| CCIP | Chamber for Cooperation and Incentive Partnership | In English | → Organizations and associations |
| CCIR | International Radio Consultative Committee | In English | → Organizations and associations → Telecommunications |
| CCITT | Certification for IT&T | In English | → Networks, communication → Telecommunications |
| CCL | Confédération du Commerce luxembourgeois | In French | → Organizations and associations → Trade |
| CCM | Comment Ça Marche (www.commentcamarche.net) | In French | → Networks, communication → Computer science |
| CCM | Comitato Collaborazione Medica | In Italian | → Organizations and associations → Medicine |
| CCNI | Comité Consultatif National de l’Immunisation | In French | → Organizations and associations → Immunology and allergy → Pharmacology, toxicology |
| CCP | Confederação do Comércio e Serviços de Portugal | In Portuguese | → Organizations and associations → Industry, industrial policy → 33846 |
| CCP | Confederación de Cuadros y Profesionales | In Spanish | → Organizations and associations → Labour, labour economics |
| CCP | Computer Control Panel | In English | → Computer science |
| CCPA | Conseil Canadien de Protection des Animaux | In French | → Organizations and associations → Nature and society |
| CCPCE | Current Contents Physical, Chemical and Earth Sciences | In English | → Serial publications, periodicals → Physics → Chemistry → Earth sciences |
| CCPM | Comité Central des Pêches Maritimes | In French | → Organizations and associations → Fishing, hunting |
| CCQ | Commission de la Construction du Québec (www.ccq.org) | In French | → Organizations and associations → Building |
| CCQ | Centre de Conservation du Québec (www.ccq.mcc.gouv.qc.ca) | In French | → Museums |
| CCR | Centre Commun de Recherche | In French | → Research policy → Mathematics and natural sciences → Applied sciences, technology |
| CCRRDT | Comité Consultatif Régional pour la Recherche et le Développement Technologique | In French | → Regional administration → Research policy → Engineering, technology |
| CCS | Comité Consultatif Scientifique | In French | → Organizations and associations → Mathematics and natural sciences |
| CCS | Central Computer and Sequencer | In English | → Computer science |
| CCS | Computer Core Segment | In English | → Hardware |
| CCSD | Centre de Communication Scientifique Directe | In French | → Libraries |
| CCSEAS | Canadian Council of Southeast Asian Studies | In English | → Organizations and associations → Language, linguistics, literature → Geography, biography, history |
| CCSI | Comitê de Coordenação de Sistemas de Informação = CCSI | Comité de Coordinación de los Sistemas de Información | In Spanish = ISCC | Information Systems Coordination Committee | In English = CCSI | Comité de Coordination des Systèmes d'Information | In French |
In Portuguese | → Knowledge management → United Nations |
| CCSI | Comité de Coordination des Systèmes d'Information = ISCC (look above) |
In French | → Knowledge management → United Nations |
| CCSI | Comité de Coordinación de los Sistemas de Información = ISCC (look above) |
In Spanish | → Knowledge management → United Nations |
| CCSL | Center for Chinese Studies Library | In English | → Libraries → Language, linguistics, literature → Geography, biography, history |
| CCSTI | Centre de Culture Scientifique, Technique et Industrielle | In French | → Civilization, culture, progress → Mathematics and natural sciences → Engineering, technology |
| CCT | Computer-Compatible Tape | In English | → Computer science |
| ccTLD | Country code Top Level Domain | In English | → Networks, communication → Telecommunications |
| CCW | Confédération Construction Wallonne (www.ccw.be) | In French | → Organizations and associations → Building |
| CCW | Computer Center Werner | In English | → Computer science |
| CCWH | Coordinating Council for Women in History | In English | → Organizations and associations → History |
| CDARA | Conception, Décision, Adaptation du Réseau aux Attentes | In French | → Quality management → Electrical engineering |
| CDB | Computer Data Bus | In English | → Hardware → Data |
| CDB | Command Data Base | In English | → Data |
| CDB | Central Data Buffer | In English | → Data |
| CDBFR | Common Data Buffer | In English | → Data |
| CDC | Computer Development Center | In English | → Research institutes → Computer science |
| CDC | Command and Data Handling Console | In English | → Computer science |
| CDC | Control Data Corporation | In English | → Computer science |
| CDC | Connected Device Configuration | In English | → Computer science |
| CDD | Common Data Dictionary | In English | → Data |
| CDDP | Centre Départemental de Documentation Pédagogique | In French | → Libraries → Education |
| CdÉ | Chronique d'Égypte = CE | Chronique d'Égypte | In French |
In French | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| CDE | Collaborative Development Environment | In English | → Software |
| CDEFI | Conférence des Directeurs des Écoles Françaises d'Ingénieurs | In French | → Organizations and associations → Specialized or (poly)technical colleges |
| CDELI | Centro de Dokumentado kaj Esplorado pri la Lingvo Internacia = CDELI | Centre de Documentation et d'Étude sur la Langue Internationale | In French |
In Esperanto | → Libraries → Artificial languages (linguistics) |
| CDELI | Centre de Documentation et d'Étude sur la Langue Internationale = (look above) |
In French | → Libraries → Artificial languages (linguistics) |
| CDERA | Caribbean Disaster Emergency Response Agency (www.cdera.org) | In English | → Organizations and associations → Natural disasters |
| CDF | Compound Document Format | In English | → Data |
| CDF | Central Data Facility | In English | → Data |
| CDF | Combined Data File | In English | → Data |
| CDHR | Comité Départemental d’Habitat et d’aménagement Rural | In French | → Organizations and associations → Agricultural sciences → Regional planning |
| CDI | CDNL Committee on Digital Issues | In English | → Organizations and associations → Libraries |
| CDIAC | Carbon Dioxide Information Analysis Center | In English | → Research institutes → Meteorology, climatology |
| CDLC | Connected Limited Device Configuration | In English | → Software |
| CDLI | Cuneiform Digital Library Initiative | In English | → Writing systems → Libraries → Language, linguistics, literature |
| CDP | Command Data Processor | In English | → Data |
| CDP | Computer Data Processing | In English | → Data |
| CDP | Computational Data Processing | In English | → Data |
| CDS | Computer Design and Simulation | In English | → Computer-based techniques |
| CDS | Combinatie Dordrecht Sultana | In Dutch | → Organizations and associations → Sport, physical exercises |
| CDS | Cognitive Development Society | In English | → Organizations and associations → Psychology |
| CDSL | Computer Data System Laboratory | In English | → Research institutes → Data |
| CDT | Configuration Data Table | In English | → Data |
| CDT | Connaissance des Temps | In English | → Serial publications, periodicals → Astronomy |
| CDTD | Comparative Dictionary of Tibetan Dialects | In English | → Dictionaries → Linguistics |
| CDTD | CAD Drafting & Tool Design Technology | In English | → Computer-based techniques |
| CDU | Classification Décimale Universelle = UDK | Universala Dekuma Klasifiko | In Esperanto = UDC | Universal Decimal Classification | In English = UDC | Universele Decimale Classificatie | In Dutch = CDU | Clasificación Decimal Universal | In Spanish = UDC | Universel Decimal Classifikation | In Danish |
In French | → Libraries |
| CDU | Clasificación Decimal Universal = UDK, UDC (look above) |
In Spanish | → Libraries |
| CDU | Centre de Documentation de l'Urbanisme (www.cdu.urbanisme.equipement.gouv.fr) | In French | → 002 → Regional planning → Architecture |
| CDU | Coupling Display Unit | In English | → Human-computer interaction |
| CDU | Computer Display Unit | In English | → Human-computer interaction |
| CDU | Coupling Data Unit | In English | → Data |
| CDW | Command Data Word | In English | → Data |
| CDW | Combinatie Dorestad Wijk bij Duurstede | In Dutch | → Organizations and associations → Sport, physical exercises |
| CE | Comité Exécutif | In French | → Management |
| CE | Chronique d'Égypte = CdÉ (look above) |
In French | → Serial publications, periodicals → Language, linguistics, literature → Geography, biography, history |
| CEA | Commissariat à l'Énergie Atomique | In French | → Research institutes → Nuclear, atomic, and molecular physics → Energy economics → Engineering, technology |
| CEA | Computer Engineering Associates | In English | → Computer science |
| CEA | Consumer Electronics Association | In English | → Associations → Electronics |
| CEA | Commissariat à l’Énergie Atomique | In French | → Organizations and associations → 5931 → Energy economics → 6210 |
| CEAB | Central European Astrophysical Bulletin | In English | → Serial publications, periodicals → Astronomy |
| CEAL | Council on East Asian Libraries | In English | → Libraries → Organizations and associations |
| CEATAL | Comisión Empresarial de Asesoramiento Técnico en Asuntos Laborales | In Spanish | → Organizations and associations → Labour, labour economics |
| CEBED | Centre Belgo-Européen d'Études des Drapeaux | In French | → Organizations and associations → 9299 |
| CEBTP | Centre Expérimental du Bâtiment et des Travaux Publics | In French | → Research institutes → Civil engineering → Building |
| CEC | Confederación Española de Comercio | In Spanish | → Organizations and associations → Trade |
| CEC | Comisión Especial de Comercio | In Spanish | → Organizations and associations → Trade |
| CEC | Council for Exceptional Children | In English | → Organizations and associations → Education |
| CEC | Commission for Environmental Cooperation | In English | → Organizations and associations → International relations → Nature |
| CECA | Club d'Étude du Comportement Aviaire | In French | → Organizations and associations → Zoology |
| CECC | Conférence des Évêques Catholiques du Canada = CCCB | Canadian Conference of Catholic Bishops | In English |
In French | → Organizations and associations → Roman catholic church |
| CECE | Committee for the European Construction Equipment (www.cece-eu.org) | In English | → Organizations and associations → Civil engineering → Building |
| CECIMO | Comité Européen de Coopération des Industries de la Machine-Outil (www.cecimo.be) | In French | → Organizations and associations → Mechanical engineering |
| CED | Centre for Education & Documentation | In English | → Libraries → Education |
| CED | Centro por Esploro kaj Dokumentado pri la Monda Lingvo-Problemo | In Esperanto | → Libraries → Language, linguistics, literature |
| CEDAW | Committee for the Elimination of Discrimination against Women | In English | → Organizations and associations → Feminism |
| CEDEM | Centar za demokratiju i ljudska prava = CEDEM | Center for democracy and human rights | In English |
In Serbian | → Research institutes → Democracy → Fundamental rights |
| CEDEM | Center for democracy and human rights = (look above) |
In English | → Research institutes → Democracy → Fundamental rights |
| CEDIA | Consorcio Ecuatoriano para el Desarrollo de Internet Avanzado | In Spanish | → Internet → Organizations and associations → Telecommunications |
| CEDIM | Centro de Estudios sobre Derecho Internacional y Mundialización (www.cedim.uqam.ca) = CEDIM | Centre d'Études sur le Droit International et la Mondialisation | In French |
In Spanish | → Research institutes → Trade → International law |
| CEDIM | Centre d'Études sur le Droit International et la Mondialisation (www.cedim.uqam.ca) = (look above) |
In French | → Research institutes → Trade → International law |
| CEE | Computers and Electrical Engineering | In English | → Serial publications, periodicals → Computer science → Electrical engineering |
| CEEA | Cercle d'Études Espérantistes de l'Ariège | In French | → Organizations and associations |
| CEED | Comprehensive English-Esperanto Dictionary | In English | → Dictionaries → Artificial languages (linguistics) |
| CEEETA | Centro de Estudos em Economia da Energia, dos Transportes e do Ambiente | In Portuguese | → Research institutes → Nature → Energy economics → Applied sciences, technology |
| CEEI | Conselho Estadual de Educação Escolar Indígenas | In Portuguese | → Organizations and associations → Education |
| CEEJ | Canadian Electrical Engineering Journal | In English | → Serial publications, periodicals → Electrical engineering |
| CEEMAN | Central and Eastern European Management Development Associations | In English | → Associations → Management |
| CEEP | Centre européen des entreprises à participation publique et des entreprises d'intérêt économique général | In French | → Organizations and associations → 3384 |
| CEEP | Centre Européen d'Etudes sur les Polyphosphates | In French | → Organizations and associations → 665 |
| CEESI | Centre d'Études et d'Expérimentation des Systèmes d'Information | In French | → Computer science |
| CEFA | Comitato Europeo per la Formazione e l'Agricoltura | In Italian | → Organizations and associations → Education → 83 |
| CEFTA | Central European Free Trade Agreement | In English | → Associations → Trade |
| CEG | Calligraphy Education Group | In English | → Writing systems → Education → Language, linguistics, literature |
| CEG | Cognitive Ergonomics Group | In English | → Organizations and associations → Human-computer interaction |
| CEGELY | Centre de Génie Électrique de Lyon | In French | → Research institutes → Electrical engineering |
| CEGETI | Centre Électronique de Gestion, d'Études et de Traitement de l'Information | In French | → Document processing → Libraries |
| CEHM | Companion Encyclopaedia of the History of Medicine | In English | → Dictionaries → Medicine → History |
| CEI | Comitato Elettrotecnico Italiano (www.ceiuni.it) | In Italian | → Organizations and associations → Electrical engineering |
| CEIAS | Centre d'Études de l'Inde et de l'Asie du Sud | In French | → Research institutes → Area studies |
| CEIS | Centro Italiano di Solidarietà | In Italian | → Organizations and associations |
| CEIT | Crew Equipment Interface Test | In English | → Human-computer interaction |
| CEJ | Chemistry European Journal | In English | → Serial publications, periodicals → Chemistry |
| ĈEJ | Ĉeĥa Esperanto-Junularo | In Esperanto | → Organizations and associations |
| CEJ | Ceará Esperanto-Junularo | In Esperanto | → Organizations and associations |
| CEJIL | Center for Justice and International Law (www.cejil.org) | In English | → Organizations and associations → International law → Fundamental rights |
| CEJPh | Central European Journal of Physics | In English | → Serial publications, periodicals → Physics |
| CEL | Cours en ligne | In French | → Libraries → Higher education, universities |
| CELAVAR | Comité d’Étude et de Liaison des Associations à Vocation Agricole et Rurale | In French | → Associations → Agricultural sciences |
| CELIOS | Club En Liefde Is Ons Streven | In Dutch | → Organizations and associations → Sport, physical exercises |
| CELSA | Centre d'Études Littéraires et Scientifiques Appliquées | In French | → Specialized or (poly)technical colleges → Newspapers, journalism |
| CEMA | Cercle d'Échange du Monde Agricole | In French | → Organizations and associations → Agricultural sciences |
| CEMAC | Comunitat Econòmica i Monetària de l'Àfrica Central | In Catalan | → Organizations and associations → Economics → European Union |
| CEMB | Conseil des États de la mer Baltique = CBSS | Council of the Baltic Sea States | In English = BDDK | Baltık Denizi Devletleri Konseyi | In Turkish |
In French | → Organizations and associations → International relations |
| CeMDA | Celestial Mechanics and Dynamical Astronomy | In English | → Serial publications, periodicals → Astronomy |
| CeMec | Celestial Mechanics | In English | → Serial publications, periodicals → Astronomy |
| CEMEF | Centre de Mise en Forme des Matériaux (www-cemef.cma.fr) | In French | → Research institutes → 620 |
| CEMS | Centre d'Étude des Mouvements Sociaux | In French | → Research institutes → Sociology |
| CEN | Creative Environmental Networks | In English | → Organizations and associations → Nature |
| CEN | Comité Européen de Normalisation | In French | → Standardization |
| CENELEC | Comité Européen de Normalisation Électrotechnique | In French | → Standardization → Electrical engineering |
| 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 | → Computer science → Telecommunications |
| CEnTp | Engineering Thermophysics China | In English | → Serial publications, periodicals → Thermodynamics → Engineering, technology |
| CEO | Chief Executive Officer | In English | → Management |
| CEOE | Confederación Española de Organizaciones Empresariales | In Spanish | → Organizations and associations → 3384 |
| CEP | Calcolatrice Elettronica Pisana | In Italian | → Computer science → Electronics |
| CEPCIECC | Comisión Ejecutiva Permanente del Consejo Interamericano para la Educación, la Ciencia y la Cultura | In Spanish | → International relations → Education → Mathematics and natural sciences → Civilization, culture, progress |
| CEPIS | Centro Pan-americano de Engenharia Sanitária e Ciências do Ambiente (www.cepis.ops-oms.org) = CEPIS | Centro Panamericano de Ingeniería Sanitaria y Ciencias del Ambiente | In Spanish |
In Portuguese | → Organizations and associations → Environment, environmental sciences → Medicine |
| CEPIS | Centro Panamericano de Ingeniería Sanitaria y Ciencias del Ambiente (www.cepis.ops-oms.org) = (look above) |
In Spanish | → Organizations and associations → Environment, environmental sciences → Medicine |
| CEPIS | Council of European Professional Societies | In English | → Organizations and associations |
| CEPLIS | Conseil Européen des Professions Libérales | In French | → Organizations and associations |
| CEPMMT | Centre Européen de Prévision Météorologique à Moyen Terme (www.ecmwf.int) = ECMWF | European Centre for Medium-Range Weather Forecasts | In English |
In French | → Research institutes → Meteorology, climatology |
| CEPT | Conférence Européenne des Postes et Télécommunications (www.cept.org) | In French | → Organizations and associations → Telecommunications → Transport and postal services |
| CERB | Centre de Recherches Biologiques (www.cerb.fr) | In French | → Research institutes → Biological sciences |
| CERC3 | Chairmen of the European Research Councils' Chemistry Committees | In English | → Organizations and associations → Research policy |
| CERD | Committee on the Elimination of Racial Discrimination | In English | → Organizations and associations → Fundamental rights |
| CEREG | CEntre de REcherches sur la Gestion (www.dauphine.fr/cereg/) | In French | → Management |
| CERFACS | Centre de Recherche et de Formation avancée en Calcul Scientifique | In French | → Computer science → Mathematics |
| CERIB | Centre d'Études et de Recherches de l'Industrie du Béton | In French | → Research institutes → Civil engineering → Building |
| CERIF | Common European Research Information Format | In English | → Research policy → Knowledge management |
| CERMICS | Centre d'Enseignement et de Recherche en Mathématiques, Informatique et Calcul Scientifique | In French | → Computer science → Higher education, universities → Mathematics |
| CERPEG | Centre de Ressources pour l'Enseignement Professionnel en Économie-Gestion | In French | → Libraries → Economics → Education |
| CERTH | Centre for Research and Technology Hellas | In English | → Research policy → Engineering, technology |
| CERV | Centre Européen de Réalité Virtuelle | In French | → Image processing |
| CES | Consumer Electronics Show | In English | → Computer science → Electronics |
| CES | Confédération Européenne des Syndicats = ETUC | European Trade Union Confederation | In English = CES | Confederación Europea de Sindicatos | In Spanish = EVV | Europees Verbond van Vakverenigingen | In Dutch |
In French | → Organizations and associations → Labour, labour economics |
| CES | Confederación Europea de Sindicatos = ETUC, EVV (look above) |
In Spanish | → Organizations and associations → Labour, labour economics |
| CESA | Canadian Engineering Standards Association | In English | → Standardization → Associations → Engineering, technology |
| CESAR | Calendrier Électronique des Spectacles sous l'Ancien Régime | In French | → Libraries → Theatre |
| CESCM | Centre d'Études Supérieures de Civilisation Médiévale (www.mshs.univ-poitiers.fr/cescm) | In French | → Research institutes → History |
| CESI | Confédération Européenne des Syndicats Indépendants = CESI | Confederación Europea de Sindicatos Independientes | In Spanish |
In French | → Organizations and associations → Labour, labour economics |
| CESI | Confederación Europea de Sindicatos Independientes = (look above) |
In Spanish | → Organizations and associations → Labour, labour economics |
| CESIA | Centre d'Études des Systèmes d'Information des Administrations | In French | → Computer science → Public administration, government → Telecommunications |
| CESL | Confederación Europea de Sindicatos Libres | In Spanish | → Organizations and associations → Labour, labour economics |
| CESO | Canadian Executive Service Organization = SACO | Service d'Assistance Canadienne aux Organismes | In French |
In English | → Organizations and associations → Development |
| CESTAS | Centro di Educazione Sanitaria e Tecnologie Appropriate Sanitarie | In Italian | → Organizations and associations → Medicine |
| CESTEL | Centro Español de Servicios Telemáticos (www.cestel.es) | In Spanish | → Computer science → Telecommunications |
| CESVI | Cooperazione e Sviluppo | In Italian | → Organizations and associations → Development |
| CETELIC | Centre de Traitement Électronique Intercaisses | In French | → Computer-based techniques → Telecommunications |
| CETMA | Centre d'Études sur le Management | In French | → Management |
| CETR | Corpul Expertilor Tehnici din România | In Romanian | → Organizations and associations → Applied sciences, technology |
| CETU | Centre d'Études des Tunnels | In French | → Research institutes → Civil engineering |
| CEVA | Content-Enabled Vertical Application | In English | → Software → Document processing |
| CEVI | Centro di Volontariato Internazionale | In Italian | → Organizations and associations |
| CEVI | Confédération Européenne des Vignerons Indépendants | In French | → Organizations and associations → Agricultural sciences → Beverage industry |
| CEVO | Compascumer Erfscheidense Voetbal en Ontspanningsvereniging | In Dutch | → Organizations and associations → Sport, physical exercises |
| CEVU | Conseil des Études et de la Vie Universitaire | In French | → Organizations and associations → Higher education, universities |
| CEWC | Council for Education in World Citizenship | In English | → Organizations and associations → Education |
| CEyeR | Current Eye Research | In English | → Serial publications, periodicals → Biological sciences → Anatomy |
| CF | Computers and Fluids | In English | → Serial publications, periodicals → Computer science → 532 |
| CFA | Canadian Flag Association | In English | → Associations → 9299 |
| CFAO | Conception et Fabrication Assistées par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| CFAR | Collège Français des Anesthésistes Réanimateurs | In French | → Organizations and associations → Anesthesiology |
| CFC | Community Foundations of Canada = FCC | Fondations Communautaires du Canada | In French |
In English | → Foundations |
| CFC | Cuadernos de Filologia clásica | In Spanish | → Serial publications, periodicals → Philology |
| CFCG | Confédération Française du Commerce de Gros | In French | → Organizations and associations → Trade |
| CFCV | Collectif féministe contre le viol | In French | → Organizations and associations → Feminism |