| CHJ | Conference of Historical Journals | In English | → Serial publications, periodicals → History |
| CHLA | Canadian Health Libraries Association = ABSC | Association des Bibliothèques de la Santé du Canada | In French |
In English | → Libraries → Associations → Medicine |
| CHRC | Cito - Harten Rijn Combinatie | In Dutch | → Sport, physical exercises |
| CHUS | Chinese Historians in the United States | In English | → History |
| CIBT | Conseil International des Bois Tropicaux | In French | → Timber and woodworking industry |
| CIC | Centre d'Investigations Cliniques | In French | → Pharmacology, toxicology |
| CIC | Centro Internazionale Crocevia | In Italian | |
| CICAE | Confédération Internationale des Cinémas d'Art et d'Essai (www.art-et-essai.org/cicae/) | In French | → Cinema, movies |
| CICESE | Centro de Investigación Científica y de Educación Superior de Ensenada (www.cicese.mx) | In Spanish | → Research institutes → Research policy → Higher education, universities |
| CICF | Confédération des Industries Céramiques de France | In French | → 666 |
| CICF | Chambre des Ingénieurs-Conseil de France | In French | → Engineering, technology |
| CICI | Commission Internationale de Coopération Intellectuelle | In French | → International relations |
| CICLIM | Coordination Internationale des Chercheurs sur les Littératures du Maghreb | In French | → Literature |
| CICP | Cambodian Institute for Cooperation and Peace (www.cicp.org.kh) | In English | → Research institutes → Democracy → Internal policy → International relations |
| CICR | Comitât entèrnacionâl de la Crouèx-Roge (www.icrc.org) = CICR | Comité Internacional de la Cruz Roja | In Spanish = ICRC | International Committee of the Red Cross | In English = CICR | Comité International de la Croix-Rouge | In French = CICV | Comitê Internacional da Cruz Vermelha | In Portuguese = МККК | Международный комитет Красного Креста | In Russian = SSKK | Starptautiskā Sarkanā Krusta Komiteja | In Latvian = CICR | Comitato Internazionale della Croce Rossa | In Italian = ICRC | 적십자 국제 위원회 | In Korean = CICR | Comitè Internacional de la Creu Roja | In Catalan |
In Franco-Provençal | → Medicine |
| CICR | Comitè Internacional de la Creu Roja (www.icrc.org) = ICRC, CICV, МККК, SSKK (look above) |
In Catalan | → Medicine |
| CICR | Comité Internacional de la Cruz Roja (www.icrc.org) = ICRC, CICV, МККК, SSKK (look above) |
In Spanish | → Medicine |
| CICR | Comitato Internazionale della Croce Rossa (www.icrc.org) = ICRC, CICV, МККК, SSKK (look above) |
In Italian | → Medicine |
| CICR | Comité International de la Croix-Rouge (www.icrc.org) = ICRC, CICV, МККК, SSKK (look above) |
In French | → Medicine |
| CICTE | Comitê Interamericano de Combate ao Terrorismo = CICTE | Comisión Interamericana contra el Terrorismo | In Spanish |
In Portuguese | → Polemology |
| CICTE | Comisión Interamericana contra el Terrorismo = (look above) |
In Spanish | → Polemology |
| CICV | Comitê Internacional da Cruz Vermelha (www.icrc.org) = CICR, ICRC, МККК, SSKK (look above) |
In Portuguese | → Medicine |
| CIDA | Confederazione Italiana Dirigenti d'Azienda | In Italian | → Labour, labour economics |
| CIDEC | Centro Interdisciplinario de Estudios Culturales | In Spanish | → Research institutes → Civilization, culture, progress |
| CIDI | Conselho Interamericano para o Desenvolvimento Integral = CIDI | Consejo Interamericano para el Desarrollo Integral | In Spanish = CIDI | Conseil interaméricain pour le Développement Intégré | In French |
In Portuguese | → International relations → Development |
| CIDI | Conseil interaméricain pour le Développement Intégré = (look above) |
In French | → International relations → Development |
| CIDI | Consejo Interamericano para el Desarrollo Integral = (look above) |
In Spanish | → International relations → Development |
| CIDIS | Centro di Informazione, Documentazione e Iniziativa per lo Sviluppo | In Italian | → Libraries → Development |
| CIDPDD | Centre International des Droits de la Personne et du Développement Démocratique (www.ichrdd.ca) = ICHRDD | International Centre for Human Rights and Democratic Development | In English |
In French | → Fundamental rights → Democracy |
| CIDS | Comisión Interamericana de Desarrollo Sostenible = CIDS | Commission Interaméricaine pour le Développement Durable | In French = CIDS | Comissão Interamericana de Desenvolvimento Sustentável | In Portuguese |
In Spanish | → International relations → Development |
| CIDS | Commission Interaméricaine pour le Développement Durable = (look above) |
In French | → International relations → Development |
| CIDS | Comissão Interamericana de Desenvolvimento Sustentável = (look above) |
In Portuguese | → International relations → Development |
| CIDUNATI | Confédération Intersyndicale de Défense et d'Union Nationale des Travailleurs Indépendants | In French | → Labour, labour economics |
| CIE | Conférence Islamique Européenne | In French | → Islam |
| CIES | Centro Informazione ed Educazione allo Sviluppo | In Italian | → Education → Development |
| CIESIN | Center for International Earth Science Information Network | In English | → Research institutes → Earth sciences |
| CIESM | Commission Internationale pour l'Exploration Scientifique de la mer Méditerranée | In French | → Marine research, oceanography |
| CIESS | Centro Interamericano de Estudios de Seguridad Social = CIESS | Centro Interamericano de Estudos sobre Segurança Social | In Portuguese |
In Spanish | → Insurance |
| CIESS | Centro Interamericano de Estudos sobre Segurança Social = (look above) |
In Portuguese | → Insurance |
| CIF | Commission Interaméricaine des Femmes (www.oas.org/cim/) = CIM | Comisión Interamericana de Mujeres | In English = IACW | Inter-American Commission of Women | In English = CIM | Comissão Interamericana de Mulheres | In Portuguese |
In French | → Feminism |
| CIFA | Committee for Inland Fisheries of Africa | In English | → Fishing, hunting |
| CIG | Confederación Intersindical Galega | In Spanish | → Labour, labour economics |
| CIGOS | Canadian Interest Group on Open Systems | In English | → Computer science |
| CIGRE | Conférence Internationale des Grands Réseaux Électriques à haute tension | In French | → Electrical engineering |
| CIGREF | Club Informatique des Grandes Entreprises Françaises | In French | → Computer science |
| CIHAM | Centre Interuniversitaire d'Histoire et d'Archéologie Médiévales | In French | → Research institutes → Archeology → History |
| CIHEAM | Centre International des Hautes Études Agronomiques Méditerranéennes (www.ciheam.org) | In French | → Research institutes → Agricultural sciences |
| CIHEF | Commission Internationale Humanitaire d'Établisssement des Faits (www.ihffc.org) = IHFCC | International Humanitarian Fact-Finding Commission | In English |
In French | → International law |
| CIHR | Canadian Institutes of Health Research (www.cihr.ca) = IRSC | Instituts de recherche en santé du Canada | In French |
In English | → Research institutes → Biological sciences → Medicine |
| CIID | Commission Internationale pour les Irrigations et le Drainage = ICID | International Commission for Irrigation and Drainage | In English |
In French | → 627 → Agricultural sciences |
| CIINB | Commission Interministérielle des Installations Nucléaires de Base | In French | → Central administration → Nuclear technology |
| CIIT | Chemical Industry Institute of Toxicology | In English | → Research institutes → Pharmacology, toxicology → Chemical technology |
| CIJEF | Conseil International des organisations de Jeunes de la Francophonie | In French | |
| CIJV | Centre International Jules-Verne (www.cijv.fr) | In French | → Museums → Literature |
| CIKTN | Chemistry Innovation Knowledge Transfer Network | In English | → Chemistry |
| CILT | Center for Information on Language Teaching and Research (www.cilt.org.uk) | In English | → Education → Language, linguistics, literature |
| CIM | Comisión Interamericana de Mujeres (www.oas.org/cim/) = CIF, IACW (look above) |
In English | → Feminism |
| CIM | Comissão Interamericana de Mulheres (www.convenioandresbello.org) = CIF, IACW (look above) |
In Portuguese | → Feminism |
| CIMAC | Conseil International des Machines à Combustion | In French | → Mechanical engineering |
| CIMADE | Comité Inter-Mouvements Auprès Des Évacués | In French | → 3417 |
| CIME | Comité d’Information et de Mobilisation pour l’Emploi | In French | → Labour, labour economics |
| CIMLS | Cercle Informatique Médicale entre Lesse et Semois | In French | → Computer science → Medicine |
| CIMP | Commision Internationale de Microflore Paléozoique | In English | → Paleobotany, palynology → Botany |
| CIMR | Cambridge Institute for Medical Research | In English | → Research institutes → Medicine |
| CIN | Conferência Internacional sobre Nutrição = CIN | Conferencia Internacional sobre Nutrición | In Spanish = ICN | International Conference on Nutrition | In English = CIN | Conférence Internationale sur la Nutrition | In French |
In Portuguese | → Congresses → Nutrition |
| CIN | Conferencia Internacional sobre Nutrición = ICN (look above) |
In Spanish | → Congresses → Nutrition |
| CINVESTAV | Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (www.cinvestav.mx) | In Spanish | → Research institutes → Specialized or (poly)technical colleges |
| CIO | Comité International Olympique (www.olympic.org) = IOC | International Olympic Committee | In English = МОК | Международен олимпийски комитет | In Bulgarian = MOO | Međunarodni olimpijski odbor | In Bosnian = COI | Comitè Olímpic Internacional | In Catalan = MOV | Mezinárodní olympijský výbor | In Czech = IOK | Internationales Olympisches Komitee | In German = ΔΟΕ | Διεθνής Ολυμπιακή Επιτροπή | In Greek = IOK | Internacia Olimpika Komitato | In Esperanto = COI | Comité Olímpico Internacional | In Spanish = ROK | Rahvusvaheline Olümpiakomitee | In Estonian = KOK | Kansainvälinen olympiakomitea | In Finnish = COI | Comité Olímpico Internacional | In Galician = MOO | Međunarodni olimpijski odbor | In Croatian = NOB | Nemzetközi Olimpiai Bizottság | In Hungarian = TOK | Tarptautinis olimpinis komitetas | In Lithuanian = IOC | Internationaal Olympisch Comité | In Dutch = IOK | (Den) internasjonale olympiske komité | In Norwegian = MKOI | Międzynarodowy Komitet Olimpijski | In Polish = COI | Comité Olímpico Internacional | In Portuguese = МОК | Международный олимпийский комитет | In Russian = MOK | Međunarodni olimpijski komitet | In Serbo-Croatian = MOV | Medzinárodný olympijský výbor | In Slovak = MOK | Mednarodni olimpijski komite | In Slovenian = МОК | Међународни олимпијски комитет | In Serbian = IOK | Internationella Olympiska Kommitté | In Swedish = МОК | Міжнародний олімпійський комітет | In Ukrainian |
In French | → Sport, physical exercises |
| CION | Chevron Is Onze Naam | In Dutch | → Sport, physical exercises |
| CIOSL | Confederación Internacional de Organizaciones Sindicales Libres (www.icftu.org) = CISL | Confédération Internationale des Syndicats Libres | In French = ICFTU | International Confederation of Free Trade Unions | In English = CIOSL | Confederação Internacional de Organizações Sindicais Livres | In Portuguese = ICB | International Criminal Bar | In English = BPI | Barreau Pénal International | In French |
In Spanish | → Labour, labour economics |
| CIOSL | Confederação Internacional de Organizações Sindicais Livres (www.icftu.org) = CISL, ICFTU, ICB, BPI (look above) |
In Portuguese | → Labour, labour economics |
| CIPFG | Coalition d'Investigation sur la Persécution du Falun Gong en Chine | In French | → Modern spiritual movements |
| CIPUF | Carrefour International de la Presse Universitaire Francophone (www.cipuf.org) | In French | → Newspapers, journalism → Higher education, universities |
| CIRDN | Comitê Interamericano sobre a Redução de Desastres Naturais = CIRDN | Comité Interamericano para la Reducción de los Desastres Naturales | In Spanish = IACNDR | Inter-American Committee on Natural Disaster Reduction | In English |
In Portuguese | → Natural disasters |
| CIRDN | Comité Interamericano para la Reducción de los Desastres Naturales = IACNDR (look above) |
In Spanish | → Natural disasters |
| CIRED | Centre International de Recherches sur l'Environnement et le Développement | In French | → Research institutes → Nature → Agricultural sciences |
| CIRESS | Colloque International sur les Ressources en Eau Souterraines dans le Sahara | In French | → Congresses → Hydrology |
| CIRESS | Centre Interdisciplinaire de Recherches et d'Études sur les Systèmes Sociaux | In French | → Social sciences |
| CIRHAC | Centre Inter-universitaire de Recherche en Histoire de l’Art Contemporain | In French | → Research institutes → History |
| CIRIA | Construction Industry Research and Information Association | In English | → Building |
| CIRIEC | Centre International de Recherches et d'Information sur l'Économie Publique, Sociale et Coopérative = IFIG | Internationales Forschungs- und Informationszentrum für öffentliche Wirtschaft, Sozialwirtschaft und Genossenschaftswesen | In German |
In French | → Economics |
| CIS | Commissione Italiana di Stratigrafia | In Italian | → Earth sciences |
| CISAB | Center for the Integrative Study of Animal Behavior | In English | → Zoology |
| CISAL | Confederazione Italiana Sindacati Autonomi Lavoratori | In Italian | → Labour, labour economics |
| CISAS | Confederazione Italiana Sindicati Addetti ai Servizi | In Italian | → Labour, labour economics |
| CISL | Confederazione Italiana Sindacati Lavoratori | In Italian | → Labour, labour economics |
| CISL | Confédération Internationale des Syndicats Libres (www.icftu.org) = CIOSL, ICFTU, ICB, BPI (look above) |
In French | → Labour, labour economics |
| CISM | Conseil International du Sport Militaire | In French | → 355 → Sport, physical exercises |
| CISMA | Conférence Internationale sur le Sida et les Maladies sexuellement transmissibles en Afrique | In French | → Infectious diseases |
| CISP | Comitato Internazionale per lo Sviluppo dei Popoli | In Italian | |
| CISPEL | Confederazione Italiana dei Servizi Pubblici degli Enti Locali | In Italian | → Municipal administration |
| CISS | Conferencia Interamericana de Seguridad Social | In Spanish | → Insurance |
| CISS | Cooperazione Internazionale Sud-Sud | In Italian | |
| CISV | Comunità Impegno Servizio Volontariato | In Italian | |
| CITEL | Commission Interaméricaine des Télécommunications = CITEL | Comisión Interamericana de Telecomunicaciones | In Spanish = CITEL | Comissão Interamericana de Telecomunicações | In Portuguese |
In French | → Telecommunications |
| CITEL | Comissão Interamericana de Telecomunicações = (look above) |
In Portuguese | → Telecommunications |
| CITEL | Comisión Interamericana de Telecomunicaciones = (look above) |
In Spanish | → Telecommunications |
| CITI | Centre d’Innovation en Télécommunications et Intégration de services | In French | → Research institutes → Telecommunications |
| CITIC | Centro Andaluz de Innovación y Tecnologías de la Información y las Comunicaciones (www.citic.es) | In Spanish | → Research institutes → Computer science → Telecommunications |
| CITS | Croatian Information Technology Society | In English | → Computer science → Telecommunications |
| CIU | Club International Universitaire | In French | → Higher education, universities |
| CIU | Comitato Italiano per l'UNICEF | In Italian | |
| CIU | Consorzio Interprovinciale Universitario | In Italian | → Higher education, universities |
| CIVAM | Centre d’Initiative pour Valoriser l’Agriculture et le Milieu rural | In French | → Agricultural sciences |
| CJA | Christlich-Jüdische Arbeitsgemeinschaft Basel | In German | → Associations → Judaism → Christianity |
| CJD | Centre des Jeunes Dirigeants d'Entreprises | In French | → Economics |
| ĈJEA | Ĉina Junulara Esperanto-Asocio = ĈJEA | 中国における青年エスペラント団体です | In Japanese |
In Esperanto | → Associations |
| ĈJEA | 中国における青年エスペラント団体です = (look above) |
In Japanese | |
| CJSA | China Judaic Studies Association | In English | → Associations → Judaism → Language, linguistics, literature → Geography, biography, history |
| CJV | Christelijke Jongeren Vereniging | In Dutch | → Christianity |
| CJVV | Christelijke Jongelieden Voetbal Vereniging | In Dutch | → Christianity → Football and rugby |
| CKC | Capelle Kralingscheveer Combinatie | In Dutch | → Sport, physical exercises |
| CKC | Continental Kennel Club | In English | |
| CLA | Cantonese Language Association (http://asiane.byu.edu/cla/) | In English | → Associations → Education → Language, linguistics, literature |
| CLAAI | Confederazione delle Libere Associazioni Artigiane Italiane | In Italian | |
| CLAEH | Centro Latino-Americano de Economía Humana (www.claeh.org.uy) = CLAEH | Centre Latino-Américain d'Économie Humaine | In French = CLAEH | Centro Latino-americano de Economia Humana | In Portuguese |
In Spanish | → Research institutes → Economics |
| CLAEH | Centre Latino-Américain d'Économie Humaine (www.claeh.org.uy) = (look above) |
In French | → Research institutes → Economics |
| CLAEH | Centro Latino-americano de Economia Humana (www.claeh.org.uy) = (look above) |
In Portuguese | → Research institutes → Economics |
| CLAH | Conference on Latin American History | In English | → History |
| CLASS | Chinese Language Association for Secondary-Elementary Schools | In English | → Associations → Education → Linguistics |
| CLASS | Chinese Language Association for Secondary School (www.classk12.org) | In English | → Associations → Education → Language, linguistics, literature |
| CLC | Canadian Labour Congress = CTC | Congrès du Travail du Canada | In French |
In English | → Labour, labour economics |
| CLE | Comité Local d'Experts | In French | |
| CLEV | Culture, Loisirs, Entraide, Voyages | In French | |
| CLGE | Central Laboratory of General Ecology | In English | → Research institutes → Ecology |
| CLGE | Council of European Geodetic Surveyors | In English | → Geodesy, cartography |
| CLGE | Comité de Liaison des Géomètres Européens | In French | → Geodesy, cartography |
| CLIN | Comité de Lutte contre l'Infection Nosocomiale | In French | → Infectious diseases |
| CLMC | Comunità Laici Missionari Cattolici | In Italian | → Roman catholic church |
| CLORA | CLub des Organismes de Recherche Associés | In French | → Research policy |
| CLSJ | The Chinese Linguistic Society of Japan | In English | → Linguistics |
| CLTA | Chinese Language Teachers' Association | In English | → Associations → Education → Language, linguistics, literature |
| CLTA | Chinese Language Teachers Association (http://clta-us.org) | In English | → Associations → Education → Language, linguistics, literature |
| CLTA-GNY | Chinese Language Teachers' Association of Greater New York | In English | → Associations → Language, linguistics, literature |
| CLTASA | Chinese Language Teachers' Association of South Australia | In English | → Associations → Education → Language, linguistics, literature |
| CLTAV | Chinese Language Teachers' Association of Victoria | In English | → Associations → Education → Language, linguistics, literature |
| CLTFA | Chinese Language Teachers' Federation of Australia | In English | → Education → Language, linguistics, literature |
| CLUD | Comité de Lutte contre La Douleur | In French | → Medicine |
| CLUW | Coalition of Labor Union Women | In English | → Labour, labour economics → Feminism |
| CMC | Centraal Missie Commissariaat | In Dutch | → Development |
| CME | Conseil Mondial de l'Énergie = CME | Consiliul Mondial al Energiei | In Romanian = WEC | World Energy Council | In English |
In French | → International relations → Energy economics |
| CME | Consiliul Mondial al Energiei = WEC (look above) |
In Romanian | → International relations → Energy economics |
| CME | Congrès Mondial de l’Énergie | In French | → Congresses → Energy economics |
| CMEAS | Consortium for Middle Eastern and African Studies | In English | → Language, linguistics, literature → Geography, biography, history |
| CMHS | Chinese Military History Society | In English | → History |
| CMM | Centre for Molecular Medicine | In English | → Research institutes → Medicine |
| CMM | Center for Molecular Medicine | In English | → Research institutes → Biochemistry, biophysics → Medicine |
| CMR | Colegiul Medicilor din România | In Romanian | → Medicine |
| CMSR | Centro Mondialità Sviluppo Reciproco | In Italian | → Development |
| CMSRSC | Maritime Silk Roads Study Centre | In English | → Research institutes → Transport and postal services |
| CMVR | Colegiul Medicilor Veterinari din România | In Romanian | → Veterinary medicine |
| CNA | Confederazione Nazionale dell'Artigianato e della Piccola e Media Impresa | In Italian | |
| CNASEA | Centre National pour l'Aménagement des Structures des Exploitations Agricoles | In French | → Agricultural sciences |
| CNBA | Chambre Nationale de la Batellerie Artisanale | In French | → Transport and postal services |
| CNBM | Confédération du Négoce de Bois et Matériaux | In French | → Trade → Timber and woodworking industry |
| CNC | Conseil National du Commerce | In French | → Trade |
| CNC | Conseil National de la Communication | In French | → 359 |
| CNC | Conseil National de la Comptabilité | In French | → Accounting |
| CNCSIS | Consiliu Naţional al Cercetării Ştiinţifice din Învăţământul Superior | In Romanian | → Research policy |
| CNDB | Centre National pour le Développement du Bois | In French | → Forestry |
| CNDCA | Comité National de Défense contre l'Alcoolisme | In French | → Medicine |
| CNDL | Conference of Directors of National Libraries | In English | → Libraries |
| CNFM | Comité National Français de la Mécanique | In French | → Mechanical engineering |
| CNG | Centre National de Génotypage (www.cng.fr) | In French | → Research institutes → Genetics |
| CNHI | Cité Nationale de l'Histoire de l'Immigration | In French | → Museums → Migrations |
| CNHIM | Centre National Hospitalier d'Information sur le Médicament | In French | → Pharmacology, toxicology |
| CNI | Coalition for Networked Information | In English | → Libraries |
| CNIC | Commission Nationale d'Interprétation et de Conciliation | In French | → Law, jurisprudence |
| CNIL | Commission Nationale Informatique et Libertés | In French | → Computer science → Fundamental rights |
| CNIM | Comitato Nazionale Italiano per la Manutenzione | In Italian | |
| CNIPMMR | Consiliul Naţional al Întreprinderilor Private Mici şi Mijlocii din România | In Romanian | |
| CNITV | Centre National d'Informations Toxicologiques Vétérinaires | In French | → Pharmacology, toxicology → Veterinary medicine |
| CNL | Confédération Nationale du Logement | In French | → Accommodation |
| CNMCCA | Confédération Nationale de la Mutualité, de la Coopération et du Crédit Agricole | In French | → Insurance → Agricultural sciences |
| CNNMN | Commision on New Minerals and Mineral Names | In English | → Mineralogy → Petrology |
| CNP | Confédération Nationale Paysanne | In English | → Agricultural sciences → History |
| CNPF | Conseil National du Patronat Français | In French | → Labour, labour economics |
| CNPL | Conselho Nacional das Profissões Liberais | In Portuguese | |
| CNPL | Canadian National Poker League | In English | → Entertainment |
| CNPL | Chambre Nationale des Professions libérales | In French | |
| CNPL | Conselho Nacional de Profissões Liberais | In Portuguese | |
| CNPL | Confederação Nacional das Profissões Liberais | In Portuguese | |
| CNPR | Confederaţia Naţională a Patronatului Român | In Romanian | → Labour, labour economics |
| CNRA | Conseil National des Radios Associatives | In French | → Telecommunications |
| CNRL | Communications and Navigation Research Laboratory | In English | → Research institutes → Telecommunications |
| CNS | Canadian Nuclear Society (www.cns-snc.ca) | In English | → Nuclear, atomic, and molecular physics → Nuclear technology |
| CNS | Computation and Neural Systems (www.cns.caltech.edu) | In English | → Research institutes → Artificial intelligence |
| CNS | Center for Nonproliferation Studies (http://cns.miis.edu) | In English | → Polemology → Military engineering |
| CNS | Cognitive Neuroscience Society (www.cogneurosociety.org) | In English | → Artificial intelligence → Psychology → Neurology |
| CNS | Congress of Neurological Surgeons (www.neurosurgeon.org) | In English | → Neurology → Surgery, orthopaedics, ophthalmology |
| CNS | Commission Nationale Skateboard (www.cns-france.com) | In French | → Sport, physical exercises |
| CNS | Conseil National du Sida (www.cns.sante.fr) | In French | → Infectious diseases |
| CNSTB | Conseil National de la Sous-Traitance du Bâtiment | In French | → Building |
| CNV | Christelijke Noordwijkerhoutse Voetbalclub | In Dutch | → Christianity → Football and rugby |
| COAL | Coal Overseas Association Limited | In English | → Associations |
| COB | Club Olympique de Bamako | In French | → Sport, physical exercises |
| COB | Club Olympique de Billancourt | In French | → Sport, physical exercises |
| COB | Cercle Océanaute de Bordeaux | In French | → Sport, physical exercises |
| CODEV | COopération et DÉVeloppement | In French | → Development |
| COE | Centro Orientamento Educativo | In Italian | → Education |