |
| CPC | Computer Program Component | In English | → Software |
| CPC | Combinatorics, Probability and Computing | In English | → Serial publications, periodicals → Mathematics |
| CPCEI | Computer Program Contract End Item | In English | → Software |
| CPCI | Computer Program Change Instruction | In English | → Software |
| CPCI | Computer Program Configuration Item | 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 Detailed Specification | In English | → Software |
| CPDS | Computer Program Development Specification | In English | → Software |
| CPDS | Computer Program Design 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 |
| 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 | |
| CPU | Central Processing Unit | In English | → Hardware |
| CPU | Command Processor Unit | In English | → Hardware |
| CPU | Computer Processing Unit | In English | → Hardware |
| CPU | Computer Printer Unit | In English | |
| CQL | Common Query Language | In English | → Programming languages → Networks, communication |
| CRC | Cyclic Redundancy Check | In English | → Data → Networks, communication → Telecommunications |
| CRDP | Computer Resource Development Plan | In English | |
| CREATIS | Centre de Recherche et d'Application en Traitement de l'Image et du Signal | In French | → Research institutes → Graphical processing → Image processing |
| CRHC | Center for Reliable and High-Performance Computing | In English | |
| CRIH | Centre Régional d'Informatique Hospitalière | In French | → Medicine |
| CRIN | Centre de Recherche en Informatique de Nancy | In French | → Research institutes |
| CRIS | Current Research Information Systems | In English | → Data → Knowledge management |
| CRISD | Computer Resource Integration Support Document | In English | |
| CRISD | Computer Resources Integrated Support Document | In English | |
| CRISP | Computer Resources Integrated Support Plan | In English | |
| CRR | Computer Run Report | In English | |
| CRS | Computer Resources Support | In English | |
| CRT | Computer Response Time | In English | |
| CS&L | Computer Speech & Language | In English | → Serial publications, periodicals → Language, linguistics, literature |
| CSC | Computer Sciences Corporation (www.csc.com) | In English | |
| CSC | Computer Software Component | In English | → Software |
| CSC | Computer Software Configuration | In English | → Software |
| CSCI | Configuration Software Computer Item | In English | → Software |
| CSCI | Computer Software Configuration Item | In English | → Software |
| CSCW | Computer Supported Cooperative Work | In English | → Computer-based techniques |
| CSD | Computer System Director | In English | |
| CSDF | Central Source Data File | In English | → Data |
| CSDM | Computer System Diagnostic Manual | In English | |
| CSDT | Computer Software Data Tape | In English | |
| CSE | Computer Support Equipment | In English | |
| CSEd | Computer Science Education | In English | → Serial publications, periodicals → Education |
| CSI | Crew Software Interface | In English | → Human-computer interaction |
| CSIR | Computer Software Integration Review | In English | → Software |
| CSIR | Computer Systems Integration Review | In English | → Hardware |
| CSL | Computer Status Light | In English | |
| CSM | Computer Status Matrix | In English | |
| CSMI | Commission Spécialisée des Marchés d'Informatique | In French | |
| CSOM | Computer System Operator's Manual | In English | |
| CSP | Certified Special Processor | In English | → Hardware |
| CSPL | Certified Special Processor List | In English | → Hardware |
| CSPU | Core Segment Processing Unit | In English | |
| CSQ | Contrôle Statistique de la Qualité | In French | → Data → Statistics |
| CSR | Continuous Speech Recognition | In English | → Computer-based techniques → Linguistics |
| CSRP | Computer and Software Review Panel | In English | → Hardware → Software |