| ACF | Action contre la Faim | In French | → Development |
| ACF | Australian Cat Federation | In English | |
| ACF | Association of Charitable Foundations | In English | → Associations → Foundations |
| AcF | Akademie für christliche Führungskräfte | In German | → Academies → Christianity → Economics |
| ACF | Association des Casinos Francophones | In French | → Associations |
| ACFA | American Cat Fanciers Association | In English | → Associations → Food technology |
| ACFCdN | Association des Chemins de Fer des Côtes-du-Nord | In French | → Associations → Transport and postal services → Civil engineering and land transport |
| ACGA | An Comunn Gàidhealach Ameireaganach (www.acgamerica.org) | In Scottish Gaelic | → Language, linguistics, literature |
| ACGI | Associazione Generale Cooperative Italiane | In Italian | → Associations |
| ACGQ | Association des Chirurgiens Généraux du Québec | In French | → Associations → Surgery, orthopaedics, ophthalmology |
| ACHA | American Catholic Historical Association | In English | → Associations → Roman catholic church → History |
| ACHPR | African Commission on Human and Peoples' Rights | In English | → Fundamental rights |
| ACI | Automobile Club d'Italia | In Italian | → Automobile manufacturing → Transport and postal services |
| ACIAR | Australian Center for International Agriculture Research | In English | → Research institutes → Agricultural sciences |
| ACICA | Association de Coopération Islamique de la Communauté Africaine | In French | → Associations → Islam |
| ACICLA | Associação Comercial, Industrial e Agropecuária de Campo Largo | In Spanish | → Associations → Trade → Agricultural sciences |
| ACIF | Association Culturelle Internationale Francophone | In French | → Associations → Civilization, culture, progress |
| ACIF | Australian Construction Industry Forum | In English | → Building → Civil engineering |
| ACIF | Australian Communication Industry Forum | In English | → Telecommunications |
| ACIF | Associação Comercial e Industrial do Funchal | In Portuguese | → Associations → Industry, industrial policy → Trade |
| ACIF | Associação Comercial e Industrial de Florianópolis | In Portuguese | → Associations → Industry, industrial policy → Trade |
| ACIF | Addison & Cushing International Federation | In English | |
| ACIF | Associazione Consumatori Istruzione e Formazione | In Italian | → Associations → Education |
| ACIF | Association des Compagnons d'Île-de-France | In French | → Associations |
| ACIF | Asociación Colombiana de Ingenieros Forestales | In Spanish | → Associations → Forestry |
| ACIF | Academia Cultural Inglesa Florida | In Spanish | → Academies → Civilization, culture, progress |
| ACIS | American Conference for Irish Studies | In English | → Area studies |
| ACL | American Classical League (www.aclclassics.org) | In English | → Social sciences |
| ACLAM | American College of Laboratory Animal Medicine | In English | → Veterinary medicine |
| ACLVB | Algemene Centrale der Liberale Vakbonden = CGSLB | Centrale Générale des Syndicats Libéraux de Belgique | In French |
In Dutch | → Labour, labour economics |
| ACM | Association Of Computing Machinery | In English | → Computer science |
| ACMUR | Asociaţia Constructorilor de Maşini-Unelte din România | In Romanian | → Associations → Applied sciences, technology |
| ACNU | Association Canadienne pour les Nations Unies | In French | → Associations → United Nations |
| ACO | Arbeitsgemeinschaft für Chirurgische Onkologie | In German | → Associations → Oncology → Surgery, orthopaedics, ophthalmology |
| ACOB | Association française des fabricants de Charpentes en Béton (www.acob.net) | In French | → Associations → Building |
| ACOPHRA | Association Consultative et promotionnelle des Pharmaciens Hospitaliers de la région Rhône-Alpes | In French | → Pharmacology, toxicology |
| ACP | Arbeitsgemeinschaft für Coloproctologie | In German | → Associations → Pathology |
| ACP | Associação Comercial do Paraná | In Portuguese | → Associations → Trade |
| ACPA | Activated Carbon Producers Association | In English | → Associations → Chemicals |
| ACPCA | Arbitrage et Conciliation Pour le Cinéma et l'Audiovisuel | In French | → Cinema, movies |
| ACPI | Association des Conseils en Propriété Industrielle | In French | → Associations → Industrial property |
| ACPO | Association of Chief Police Officers | In English | → Associations → Public administration, government |
| ACPPHOS | Association Charentes Poitou des Pharmaciens Hospitaliers | In French | → Associations → Pharmacology, toxicology |
| ACPR | Association Culturelle Paul Renotte | In French | → Associations → Civilization, culture, progress |
| ACPR | Alianţei Confederaţiilor Patronale din România | In Romanian | → Labour, labour economics |
| ACR | American College of Radiology (www.acr.org) | In English | → Diagnostics |
| ACRA | Associazione di Cooperazione Rurale in Africa e America Latina | In Italian | → Associations → Development → Agricultural sciences |
| ACRL | Association of College and Research Libraries | In English | → Associations → Libraries |
| ACS | American Chemical Society | In English | → Chemistry |
| ACSEL | Association pour le Commerce et les Services en Ligne | In French | → Trade → Telecommunications |
| ACSM | American College of Sports Medicine | In English | → Medicine → Sport, physical exercises |
| ACT | American College of Theriogenologists | In English | |
| ACTA | Association de Coordination Technique Agricole | In French | → Associations → Agricultural sciences |
| ACTA | Association de Coopération Technique Agricole | In French | → Associations → Agricultural sciences |
| ACTFL | American Council on the Teaching of Foreign Languages (www.actfl.org) | In English | → Education → Language, linguistics, literature |
| ACTIA | Association de Coordination Technique pour l'Industrie Agro-Alimentaire | In French | → Associations → Agricultural sciences → Food technology |
| ACTIA | Association de Coordination Technique pour les Industries Agro-alimentaires | In French | → Associations → Agricultural sciences → Food technology |
| ACTIM | Agence pour la Coopération Technique, Industrielle et Économique | In French | → Economics |
| ACTIV | Association pour la Connaissance et la Transmission de l'Information en Volcanologie (www.activolcans.info) | In French | → Associations → 55121 |
| ACTP | Austrian Construction Technology Platform | In English | → Building |
| ACTR | American Council of Teachers of Russian | In English | → Education → Language, linguistics, literature |
| ACV | Association Canadienne de Vexillologie | In French | → Associations → 9299 |
| ACV | Asser Christelijke Voetbalclub | In Dutch | → Social sciences → Football and rugby |
| ACV | Associació Catalana de Vexillologia | In Spanish | → Associations → 9299 |
| ACV | Algemeen Christelijk Vakverbond = CSC | Confédération des Syndicats Chrétiens | In French |
In Dutch | → Labour, labour economics → Christianity |
| ACVA | American College of Veterinary Anesthesiologists | In English | → Veterinary medicine → Anesthesiology |
| ACVM | American College of Veterinary Microbiologists | In English | → Biological sciences → Veterinary medicine |
| ACVO | American College of Veterinary Ophthalmologists | In English | → Veterinary medicine |
| ACVPM | American College of Veterinary Preventive Medicine | In English | → Veterinary medicine |
| ACVR | American College of Veterinary Radiology | In English | → Veterinary medicine |
| ACVS | American College of Veterinary Surgeons | In English | → Veterinary medicine |
| ACVVV | Allevitische Culturele Voetbal Vereniging Venlo | In Dutch | → Football and rugby |
| ADA | American Diabetes Association | In English | → Associations → Pathology |
| ADA | American Dietetic Association | In English | → Associations → Nutrition |
| ADA | American Dental Association | In English | → Associations → Dentistry |
| ADAP | Associazione Doppiatori Attori Pubblicitari (www.adap.it) | In Italian | → Associations |
| ADARPEF | Association Des Anesthésistes Réanimateurs Pédiatriques d’Expression Française | In French | → Associations → Anesthesiology → Pediatry |
| ADASEA | Association Départementale pour l'Aménagement des Structures des Exploitations Agricoles | In French | → Associations → Economics |
| ADASTA | Association pour le Développement et l'Animation Scientifique et Technique en Auvergne | In French | → Associations → Mathematics and natural sciences → Engineering, technology |
| ADBDP | Association des Directeurs de Bibliothèques Départementales de Prêt | In French | → Associations → Libraries |
| ADBGV | Association des Directeurs de Bibliothèques municipales et intercommunales des Grandes Villes de France | In French | → Libraries |
| ADBU | Association des Directeurs et des personnels de direction de Bibliothèques Universitaires et de la documentation | In French | → Libraries |
| ADDIM | Association pour le Développement et la Diffusion de l'Information Militaire | In French | → Associations |
| ADDNB | Association pour le Développement des Documents Numériques en Bibliothèque | In French | → Associations → Libraries → Knowledge management |
| AdE | Akademio de Esperanto | In Esperanto | → Academies → Artificial languages (linguistics) |
| ADE | Alles Door Eendracht | In Dutch | → Sport, physical exercises |
| ADEAC | Agence pour le Développement de l'Esprit d'Aventure et de Conquête | In French | |
| ADEBAG | Association pour le Développement des Biotechnologies dans l'Agglomération Grenobloise | In French | → Associations → Biotechnology |
| ADEBD | Association des Diplômés de l’École de Bibliothécaires Documentalistes | In French | → Associations → Specialized or (poly)technical colleges → Libraries |
| ADEC | Association pour le Développement de l'Enseignement des Communications | In French | → Associations → Education |
| ADECA | Association pour le Développement des Carburants Agricoles (www.biocarburant.com) | In French | → Associations → Agricultural sciences → Chemical technology |
| ADEEC | Association pour le Développement des Entreprises Européennes par la Communication | In French | → Associations |
| ADEF | Association pour le Développement de l'Édition Française | In French | → Associations → Graphic industries, printing, publishing |
| ADEF | Association Des Exportateurs de Films (www.adef.fr) | In French | → Associations → Trade → Cinema, movies |
| ADEHPA | Association des Directeurs d'Établissements d'Hébergement pour Personnes Âgées | In French | → Associations → Gerontology → 649 |
| ADEIF | Association pour le Développement Européen de l'Île-de-France | In French | → Regional planning |
| ADELC | Association pour le Développement de la Librairie de Création | In French | → Associations → Graphic industries, printing, publishing → Graphic arts |
| ADELLA | Association pour le Développement des Logiciels Libres dans l'Aude | In French | → Associations → Software |
| ADEMAST | Association nationale pour le Développement et la Maîtrise des Sciences et des Technologies | In French | → Associations → Mathematics and natural sciences → Applied sciences, technology |
| ADEME | Agence de l'Environnement et de la Maîtrise de l'Énergie | In French | → Nature and society → Energy economics → Environmental technology, water supply, waste management |
| ADEP | Association pour le Développement de l'Enseignement Privé | In French | → Associations → Education |
| ADEPA | Association pour le Développement de la Production Automatisée | In French | → Associations → Engineering, technology |
| ADER | Association pour le Développement et la Recherche | In French | → Research policy → Associations |
| ADETEF | Association pour le Développement des Échanges en Technologies Économiques et Financières | In French | → Economics → Finance |
| ADETEF | Association pour le Développement des Échanges en Technologie Économique et Financière | In French | → Economics → Finance |
| ADETS | Association technique pour le Développement de l'Emploi du Treillis Soudé (www.adets.org) | In French | → Associations → Building |
| ADF | Association Dentaire Française | In French | → Associations → Dentistry |
| ADHET | Association pour le Développement de l’Hématologie et de la Transfusion | In French | → Associations → Blood and circulatory system |
| ADHS | Alcohol and Drugs History Society | In English | → History |
| ADI | Association des Doctorants de l'INRETS | In French | → Associations → Higher education, universities → Vehicle engineering → Transport and postal services |
| ADIAF | Association Départementale Interfédérale pour l'Aide Familiale | In French | → Associations → Social welfare |
| ADIASC | Association pour le Développement d'un Internet Associatif Solidaire et Citoyen | In French | → Associations → Internet → Telecommunications |
| ADIE | Association pour le Droit à l'Initiative Économique | In French | → Associations → Economics |
| ADIJ | Association pour le Développement de l'Informatique Juridique | In French | → Computer science → Law, jurisprudence |
| ADIL | Association pour le Développement de L'Informatique Libre | In French | → Associations → Software |
| ADIL | Association Départementale d'Information sur le Logement | In French | → Associations → Accommodation |
| ADIMAC | Association pour le Développement Industriel et économique du Massif central et du Centre | In French | → Associations → Economics |
| ADIPH | Association pour le Développement de l'Internet en Pharmacie Hospitalière | In French | → Associations → Networks, communication → Pharmacology, toxicology |
| ADIRS | Association pour le Développement de l'Information et de la Recherche sur la Sexualité | In French | → Associations → Sexual problems → Gynaecology |
| ADITEC | Association pour le Développement de l’Innovation et de la Technologie dans le Pas-de-Calais | In French | → Associations → Engineering, technology |
| ADIV | Association pour le Développement de l’Institut de la Viande | In French | → Associations → Agricultural sciences → Food technology |
| ADL | Advanced Development Laboratory | In English | → Research institutes |
| ADL | Avionics Development Laboratory | In English | → Research institutes → Spaceflight engineering, astronautics |
| ADLNB | Association of Designated Laboratories and Notified Bodies | In English | → Associations → Research institutes |
| ADM | Aanpakken Doet Meetellen | In Dutch | → Sport, physical exercises |
| ADME | Association of Destination Management Executives | In English | → Associations → Management |
| ADME | Americans for Democracy in the Middle East | In English | → Democracy |
| ADMICAL | Association pour le Développement du Mécénat Industriel et Commercial | In French | → Arts |
| ADN | AGF Detailhandel Nederland | In Dutch | → Trade |
| ADNFE | Association de Défense de la Noblesse Française et Étrangère | In French | → Associations |
| ADNX | Association pour la Documentation Numérique en XML | In French | → Programming languages → Libraries → Associations |
| ADO | Alles Door Oefening | In Dutch | → Sport, physical exercises |
| ADOSOM | Association pour le Développement des Oeuvres Sociales d'Outre-Mer | In French | → Associations → Social welfare |
| ADOT | (Fédération des) Associations pour le Don d'Organes et de Tissus humains | In French | → Associations → Medicine |
| ADP | Association pour le Développement de la Philatélie | In French | → Associations → Transport and postal services |
| ADP | Amici dei Popoli | In Italian | |
| ADP | Arbeitsgemeinschaft deutschsprachiger Psychologenverbände | In German | → Associations → Psychology |
| ADPF | Association pour la Diffusion de la Pensée Française | In French | → Associations → International relations |
| ADPHSO | Association pour le Développement de la Pharmacie Hospitalière du Sud-Ouest | In French | → Associations → Pharmacology, toxicology |
| AdR | Ausschuß der Regionen der Europäischen Union | In German | → Regional administration |
| ADRA | Adventist Development and Relief Agency | In English | → Christianity → Development |
| ADRAO | Association pour le Développement de la Riziculture en Afrique de l'Ouest |
In French | → Associations → Agricultural sciences |
| ADRPCC | Association pour le Développement des Recherches et applications de Physique Corpusculaire et Cosmique | In French | → Astronomy → Physics |
| ADS | Alles Door Samenspel | In Dutch | → Sport, physical exercises |
| ADSA | American Dairy Science Association | In English | → Associations → Agricultural sciences → Food technology |
| ADSEA | Association Départementale pour la Sauvegarde de l’Enfant à l’Adulte | In French | → Associations → Social welfare |
| ADSEA | Association Départementale de Sauvegarde de l'Enfance et de l'Adolescence | In French | → Associations → Social welfare |
| ADSL | Association des Surfeurs Lésés | In French | → Internet → Associations |
| ADSL-G | Association des surfeurs lésés de Guyane | In French | → Associations → Networks, communication → Telecommunications |
| ADSP | Association pour le Développement des Services de Proximité | In French | → Associations |
| ADSSS | Assoziazione dei Docenti delle Scuole Secondarie Superiori ticinesi | In Italian | → Education |
| ADT | Arbeitsgemeinschaft Deutscher Technologie- und Gründerzentren | In German | → Associations → Engineering, technology |
| ADT | Agence de Développement de la Touraine | In French | → Regional planning |
| ADV | Allgäuer Dartverband | In German | → Sport, physical exercises |
| ADV | Arbeitsgemeinschaft für Datenverarbeitung | In German | → Associations → 00462 |
| ADVENDO | Aangenaam Door Vermaak En Nuttig Door Ontspanning | In Dutch | → Sport, physical exercises |
| ADVEO | Aangenaam Door Vriendschap En Oefening | In Dutch | → Sport, physical exercises |
| ADW | Alles Door Wilskrachtzo | In Dutch | → Sport, physical exercises |
| AEA | Australian Esperanto Association (www.esperanto.org.au) = AEA | Aŭstralia Esperanto-Asocio | In Esperanto |
In English | → Associations |
| AEA | Aŭstralia Esperanto-Asocio = (look above) |
In Esperanto | → Associations |
| AEA | Association of European Airlines | In English | → Associations → Transport and postal services |
| AEAEE | Asociación de Empresas para el Ahorro de la Energía en la Edificación | In Spanish | → Associations → Energy economics |
| AEAP | Association d'Enseignement Agricole de Purpan | In French | → Associations → Specialized or (poly)technical colleges → Agricultural sciences |
| AEB | American Egg Board | In English | → Food technology |
| AEC | Association Européenne des Cheminots | In French | → Associations → Transport and postal services |
| AEC | Association d’Expertise des Concessions | In French | → Associations |
| AECC | Asociación Española de Centros Comerciales | In Spanish | → Associations → Trade |
| AECI | Agencia Española de Cooperación Internacional | In Spanish | → International relations |
| AECMA | Association Européenne des Constructeurs de Matériel Aérospatial | In French | → Associations → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| AECO | Asociación Española de Consultoras de Outplacement | In Spanish | → Associations → Economics → Consulting |
| AEDD | Asociación Española de Derecho Deportivo | In Spanish | → Associations |
| AEE | Arbeitsgemeinschaft Erneuerbare Energie | In German | → Associations → Energy economics |
| AEE | Association of Energy Engineers | In English | → Energy economics |
| AEEN | Agencia Europea para la Energía Nuclear = ENEA | European Nuclear Energy Agency | In English |
In Spanish | → Nuclear technology |
| ÅEF | Århus Esperanto-forening | In Danish | |
| AEF | Aŭstria Esperantista Federacio (http://aef.esperanto.at) | In Esperanto | |
| AEH | Asocio de Esperantistaj Handikapuloj | In Esperanto | → Associations |
| AEJ | Aŭstria Esperanto-Junularo (http://aej.esperanto.at) | In Esperanto | |
| AEJCI | Association des Étudiants Juristes de Côte d'Ivoire | In French | → Associations → Law, jurisprudence |
| AEJIC | Association des Étudiants Juristes de Côte d'Ivoire | In French | → Associations → Law, jurisprudence → Higher education, universities |
| AEJMC | Association for Education in Journalism and Mass Communication | In English | → Associations → Newspapers, journalism → Education |
| AEK | Asocio por Eŭropa Konscio | In Esperanto | → Associations → Politics |
| AELC | Asociación Europea de Libre Comercio (www.efta.int) = EFTA | European Free Trade Association | In English = ESVO | Evropské sdružení volného obchodu | In Czech = AELE | Association Européenne de Libre-Échange | In French = JFA | Jeropeeske Frijhannelsassosjaasje | In Frisian = EMAE | Europako Merkataritza Askearen Elkartea | In Basque = AELE | Associacion eropèèna de libro-èchanjo | In Franco-Provençal = ELKA | Eŭropa Liber-Komerca Asocio | In Esperanto = EFTA | 欧洲自由贸易联盟 | In Chinese = EVA | Europese Vrijhandelsassociatie | In Dutch = AELE | Associacion Europèa de Liure Escambi | In Occitan = ЕСТА | Европска Слободна Трговска Асоцијација | In Macedonian = AELS | Asociaţia Europeană a Liberului Schimb | In Romanian = ЄАВТ | Європейська асоціація вільної торгівлі | In Ukrainian = ЕФТА | Европска слободна трговинска асоцијација | In Serbian = EZVO | Európske združenie voľného obchodu | In Slovak = ЕАСТ | Европейская ассоциация свободной торговли | In Russian |
In Spanish | → Associations → Trade |
| AELE | Associacion eropèèna de libro-èchanjo (www.efta.int) = AELC, EFTA, ESVO, JFA, EMAE, ELKA, EVA, ЕСТА, AELS, ЄАВТ, ЕФТА, EZVO, ЕАСТ (look above) |
In Franco-Provençal | → Associations → Trade |
| AELE | Association Européenne de Libre-Échange (www.efta.int) = AELC, EFTA, ESVO, JFA, EMAE, ELKA, EVA, ЕСТА, AELS, ЄАВТ, ЕФТА, EZVO, ЕАСТ (look above) |
In French | → Associations → Trade |
| AELE | Associacion Europèa de Liure Escambi (www.efta.int) = AELC, EFTA, ESVO, JFA, EMAE, ELKA, EVA, ЕСТА, AELS, ЄАВТ, ЕФТА, EZVO, ЕАСТ (look above) |
In Occitan | → Associations → Trade |
| AELS | Asociaţia Europeană a Liberului Schimb (www.efta.int) = AELC, EFTA, ESVO, AELE, JFA, EMAE, ELKA, EVA, ЕСТА, ЄАВТ, ЕФТА, EZVO, ЕАСТ (look above) |
In Romanian | → Associations → Trade |
| AEM | Akademie für Ethik in der Medizin | In German | → Academies → Ethics → Medicine |
| AEN | Agencia para la Energía Nuclear = NEA | Nuclear Energy Agency | In English |
In Spanish | → Nuclear technology |
| AEN | Agence pour l’Énergie Nucléaire | In French | → Nuclear technology |
| AENOR | Asociación Española de Normalización y Certificación | In Spanish | → Associations → Standardization → Quality management |
| AEOM | Association des Étudiants d’Origine Malgache | In French | → Associations → Higher education, universities |
| AEP | Association of European Psychiatrists | In English | → Associations → Psychiatry |
| AEPA | Association pour l'Étude des Problèmes Avancés | In French | → Associations |
| AER | Association Européenne de Rugby | In French | → Associations → Football and rugby |
| AER | Assembly of European Regions | In English | → International relations |
| AERA | Amikaro de Esperanto en Radio | In Esperanto | → Telecommunications |
| AERDHA | Association d'Entraide pour la Réhabilitation de l'Habitat et le développement de l'assainissement | In French | → Accommodation → Environmental technology, water supply, waste management |
| AERFAI | Asociación Española de Reconocimientos de Formas y Análisis de Imágenes (www.aerfai.org) | In Spanish | → Associations → Graphical processing → Image processing |
| AERI | Association Expositions de Résistance Intérieure | In French | → Associations → History |