| AIDA | Associazione Italiana per la Documentazione Avanzata (www.aidaweb.it) | In Italian | → Libraries |
| AIDAA | Association Internationale des Auteurs de l'Audiovisuel | In French | → Cinema, movies |
| AIDAC | Associazione Dialoghisti Adattatori Cine-televisivi (www.aidac.it) | In Italian | → Telecommunications → Cinema, movies |
| AIDAMA | Associazione Italiana Autori Multivisione Artistica (www.aidama.it) | In Italian | |
| AIDOS | Associazione Italiana Donne per lo Sviluppo | In Italian | → Development |
| AIE | Asociación Iberoamericana de Ergonomía | In Spanish | → Human-computer interaction |
| AIE | European Association of Electrical Contractors | In English | → Electrical engineering |
| AIEL | Associazione Italiana Energia dal Legno | In Italian | → Nature → Energy economics → Agricultural sciences |
| AIEP | Association Internationale des Études Patristiques = IAPS | International Association of Patristics Studies | In English |
In French | → Archeology → Roman catholic church |
| AIEP | Association Internationale d'Ethnopsychanalyse | In French | → Ethnology → Psychology |
| AIEP | Asociación Internacional de Escritores Policiácos = IACW | International Association of Crime Writers | In English |
In Spanish | → Literature → Criminology |
| AIF | Association des Industries Ferroviaires | In French | → Rail transport engineering |
| AiF | Arbeitsgemeinschaft industrieller Forschungsvereinigungen | In German | → Research policy |
| AIF | Association des Industriels de France | In French | → Industry, industrial policy |
| AIF | Asociación Internacional de Fomento (www.worldbank.org/ida/) = IDA | International Development Association | In English = AID | Association Internationale de Développement | In French = AID | Associação Internacional de Desenvolvimento | In Portuguese = МАР | Международная ассоциация развития | In Russian = MAP | Міжнародна асоціація розвитку | In Serbian |
In Spanish | → Development |
| AIF | Associazione Festival Italiani (www.italiafestival.it) | In Italian | |
| AIFM | Associazione Italiana Fonici di Mix | In Italian | |
| AIFO | Associazione Italiana Amici di Raoul Follereau | In Italian | |
| AIGA | Associazione Italiana di Geologia Applicata ed Ambientale | In Italian | → Earth sciences |
| AIGeo | Associazione Italiana di Geografia fisica e Geomorfologia | In Italian | → Earth sciences → Geography |
| AIHA | American Italian Historical Association | In English | → History |
| AIHUS | Association Inter-Hospitalo-Universitaire de Sexologie | In French | → Sexual problems → Gynaecology |
| AIIM | Asociaţia Internaţională a Inspecţiei Muncii | In Romanian | |
| AIL | Association Isépienne du Libre | In French | → Software |
| AILF | Association des Informaticiens de Langue Française | In French | → Computer science |
| AILS | Associazione Italiana Lotta alla Sclerodermia | In Italian | → Dermatology |
| AILS | Association Informatique Libre et Santé | In French | → Software → Medicine |
| AIMH | Association for Infant Mental Health | In English | → Psychiatry |
| AinB | Associatie van Interieurarchitecten van België (www.ainb.be) | In Dutch | → Architecture |
| AIPCR | Association Internationale Permanente des Congrès de la Route | In French | → Congresses → Transport and postal services |
| AIPO | Asociación Interacción Persona-Ordenador | In Spanish | → Human-computer interaction |
| AIPSC | Associazione Italiana Professionisti Spettacolo e Cultura (www.aipsc.net) | In Italian | |
| AIQUA | Associazione Italiana per lo studio del Quaternario | In Italian | → Earth sciences |
| AIR | Asociaţia pentru Instrumentaţie din România | In Romanian | → Mechanical engineering |
| AIR | Associazione Italiana Rugbysti | In Italian | → Football and rugby |
| AIS | Association Internationale de la Sémiotique = IASS | International Association for Semiotic Studies | In English |
In French | → Semiotics |
| AISPO | Associazione Italiana per la Solidarietà tra i Popoli | In Italian | |
| AISV | Association Internationale de Sémiotique Visuelle | In French | → Semiotics |
| AIT | Association des Internautes Territoriaux | In French | → Internet |
| AITC | Associazione Italiana Telecineoperatori (www.aitc.it) | In Italian | → Cinema, movies |
| AITR | Associazione Italiana Tecnici di Ripresa (www.aitr.info) | In Italian | |
| AITS | Associazione Italiana Tecnici del Suono (www.aits.it) | In Italian | |
| AJDSI | Association des Journalistes de Défense et de Sûreté Intérieure | In French | → Newspapers, journalism |
| AJHA | American Journalism Historians' Association | In English | → Newspapers, journalism → History |
| AJP | Association des Journalistes Parlementaires | In French | → Newspapers, journalism → Parliaments, representation |
| AKMOS | Associatie van Kleine en Middelgrote Ondernemingen in Suriname | In Dutch | → Economics |
| ALA | American Library Association | In English | → Libraries |
| ALA | American Library Association | In French | → Libraries |
| ALAI | Association Littéraire et Artistique Internationale (http://alai.org) | In French | → Arts → Literature |
| ALAS | Asociación Latinoamericana de Sociología | In Spanish | → Sociology |
| ALCO | Associação Brasileira da Indústria de Álcool | In Portuguese | → Beverage industry |
| ALD | Association of Lighting Designers | In English | |
| ALEBA | Association Luxembourgeoise des Employés de Banque et d'Assurances | In French | → Labour, labour economics → Insurance → Finance |
| ALFEDIAM | Association de Langue Française pour l'Étude du Diabète et des Maladies Métaboliques (www.alfediam.org) | In French | → Physiology → Pathology |
| ALI | Associazione Locali di Intrattenimento | In Italian | |
| ALI | Associazione Librai Italiani | In Italian | |
| ALIS | Association Linux et Informatique Souss | In French | → Operating systems |
| ALK | Association Languedocienne de Kyudo | In French | → Entertainment |
| ALK | Association Luxembourgeoise des Kinésithérapeutes (www.alk.lu) | In French | → Medicine |
| ALL | Association pour le Logiciel Libre | In French | → Software |
| ALLA | Australian Law Librarians' Association | In English | → Libraries → Law, jurisprudence |
| ALM | Associazione Laicale Missionaria | In Italian | |
| ALO | Association Luxembourgeoise des Orthophonistes (www.alo.lu) | In French | → Surgery, orthopaedics, ophthalmology |
| ALO | Association Luxembourgeoise des Olympiens (www.olympiens.lu) | In French | → Sport, physical exercises |
| ALOLISE | Association pour la promotion des LOgiciels LIbres de Saint-Étienne | In French | → Software |
| ALPO | Association of Lunar & Planetary Observers | In English | → Planets and satellites |
| ALSA | Amyotrophic Lateral Sclerosis Association (www.alsa.org) | In English | → Pathology |
| ALTA | African Languages Teachers Association | In English | → Education → Language, linguistics, literature |
| ALTE | Association of Language Testers in Europe | In English | → Language, linguistics, literature |
| ALTEN | Association pour la Lutte Contre le Travail des Enfants au Niger | In French | → Labour, labour economics → Slavery |
| AMA | Associazione Mani Amiche | In Italian | |
| AMA | American Motorcyclist Association | In English | → Transport and postal services |
| AMA | Associação dos Mediadores Imobiliários | In Portuguese | → Accommodation |
| AMA | American Medical Association | In English | → Medicine |
| AMANJ | Association of Municipal Assessors of New Jersey (www.amanj.org) | In English | → 332 |
| AMAP | Association du Maintien de l'Agriculture Paysanne | In French | → Agricultural sciences |
| AMB | Associação Médica Brasileira | In Portuguese | → Medicine |
| AMB | Associação dos Magistrados Brasileiros | In Portuguese | → Law, jurisprudence |
| AMC | Associazione Montaggio Cinematografico e Televisivo | In Italian | → Telecommunications → Cinema, movies |
| AMDEA | Association of Manufacturers of Domestic Electrical Appliances | In English | → Electrical engineering |
| AMDHS | Association des Médecins Dirigeants d'Hôpitaux de Suisse = VLSS | Verein der leitenden Spitalärzte der Schweiz | In German |
In French | → Medicine |
| AME | Asociación Manchega de Esperanto (www.ame-emas.tk) = EMAS | Esperantista Manĉa Asocio | In Esperanto |
In Spanish | |
| AMET | Asociación Mexicana de Esclerosis Tuberosa | In Spanish | → Neurology |
| AMF | Association Française contre les Myopathies | In French | → Pathology |
| AMG | Associazione Mondo Giusto | In Italian | |
| AMGVF | Association des Maires des Grandes Villes de France | In French | → Municipal administration |
| AMIC | Arbeitsgemeinschaft für Minimal Invasive Chirurgie | In German | → Surgery, orthopaedics, ophthalmology |
| AMJ | Association du Multimédia Jeunesse (www.amj.asso.fr) | In French | → Software |
| AMN | Asociación MERCOSUR para la Normalización | In Spanish | → Standardization |
| AMPQ | Association des Médecins Psychiatres du Québec | In French | → Psychiatry |
| AMR | Association of Muslim Researchers | In English | → Islam |
| AMSA | Austrian Medical Students Association (www.amsa.at) | In English | → Higher education, universities → Medicine |
| AMSPPR | Asociaţia Medicilor Stomatologi cu Practică Privată din România | In Romanian | → Medicine |
| AMSR | Asociaţia pentru Medicina Sexualităţii din România | In Romanian | → Sexual problems → Urology |
| AmZI | Arbeitsgemeinschaft für das messianische Zeugnis an Israel | In German | → Religion, theology |
| ANA | Alaska Nurses Association | In English | → Medicine |
| ANAC | Associazione Nazionale Autori Cinematografici (www.anac-autori.it) | In Italian | → Cinema, movies |
| ANAD | Associazione Nazionale Attori Doppiatori (www.doppiatori.org) | In Italian | |
| ANAS | Association Nationale des Assistants Sociaux | In French | → Social aid |
| ANCCI | Associazione Nazionale Circoli Cinematografici Italiani (www.ancci.it) | In Italian | → Cinema, movies |
| ANCD | Associazione Nazionale Cooperative Dettaglianti | In Italian | → Trade |
| ANCGG | Association Nationale des Chasseurs de Grand Gibier | In French | → Fishing, hunting |
| ANDA | Associação Nacional para Difusão de Adubos | In Portuguese | |
| ANDCP | Association Nationale des Directeurs et Cadres de la fonction Personnel | In French | → 0055 → Personnel management |
| ANEB | Association Nationale pour l'Espéranto au Burundi | In French | |
| ANEC | Associazione Nazionale Esercenti Cinema | In Italian | → Cinema, movies |
| ANEEFEL | Association Nationale des Expéditeurs et Exportateurs de Fruits & Légumes | In French | → Physics |
| ANEM | Association Nationale des Élus de Montagne | In French | → Politics |
| ANEM | Associazione Nazionale Esercenti Multiplex | In Italian | → Cinema, movies |
| ANEVAR | Asociaţia Naţională a Evaluatorilor din România | In Romanian | |
| ANF | Associação Nacional das Farmácias | In Portuguese | → Pharmacology, toxicology |
| ANFA | Association Nationale pour la Formation Automobile | In French | → Education → Automobile manufacturing |
| ANFAVEA | Associação Nacional dos Fabricantes de Veículos Automotores | In Portuguese | → Vehicle engineering |
| ANIA | Associazione Nazionale fra le Imprese Assicuratrici | In Italian | |
| ANICA | Associazione Nazionale Industrie Cinematografiche e Affini | In Italian | → Cinema, movies |
| ANICER | Associação Nacional da Indústria Cerâmica | In Portuguese | → Building |
| ANIE | Associazione Nazionale Industrie Elettrotecniche ed Elettroniche | In Italian | → Electrical engineering → Electronics |
| ANIH | Asociación Nacional de Investigadores Hospitalarios | In Spanish | → Medicine |
| ANIS | Asociaţia Naţională a Industriei de Software şi Servicii din România | In Romanian | → Software → Telecommunications |
| ANIS | Association Nord Internet Solidaire | In French | → Internet → Telecommunications |
| ANJE | Associação Nacional dos Jovens Empresários | In Portuguese | |
| ANJI | Association Nationale des Juges d'Instance (www.anji.fr) | In French | → Law, jurisprudence |
| ANL | Associazione Noi per Loro | In Italian | |
| ANLLF | Association des Neurologues Libéraux de Langue Française | In French | → Neurology |
| ANME | Asociación Nacional de Mujeres Españolas | In Spanish | → Feminism |
| ANMP | Associação Nacional de Municípios Portugueses | In Portuguese | → Municipal administration |
| ANNSPQ | Association des Naturopathes et Naturothérapeutes Spécialisés en Phytothérapie du Québec | In French | → Pharmacology, toxicology |
| ANOCEF | Association des Neuro-OnCologues d'Expression Française | In French | → Neurology → Oncology |
| ANP | Association of Newfoundland Psychologists | In English | → Psychology |
| ANPE | Associazione Nazionale Poliuretano Espanso | In Italian | → Chemical technology → Plastic industry |
| ANPER | Association Nationale de Promotion de l'Éducation Routière | In French | → Education → Transport and postal services |
| ANPS | Association Nationale des Podologues du Sport | In English | → Medicine → Sport, physical exercises |
| ANRT | Association Nationale de la Recherche Technique | In French | → Research policy → Engineering, technology |
| ANS | Associazione Nazionale Sociologi | In Italian | → Sociology |
| ANVI | Associazione Nazionale Videoteche Italiane | In Italian | → Libraries → Cinema, movies |
| AOMSL | Association Ornithologique et Mammalogique de Saône-et-Loire | In French | → Mammals |
| APA | American Psychological Association | In English | → Psychology |
| APA | American Psychiatric Association (www.psych.org) | In English | → Psychiatry |
| APA | Association Professionnelle des Armaturiers | In French | → Building |
| APAHS | Association for the Publication of African Historical Sources | In English | → Graphic industries, printing, publishing → History |
| APAST | Association Africaine Pour l'Avancement des Sciences et Techniques = AAAST | African Association for the Advancement of Science and Technology | In English |
In French | → Mathematics and natural sciences → Applied sciences, technology |
| APAVE | Association des Propriétaires d’Appareils à Vapeur et Électriques | In French | → Electrical engineering |
| APBC | Association of Pet Behaviour Counsellors (www.apbc.org.uk) | In English | |
| APC | Association de Producteurs de Cinéma (www.producteurscinema.fr) | In French | → Cinema, movies |
| APCC | Associação Portuguesa de Centros Comerciais | In Portuguese | → Trade |
| APCC | Association pour la Promotion de la Course Croisière | In French | → Sport, physical exercises |
| APCC | Association of Professional Computer Consultants | In English | → Computer science → Consulting |
| APCC | Association of Professional Communication Consultants | In English | → Consulting |
| APCC | Association for the Preservation of Cape Cod | In English | → Nature |
| APCG | Association des Présidents des Conseils Généraux | In French | → Public administration, government |
| APCG | Association des Présidents de Conseils généraux | In French | → Regional administration |
| APDIS | Associação Portuguesa de Documentação e Informação de Saúde | In Portuguese | → Libraries → Medicine |
| APE | Associazione Italiana Produttori Esecutivi (www.ape-italy.com) | In Italian | |
| APE | Associazione Pavese Esperanto | In Italian | |
| APE | Asociación Primatológica Española (www.uam.es/ape) | In Spanish | → Primates |
| APEC | Association Pour l'Emploi des Cadres | In French | → Labour, labour economics |
| APECITA | Association Pour l'Emploi des Cadres, Ingénieurs et Techniciens de l'Agriculture | In French | → Labour, labour economics → Agricultural sciences |
| APEI | Association de Parents d'Enfants Inadaptés | In French | |
| APES | Association de la Presse Etrangère au Sénégal | In French | → Newspapers, journalism |
| APESA | Association Pour l'Environnement et la Sécurité en Aquitaine (www.apesa.fr) | In French | → Environment, environmental sciences → Environmental technology, water supply, waste management |
| APESCA | Association des Pharmaciens des Établissements de Soins de la Côte d'Azur | In French | → Pharmacology, toxicology |
| APESOM | Association des Pharmaciens des Établissements de Santé de l'Outre-Mer | In French | → Pharmacology, toxicology |
| APF | Association de la Presse Francophone | In French | → Newspapers, journalism |
| APFAPE | Associação Portuguesa de Familiares, Amigos e Pessoas com Epilepsia | In Portuguese | → Neurology |
| APFPC | Association pour la Formation Professionnelle et Continue | In French | → Education |
| APGI | Association de Pharmacie Galénique Industrielle (www.apgi.org) | In French | → Pharmacology, toxicology |
| APHA | American Public Health Association (www.apha.org) | In English | → Public health and hygiene |
| APHA | American Printing History Association | In English | → Graphic industries, printing, publishing → History |
| APHAL | Association des Pharmaciens Hospitaliers d'Alsace et de Lorraine | In French | → Pharmacology, toxicology |
| APHBFC | Association des Pharmaciens Hospitaliers de Bourgogne & Franche-Comté | In French | → Pharmacology, toxicology |
| APHCA | Association de Pharmacie Hospitalière de Champagne-Ardenne | In French | → Pharmacology, toxicology |
| APHIF | Association de Pharmacie Hospitalière d'Île-de-France | In French | → Pharmacology, toxicology |
| APHM | Association Pharmacie Hospitalière et Médicaments | In French | → Pharmacology, toxicology |
| APHO | Association de la Pharmacie Hospitalière de l'Ouest | In French | → Pharmacology, toxicology |
| APHO | Association de Pharmacie Hospitalière de l'Ouest | In French | → Pharmacology, toxicology |
| APHOSA | Association de Pharmacie Hospitalière de l'Oise Somme Aisne | In French | → Pharmacology, toxicology |
| API | Association des Producteurs Indépendants | In French | → Cinema, movies |
| API-PL | Association pour la Promotion d'Internet pour les Professions Libérales | In French | → Networks, communication → Telecommunications |
| APIC | Asociaţia pentru Tehnologia Informaţiei şi Comunicaţii din România | In Romanian | → Computer science → Telecommunications |
| APIL | Association des Professionnels des Industries de la Langue (www.apil.asso.fr) | In French | → Linguistics |
| APINC | Association Pour la Promotion et la défense de l'Internet Non Commercial | In French | → Internet |
| APIQ | Associazione dei Professori d’Italiano del Quebec (http://apiq.enry.net) | In Italian | → Education → Language, linguistics, literature |
| APIQ | Association des Professeurs d’Italien du Québec (http://apiq.enry.net) | In French | → Education → Language, linguistics, literature |
| APL | Association des Professions Libérales | In French | |
| APL2C | Association for Persian Language, Linguistics and Computing | In English | → Computer-based techniques → Linguistics |
| APM | Associação Paulista de Medicina | In Portuguese | → Medicine |
| APNS | Association of Psychologists of Nova Scotia | In English | → Psychology |
| APOEL | Association pour la Préfiguration de l'Observatoire de l'Économie du Livre | In French | → Graphic industries, printing, publishing |
| APOM | Association des Producteurs d'Oeuvres Multimédia (www.apom.org) | In French | → Software → Arts |
| APPMA | American Pet Products Manufacturers Association (www.appma.org) | In English | |
| APPMA | Association de Pêche et de Protection des Milieux Aquatiques | In French | → Nature → Fishing, hunting |
| APPPH | Association for Pre- & Perinatal Psychology and Health | In English | → Psychology → Pediatry |
| APRHOC | Association des pharmaciens PRaticiens des HÔpitaux du Centre | In French | → Pharmacology, toxicology |
| APRLR | Asociaţia Practicienilor în Reorganizare şi Lichidare | In Romanian | |
| APRLR | Asociaţia Practicienilor în Reorganizare şi Lichidare din România | In Romanian | → Law, jurisprudence |
| APRONET | Association des Professionnels Internet et Webmestres Territoriaux | In French | → Internet |
| APRP | Association of Professional Rodeo Photographers | In English | → Photography |
| APRP | Associação Portuguesa de Reconhecimento de Padrões | In Portuguese | → Computer-based techniques |
| APS | Associazione per la Partecipazione allo Sviluppo | In Italian | → Development |
| APS | American Physiological Society (www.the-aps.org) | In English | → Physiology |
|