| CNET | Centre National d'Études des Télécommunications | In French | → Telecommunications |
| CNET | Centre National d’Équipement Thermique | In French | → Energy economics |
| CNEVA | Centre National d'Études Vétérinaires et Alimentaires | In French | → Medicine → Agricultural sciences → Food technology |
| CNEVA | Centre National d'Études Vétérinaires et Animales | In French | → Zoology → Veterinary medicine |
| CNEXO | Centre National pour l'Exploitation des Océans | In French | → Marine research, oceanography → Fishing, hunting |
| CNFK | Campus Numérique Francophone de Kinshasa | In French | → Networks, communication |
| CNFM | Comité National Français de la Mécanique | In French | → Organizations and associations → Mechanical engineering |
| CNFME | Centre National de Formation aux Métiers de l'Eau | In French | → Hydrology → Environmental technology, water supply, waste management |
| CNFPP | Centre National de Formation et de Perfectionnement des Professeurs | In French | → Education |
| CNFPT | Centre National de la Fonction Publique Territoriale | In French | → Public administration, government → Education |
| CNFTSV | Centre National de Formation des Techniciens des Services Vétérinaires | In French | → Specialized or (poly)technical colleges → Agricultural sciences |
| CNG | Centre National de Génotypage (www.cng.fr) | In French | → Research institutes → Genetics |
| CNGR | Coordination Nationale de la Gauche Républicaine | In French | → Political parties and movements |
| CNHI | Cité Nationale de l'Histoire de l'Immigration | In French | → Museums → Migrations |
| CNHIM | Centre National Hospitalier d'Information sur le Médicament | In French | → Organizations and associations → Pharmacology, toxicology |
| CNI | Carte Nationale d'Identité | In French | → Public administration, government |
| CNI | Caisse Nationale de l'Industrie | In French | → Economics → Social welfare |
| CNIC | Commission Nationale d'Interprétation et de Conciliation | In French | → Organizations and associations → Law, jurisprudence |
| CNIEL | Centre National Interprofessionnel de l'Économie Laitière | In French | → Agricultural sciences |
| CNIG | Commission Nationale de l'Information Géographique | In French | → Geography |
| CNIH | Comité National Interprofessionnel de l'Horticulture | In French | → Horticulture |
| 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 |
| CNIM | Collège National de l'Information Médicale | In French | → Medicine |
| CNIPT | Comité National Interprofessionnel de la Pomme de Terre | In French | → Agricultural sciences |
| CNIR | Centre National d'Information Routière | In French | → Transport and postal services |
| CNIR | Centre National d’Ingénierie du Réseau | In French | → Electrical engineering |
| CNJA | Centre National des Jeunes Agriculteurs | In French | → Agricultural sciences |
| CNL | Confédération Nationale du Logement | In French | → Organizations and associations → Accommodation |
| CNL | Centre National des Lettres | In French | → Literature |
| CNL | Centre National du Livre | In French | → Graphic industries, printing, publishing → Literature |
| CNMA | Caisse Nationale de crédit Mutuel Agricole | In French | → Banks → Agricultural sciences |
| CNMCCA | Confédération Nationale de la Mutualité, de la Coopération et du Crédit Agricole | In French | → Organizations and associations → Insurance → Agricultural sciences |
| CNMHS | Caisse Nationale des Monuments Historiques et des Sites | In French | → Public administration, government → History |
| CNMSS | Caisse Nationale Militaire de Sécurité Sociale | In French | → Public administration, government → Insurance |
| CNN | Compagnie Nationale de Navigation | In French | → Transport and postal services |
| CNOSF | Comité National Olympique et Sportif Français | In French | → Sport, physical exercises |
| CNOUS | Centre National des Œuvres Universitaires et Scolaires | In French | → Social welfare → Education |
| CNP | Conseil National des Programmes | In French | |
| CNP | Compagnie Navale des Pétroles | In French | → Transport and postal services → 665 |
| CNP | Caisse Nationale de Prévoyance | In French | → Social welfare |
| CNPAC | Comite National de Prévention des Accidents de la Circulation | In French | |
| CNPE | Centre Nucléaire de Production d’Électricité | In French | → Nuclear technology → Electrical engineering |
| CNPEJ | Commission Nationale Paritaire de l'Emploi des Journalistes | In French | → Newspapers, journalism → Labour, labour economics |
| CNPF | Conseil National du Patronat Français | In French | → Organizations and associations → Labour, labour economics |
| CNPF | Centre National du Patronat Français | In French | → Economics |
| CNPI | Centre National de Promotion des Investissements | In French | → 33972 |
| CNPL | Centre National de Pastorale Liturgique | In French | → Religion, theology → Music |
| CNPL | Comité Nautique du Pays de Lorient | In French | |
| CNPL | Chambre Nationale des Professions libérales | In French | → Organizations and associations |
| CNPP | Centre National de Prévention et de Protection | In French | |
| CNPSA | Centre National pour la Promotion Sociale des Aveugles | In French | |
| CNR | Conservatoire National de Région | In French | → Music |
| CNR | Compagnie Nationale du Rhône | In French | |
| CNR | Centre National de Rugby | In French | → Football and rugby |
| CNRA | Centre National de Recherche Agricole | In French | → Agricultural sciences |
| CNRA | Conseil National des Radios Associatives | In French | → Organizations and associations → Telecommunications |
| CNRACL | Caisse Nationale de Retraite des Agents des Collectivités Locales | In French | → Labour, labour economics → Public administration, government → Insurance |
| CNRB | Caisse Nationale de Retraite de la Batellerie | In French | → Labour, labour economics → Insurance → Transport and postal services |
| CNRD | Concours National de la Résistance et de la Déportation | In French | → Education → History |
| CNRM | Centre National de Recherche Météorologique | In French | → Meteorology, climatology |
| CNRS | Centre National de la Recherche Scientifique | In French | → Research policy → Mathematics and natural sciences |
| CNRST | Centre National pour la Recherche Scientifique et Technique | In French | → Mathematics and natural sciences → Applied sciences, technology |
| 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 | Centre National de Séquençage | In French | → Genetics |
| CNS2T | Communication, Navigation et Surveillance pour les Transports Terrestres | In French | → Transport and postal services |
| CNSAD | Conservatoire National Supérieur d'Art Dramatique | In French | → Specialized or (poly)technical colleges → Theatre → Dance |
| CNSMDP | Conservatoire National Supérieur de Musique et de Danse de Paris | In French | → Specialized or (poly)technical colleges → Music → Dance |
| CNSP-ARP | Conseil National Supérieur Professionnel des Agents de Recherches Privées | In French | |
| CNSS | Caisse Nationale de Sécurité Sociale | In French | → Central administration → Insurance |
| CNSTB | Conseil National de la Sous-Traitance du Bâtiment | In French | → Organizations and associations → Building |
| CNT | Caisse Nationale des Télécommunications | In French | → Telecommunications |
| CNTC | Centre National des Technologies et du Consulting | In French | |
| CNTS | Centre National de Transfusion Sanguine | In French | → Blood and circulatory system → Pharmacology, toxicology |
| CNU | Conseil National des Universités | In French | → Higher education, universities |
| CNUCED | Conférence des Nations Unies sur le Commerce et le Développement (www.unctad.org) = UNCTAD | United Nations Conference on Trade and Development | In English = ЮНКТАД | Конференция на ООН за търговия и развитие | In Bulgarian = CNUCYD | Conferencia de las Naciones Unidas sobre Comercio y Desarrollo | In Spanish = KUNKD | Konferenco de la Unuiĝintaj Nacioj pri Komerco kaj Disvolvado | In Esperanto = UNCTAD | გაეროს ვაჭრობისა და განვითარების კონფერენცია | In Georgian = UNCTAD | การประชุมสหประชาชาติว่าด้วยการค้าและการพัฒนา | In Thai = UNCTAD | 聯合國貿易及發展委員會 | In Chinese = ICTR | International Criminal Tribunal for Rwanda | In English = TPIR | Tribunal Penal Internacional para Ruanda | In Spanish = TPIR | Tribunal Pénal International pour le Rwanda | In French = MTKR | Międzynarodowy Trybunał Karny dla Rwandy | In Polish = MTTR | Medzinárodný Trestný Tribunál pre Rwandu | In Slovak |
In French | → United Nations → Trade → Development |
| CNUCED | Conférence des Nations-Unies pour le Commerce et le Développement | In French | → International relations → Trade |
| CNUDCI | Commission des Nations Unies pour le Droit Commercial International (www.uncitral.org) = UNCITRAL | United Nations Commission on International Trade Law | In English = ЮНСИТРАЛ | Комиссия Организации Объединенных Наций по праву международной торговли | In Russian = CNUDMI | Comisión de las Naciones Unidas para el Derecho Mercantil Internacional | In Spanish = NTU | Natsionalna Telekompaniya Ukraïny | In Ukrainian = НТУ | Національна Телекомпанія України | In Ukrainian |
In French | → United Nations → International law → Commercial law |
| CNUED | Conférence des Nations Unies sur l'Environnement et le Développement | In French | → Development → United Nations → Nature, |
| CNUEH | Centre des Nations Unies pour les Établissements Humains = UNCHS | United Nations Centre for Human Settlements | In English = CNUAH | Centro de las Naciones Unidas para los Asentamientos Humanos | In Spanish = CNUAH | Centro das Nações Unidas sobre Assentamentos Humanos | In Portuguese |
In French | → United Nations → Accommodation |
| COB | Cercle Océanaute de Bordeaux | In French | → Organizations and associations → Sport, physical exercises |
| COB | Club Olympique de Billancourt | In French | → Organizations and associations → Sport, physical exercises |
| COB | Club Olympique de Bamako | In French | → Organizations and associations → Sport, physical exercises |
| COB | Commission des Opérations de Bourse (www.cob.fr) | In French | → Finance |
| COBA | Cost Benefit Analysis | In French | → Prices |
| CoCAC | Conseiller de Coopération et d'Action Culturelle | In French | → International relations → Civilization, culture, progress → Arts |
| COD | Complément d'Objet Direct | In French | → Language, linguistics, literature |
| CODATU | COnférence sur le Développement et l'Aménagement des Transports Urbains pour les pays en développement | In French | → Transport and postal services |
| CODEC | Comité Départemental d'Examen des Comptes des Organismes de Sécurité Sociale | In French | → Public administration, government → Insurance |
| CODEFI | Comité Départemental pour le Financement des Entreprises | In French | → Insurance |
| CODERPA | Comité Départemental des Retraites et Personnes Agées | In French | → Labour, labour economics → Insurance |
| CODEV | COopération et DÉVeloppement | In French | → Organizations and associations → Development |
| CODEVI | COmpte pour le DEVeloppement Industriel | In French | → Finance |
| CODINORM | Côte d'Ivoire Normalisation | In French | → Standardization |
| CODIS | Centre Opérationnel Départemental d'Incendie et de Secours | In French | → Public administration, government |
| COE | Conseil d'Orientation pour l'Emploi | In French | → Labour, labour economics |
| COFACE | Compagnie Française d'Assurance pour le Commerce Extérieur | In French | → Trade |
| COFIPAC | Compagnie Française d'Investissement, de Participation, d'Assistance et de Coopération | In French | → Economics |
| COFRAC | Comité Français d'Accréditation | In French | |
| COFRAS | Compagnie Française d'Assistance Spécialisée | In French | → Social welfare |
| COGAC | COmpagnie Gazière d’Approvisionnement Charbonnier | In French | → Energy economics → Mining → Chemical technology |
| COGECOM | Compagnie Générale de Communications | In French | → Telecommunications |
| COGEMA | Compagnie Générale des Matières Nucléaires | In French | → Mining → Nuclear technology |
| COGEPA | Compagnie Générale de Participation | In French | → Economics |
| COGETHERM | COmpagnie française pour la coGÉnération THERMique | In French | → Energy economics → Electrical engineering |
| COI | Complément d'Objet Indirect | In French | → Language, linguistics, literature |
| COI | Commission de l'Océan Indien (www.coi-ioc.org) = IOC | Indian Ocean Commission | In English |
In French | → International relations |
| CoIAP | Contributions de l'Institut d'Astrophysique de Paris | In French | → Serial publications, periodicals → Astronomy |
| COJESKI | Collectif des Organisations des Jeunes Solidaires du Congo-Kinshasa | In French | → Organizations and associations |
| COJO | Comité d'Organisation des Jeux Olympiques | In French | → Sport, physical exercises |
| COLITRAH | Comité de Liaison pour le Transport des Personnes Handicapées | In French | → Medicine → Transport and postal services |
| COLO | Club Opportunité des Logiciels Ouverts | In French | → Software |
| COMAC | Comité d’Action Militaire | In French | → 355 |
| COMES | Commissariat à l'Énergie Solaire | In French | → Energy economics |
| COMORE | Contrôle et Modélisation de Ressources Renouvelables | In French | → Computer science → Nature |
| COMT | Commission des Marchés à Terme de Marchandises | In French | → Finance → Trade |
| CONAP | Confédération des Nationalités Amazoniennes du Pérou = CONAP | Confederación de Nacionalidades Amazónicas del Perú | In Spanish = CONAP | Confederation of Amazonian Nationalities of Peru | In English = CONAP | Confederação das Nações Amazônicas do Peru | In Portuguese = ICISS | International Commission on Intervention and State Sovereignty | In English = CIISE | Commission Internationale de l'Intervention et de la Souveraineté des États | In French |
In French | → Organizations and associations |
| CoORB | Communications de l'Observatoire Royal de Belgique | In French | → Serial publications, periodicals → Astronomy |
| 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 |
| COPENOR | Compagnie Pétrochimique du Nord | In French | → Chemical technology |
| COPRIN | Contraintes, OPtimisation et Résolution par INtervalles | In French | → Mathematics |
| COPS | Comité politique et de sécurité | In French | → Politics → 355 |
| CORAF | Conférence de Responsables de Recherche Agronomique Africains | In French | → Organizations and associations → Agricultural sciences |
| COREM | Comité de Coordination des Centres de Recherches en Mécanique | In French | → 531 → Mechanical engineering |
| CORESSA | Compagnie de Restauration et de Services Aéroportuaires | In French | → 64 → Transport and postal services |
| CORINE | Coordination des Informations sur l'Environnement | In French | → Nature → Environment, environmental sciences |
| CORRI | Comité Régional de Restructuration Industrielle | In French | → Engineering, technology → Regional planning |
| CORTECHS | Convention de formation pour les techniciens supérieurs | In French | → Education |
| COS | Comité d'Orientation Scientifique | In French | → Mathematics and natural sciences |
| COS | Comité des Oeuvres Sociales | In French | → Social welfare |
| COS | Coefficient d'Occupation des Sols | In French | → Accommodation → Regional planning |
| COS | Complément d'Objet Second | In French | → Language, linguistics, literature |
| COSEC | Complexe Sportif Évolutif Couvert | In French | → Sport, physical exercises |
| COSI | Comité Ouvrier de Secours Immédiat | In French | → Organizations and associations |
| COSIP | Compte de Soutien à l'Industrie des Programmes | In French | → Cinema, movies → Theatre |
| COSIP | Commission du compte de soutien à l’industrie des programmes | In French | → Cinema, movies |
| COSL | Comité Olympique et Sportif Luxembourgeois | In French | → Organizations and associations → Sport, physical exercises |
| COSOR | Comité des Œuvres Sociales de la Résistance | In French | → Organizations and associations → Social welfare → History |
| COSSE | Comité pour la Sauvegarde de la Santé et de l'Environnement | In French | → Nature → Medicine |
| COTAM | Commandement du Transport Aérien Militaire | In French | → Public administration, government → Military engineering → Transport and postal services |
| COTEFE | Comité Technique de coordination de la Filière Électronique | In French | → Electronics |
| COTOREP | Commission Technique d'Orientation et de Reclassement Professionnel | In French | → Labour, labour economics → Public administration, government |
| CoUCL | Contributions de l'Universite Catholique de Louvain | In French | → Serial publications, periodicals → Roman catholic church → Higher education, universities |
| COV | Certificat d'Obtention Végétale | In French | → Agricultural sciences |
| COVESAR | Comptoir de Vente des Charbons Sarrois | In French | |
| COVNM | Composés Organiques Volatils Non Méthaniques | In French | → Nature → Environment, environmental sciences |
| CP | Certificat Préparatoire | In French | → Education |
| CPA | Centre de Perfectionnement aux Affaires | In French | → Economics → Education |
| CPA | Cessation Progressive d'Activité | In French | → Labour, labour economics |
| CPA | Cellule Présentatrice d'Antigène | In French | → Biological sciences |
| CPC | Coût Par Clic | In French | → 6591 |
| CPC | Commission Parlementaire Conjointe = CPC | Comisión Parlamentaria Conjunta | In Spanish = CPC | Comissão Parlamentar Comum | In Portuguese |
In French | → Parliaments, representation |
| CPCAM | Caisse Primaire Centrale d'Assurance-Maladie | In French | → Insurance → Medicine |
| CPCAMRP | Caisse Primaire Centrale d'Assurance-Maladie de la Région Parisienne | In French | → Insurance → Medicine |
| CPCEA | Caisse de Prévoyance des Cadres d'Exploitations Agricoles | In French | → Insurance → Agricultural sciences |
| CPCET | Centre de Pharmacologie Clinique et d'Évaluations Thérapeutiques | In French | → Organizations and associations → Pharmacology, toxicology |
| CPCG | Chromatographie en Phase Gazeuse Capillaire | In French | → Chromatography, mass spectrography |
| CPCI | Commission Permanente de Concertation pour l'Industrie | In French | → Industry, industrial policy |
| CPDH | Comité Professionnel de Développement de l'Horlogerie | In French | → 681 |
| CPE | Contrat Première Embauche | In French | → Labour, labour economics |
| CPEG | Certificat Préparatoire aux Études de Gestion | In French | → Economics → Education |
| CPER | Contrat de Plan État-Région | In French | → Public administration, government |
| CPER | Contrat de Projets État/Région | In French | → Public administration, government |
| CPER | Contrats de plan État-région | In French | → Internal policy → Public administration, government |
| CPF | Classification des Produits Française | In French | |
| CPG | Chromatographie en Phase Gazeuse | In French | → Chromatography, mass spectrography |
| CPGE | Classe Préparatoire aux Grandes Écoles | In French | → Education |
| CPGE | Classes Préparatoires aux Grandes Écoles | In French | → Education |
| CPH | Centre de Physique des Houches | In French | → Serial publications, periodicals → Physics |
| CPI | Cour Pénale Internationale = ICC | International Criminal Court | In English |
In French | → Law, jurisprudence |
| CPI | Centre de Promotion des Investissements | In French | → 33972 |
| CPI | Cycle Préparatoire Intégré | In French | → Education |
| CPL | Courant Porteur en Ligne | In French | → Electrical engineering → Telecommunications |
| CPL | Chromatographie en Phase Liquide | In French | → Chromatography, mass spectrography |
| CPLD | Conseil de Prévention et de Lutte contre le Dopage | In French | → Sport, physical exercises |
| CPM | Coût Pour Mille affichages | In French | → 6591 |
| CPN | Commission Pédagogique Nationale | In French | → Education |
| CPNAMB | Caisse Primaire Nationale d'Assurance-Maladie de la Batellerie | In French | → Insurance → Medicine → Transport and postal services |
| CPNEF/AV | Commission Paritaire Nationale de l'Emploi et de la Formation dans l'Audiovisuel | In French | → Labour, labour economics → Cinema, movies → Telecommunications |
| CPNT | Chasse, Pêche, Nature, Traditions | In French | → Political parties and movements |
| CPP | Cycle Préparatoire Polytechnique | In French | → Education |
| CPP | Code de procédure pénale | In French | → Law, jurisprudence |
| CPP | Commission Psycho-Pédagogique | In French | → Psychology → Education |
| CPPN | Classe Pré-Professionnelle de Niveau | In French | → Labour, labour economics → Education |
| CPPOSS | Caisse de Prévoyance du Personnel des Organismes Sociaux et Similaires | In French | → Insurance |
| CPSM | Caisse de Protection Sociale de Mayotte | In French | → Insurance |
| CPST | Cahier des Prescriptions et Spécifications Techniques | In French | → Engineering, technology |
| CPT | Centre de Production Thermique | In French | → Electrical engineering |
| CPU | Collège Polytechnique Universitaire | In French | → Specialized or (poly)technical colleges → Engineering, technology |
| CPU | Conférence des Présidents d'Université | In French | → Higher education, universities |
| CPVE | Conseil Parisien de la Vie Étudiante | In French | |
| CQEL | Cellule Qualité des Eaux Littorales | In French | → Hydrology → 55156 |
| CQFD | Ce Qu'il Fallait Démontrer = QED | Quod Erat Demonstrandum | In Latin |
In French | → Science and knowledge |
| CQFH | Comité sur les Questions Financières de l'Hémisphère = CAFH | Comité de Asuntos Financieros Hemisféricos | In Spanish = CAFH | Comitê de Assuntos Financeiros no Hemisfério | In Portuguese = CHFI | Committee on Hemispheric Financial Issues | In English |
In French | → Finance → International economic cooperation |
| CQG | Comité Qualité Gestion | In French | → Quality management |
| CRA | Centre de Rétention Administrative | In French | → Law, jurisprudence |
| CRA | Cédants et Repreneurs d'Affaires | In French | → Economics |
| CRABS | Comptes-Rendus de l'Académie Bulgare des Sciences | In French | → Serial publications, periodicals → Mathematics and natural sciences |