| AIST | Agency of Industrial Science and Technology | In English | → Research policy → Engineering, technology |
| AIU | Avionics Interface Unit | In English | → Human-computer interaction → Aeronautics, aircraft |
| AIVC | Air Infiltration and Ventilation Centre | In English | → Environmental technology, water supply, waste management → Building |
| AIXM | Aeronautical Information eXchange Model | In English | → Software → Aeronautics, aircraft |
| AIZ | Agrarisches Informationszentrum | In German | → Agricultural sciences |
| AJD | Aide aux Jeunes Diabétiques | In French | → Physiology → Pathology |
| AJSE | Arabian Journal of Science Engineering | In English | → Serial publications, periodicals → Mathematics and natural sciences |
| AKB | Angka Kematian Bayi = ММВБ | Московская межбанковская валютная биржа | In Russian = MICEX | Moscow Interbank Currency Exchange | In English = МБВБ | Мускав банксен валютă биржи | In Chuvash = IMR | Infant Mortality Rate | In English = TMI | Taxa de Mortalidade Infantil | In Portuguese = TMI | Taux de Mortalité Infantile | In French = TMI | Taxa de Mortalitat Infantil | In Catalan |
In Indonesian | → Statistics → Pediatry |
| AKPE | Allgemeines Krankenhaus-Planungs- und Errichtungsgesellschaft | In German | → Organizations and associations → Medicine → Building |
| AKS | Arbeitskreis Schuldruckerei | In German | → Organizations and associations → Education → Graphic industries, printing, publishing |
| AKW | Atomkraftwerk | In German | → Nuclear technology |
| AL | Approach and Landing | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALARA | As Low As Reasonably Achievable | In English | → Nuclear technology |
| ALAS | Approach/Landing Autopilot Subsystem | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALASAT | Air-Launched Antisatellite | In English | → Military engineering → Spaceflight engineering, astronautics |
| ALAT | Aviation Légère de l'Armée de Terre | In French | → Public administration, government → Military engineering → 63973 |
| ALC | Air Logistics Center | In English | → Maintenance and logistics → Transport and postal services |
| ALCM | Air-Launched Cruise Missile | In English | → Military engineering → Aeronautics, aircraft |
| ALCO | Associação Brasileira da Indústria de Álcool | In Portuguese | → Associations → Beverage industry |
| ALCOA | Aluminum Corporation Of America | In English | → Metallurgy |
| ALCOM | Aquaculture for Local Community Development Programme | In English | → Agricultural sciences |
| ALD | Adrenoleukodystrophie | In German | → Pathology |
| ALDP | Advanced Launch Development Program | In English | → Spaceflight engineering, astronautics |
| ALECOB | Agence Locale de l'Énergie du Centre-Ouest Bretagne | In French | → Energy economics |
| ALFEDIAM | Association de Langue Française pour l'Étude du Diabète et des Maladies Métaboliques (www.alfediam.org) | In French | → Associations → Physiology → Pathology |
| AlFr | Alta Frequenza | In Italian | → Serial publications, periodicals → Electronics |
| ALK | Association Luxembourgeoise des Kinésithérapeutes (www.alk.lu) | In French | → Associations → Medicine |
| ALMR | Advanced Liquid Metal Reactor | In English | → Nuclear technology |
| AlN | Aluminum Nitride | In English | → 665 |
| ALO | Association Luxembourgeoise des Orthophonistes (www.alo.lu) | In French | → Associations → Surgery, orthopaedics, ophthalmology |
| ALP | Access Linux Platform | In English | → Networks, communication → Telecommunications |
| ALPhA | Aquitaine Lasers Photonique et Applications | In French | → Engineering, technology |
| ALRF | Anesthésie locorégionale francophone | In French | → Anesthesiology |
| ALS | Alternative Landing Site | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALS | Approach/Landing System | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALS | Advanced Launch System | In English | → Spaceflight engineering, astronautics |
| ALS | Automatic Landing System | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALS | Amyotrophe Lateralsklerose = ALS | Amyotrophic Lateral Sclerosis | In English |
In German | → Pathology |
| ALS | Advanced Life Support | In English | → Medicine |
| ALS | Amyotrophic Lateral Sclerosis = (look above) |
In English | → Pathology |
| ALSA | Amyotrophic Lateral Sclerosis Association (www.alsa.org) | In English | → Associations → Pathology |
| ALSA | Astronaut Life Support Assembly | In English | → Spaceflight engineering, astronautics |
| ALSE | Astronaut Life Support Equipment | In English | → Spaceflight engineering, astronautics |
| ALT | Approach and Landing Test | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALTR | Approach and Landing Test Requirement | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| ALTS | Avionics LRU Tracking System | In English | → Aeronautics, aircraft |
| ALV | Advanced Launch Vehicle | In English | → Vehicle engineering |
| ALV | Advanced Logistics Vehicle | In English | → Maintenance and logistics → Vehicle engineering |
| ALWR | Advanced Light Water Reactor | In English | → Nuclear technology |
| AM | Aeromedical Monitor | In English | → Medicine → Aeronautics, aircraft |
| AM&S | Australian Mining and Smelting Ltd. | In English | → Mining → Metallurgy |
| AMA | Agenzia Milanese Mobilita' e Ambiente | In Italian | → Nature → Vehicle engineering → Transport and postal services |
| AMA | American Motorcyclist Association | In English | → Associations → Transport and postal services |
| AMA | American Medical Association | In English | → Associations → Medicine |
| AMADEIA | Association Marocaine pour le Développement de l'Électronique, de l'Électrotechnique, de l'Informatique et de l'Automatique | In French | → Organizations and associations → Electrical engineering → Electronics → Computer science |
| AMAL | Aviation Medical Acceleration Laboratory | In English | → Research institutes → Medicine → Transport and postal services |
| AMAL | Aeronautical Medical Acceleration Laboratory | In English | → Research institutes → Medicine → Aeronautics, aircraft |
| AMAP | Association du Maintien de l'Agriculture Paysanne | In French | → Associations → Agricultural sciences |
| AMAS | Austrian Moderate Altitude Study | In English | → Medicine |
| AMB | Associação Médica Brasileira | In Portuguese | → Associations → Medicine |
| AMC | American Motors Corporation | In French | → Vehicle engineering |
| AMC | Allocation de Mise en Construction | In French | → Accommodation → Building |
| AMC | Army Missile Command | In English | → Military engineering |
| AMC | Associazione Montaggio Cinematografico e Televisivo | In Italian | → Associations → Telecommunications → Cinema, movies |
| AMCA | Aft Motor Controller Assembly | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| AMCOW | African Ministers' Council on Water | In English | → Organizations and associations → Hydrology → Environmental technology, water supply, waste management |
| AMCOW | African Ministerial Conference on Water | In English | → Organizations and associations → Hydrology → Environmental technology, water supply, waste management |
| AMCSIT | Agenţia Managerială de Cercetare Ştiinţifică, Inovare şi Transfer Tehnologic | In Romanian | → Research policy → Engineering, technology |
| AMD | Altersbedingte Makuladegeneration | In German | → Ophtalmology |
| AMDB | Airport Mapping Databases | In English | → Transport and postal services |
| AMDEA | Association of Manufacturers of Domestic Electrical Appliances | In English | → Associations → Electrical engineering |
| AMDF | American Macular Degeneration Foundation (www.macular.org) | In English | → Foundations → Ophtalmology |
| AMDHS | Association des Médecins Dirigeants d'Hôpitaux de Suisse = VLSS | Verein der leitenden Spitalärzte der Schweiz | In German |
In French | → Associations → Medicine |
| AMEC | Aft Master Events Controller | In English | → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| AMEDEUS | Accelerate Membrane Development for Urban Sewage Purification | In English | → Environmental technology, water supply, waste management |
| AMEL | Agencia Municipal de Energia de Loures | In Portuguese | → Energy economics |
| AMeLi | Assurance Maladie en Ligne | In French | → Networks, communication → Insurance → Medicine |
| AMET | Asociación Mexicana de Esclerosis Tuberosa | In Spanish | → Associations → Neurology |
| AMEU | Alpha/Mach Indicator Electronic Unit | In English | → Electronics |
| AMEXA | Assurance Maladie des Exploitants Agricoles | In French | → Insurance → Agricultural sciences |
| AMF | Abort Motor Facility | In English | → Vehicle engineering |
| AMF | Association Française contre les Myopathies | In French | → Associations → Pathology |
| AMFL | Aeromedical Field Laboratory | In English | → Research institutes → Medicine → Aeronautics, aircraft |
| AMI | Airspeed/Mach Indicator | In English | → Aeronautics, aircraft |
| AMI | Alpha/Mach Indicator | In English | → Aeronautics, aircraft |
| AMI | Agency for Medical Innovations | In English | → Pharmacology, toxicology |
| AMIC | Arbeitsgemeinschaft für Minimal Invasive Chirurgie | In German | → Associations → Surgery, orthopaedics, ophthalmology |
| AMIG | Agence Maintenance Inter-centre Gaz | In French | → Energy economics |
| AmJC | American Journal of Cardiology | In English | → Serial publications, periodicals → Cardiology |
| AMK | Aircraft Modification Kit | In English | → Aeronautics, aircraft |
| AMLS | Advanced Manned Launch System | In English | → Spaceflight engineering, astronautics |
| AMM | Autorisation de Mise sur le Marché | In French | → Pharmacology, toxicology |
| AMO | Assistance à la Maîtrise d'Ouvrage | In French | → Civil engineering → Building |
| AMO | Aerospace Medical Operations | In English | → Medicine → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| AMOOS | Advanced Maneuvering Orbit-to-Orbit Shuttle | In English | → Spaceflight engineering, astronautics |
| AMP | Advanced Materials and Processes | In English | → Serial publications, periodicals → 666 |
| AMP | Assistance Médicale à la Procréation | In French | → Obstetrics |
| AMPERE | Assistance pour la Maîtrise des Procédés par l’Emploi Rationnel des Énergies | In French | → Engineering, technology → Energy economics |
| AMPQ | Association des Médecins Psychiatres du Québec | In French | → Associations → Psychiatry |
| AMPR | Aeronautical Manufacturer's Progress Report | In English | → Aeronautics, aircraft |
| AMPR | Aeronautical Manufacturer's Planning Report | In English | → Aeronautics, aircraft |
| AMPS | Advances Mobile Phone Service | In English | → Telecommunications |
| AMR | Atlantic Missile Range | In English | → Military engineering |
| AMRC | Accès Multiple par Répartition en Code = CDMA | Code Division Multiple Access | In English |
In French | → Telecommunications |
| AMREF | African Medical and Research Foundation | In English | → Foundations → Medicine → Research policy |
| AMS | Autocommutateur Téléphonique Multiservices | In French | → Telecommunications |
| AMSA | Austrian Medical Students Association (www.amsa.at) | In English | → Associations → Higher education, universities → Medicine |
| AMSPPR | Asociaţia Medicilor Stomatologi cu Practică Privată din România | In Romanian | → Associations → Medicine |
| AMSR | Asociaţia pentru Medicina Sexualităţii din România | In Romanian | → Associations → Sexual problems → Urology |
| AMT | Assistance Marché de Travaux | In French | → Civil engineering → Building |
| AMU | Attitude Match Update | In English | → Spaceflight engineering, astronautics |
| AMU | Astronaut Maneuvering Unit | In English | → Spaceflight engineering, astronautics |
| ANA | Alaska Nurses Association | In English | → Associations → Medicine |
| ANADER | Agence Nationale pour le Développement Rural | In French | → Organizations and associations → Agricultural sciences → Regional planning |
| ANAES | Agence Nationale d'Accréditation et d'Évaluation en Santé | In French | → Medicine |
| ANARS | Autonomous Navigation and Attitude Reference System | In English | → Spaceflight engineering, astronautics |
| ANBO | African Network of Basin Organisations | In English | → 341224 → Hydrology → 626 → Engineering, technology |
| ANC | American Nuclear Corporation | In English | → Nuclear technology |
| ANCGG | Association Nationale des Chasseurs de Grand Gibier | In French | → Associations → Fishing, hunting |
| ANCGM | Agence Nationale de la Géologie et du Contrôle Minier | In French | → Central administration → Earth sciences → Mining |
| AND | Air Force-Navy (Aeronautical) Design | In English | → 358 → 359 → Aeronautics, aircraft |
| ANDA | Association Nationale pour le Développement de l'Agriculture | In French | → Organizations and associations → Agricultural sciences |
| ANDIH | Agence Nationale de l'Informatique Hospitalière | In French | → Computer science → Organizations and associations → Medicine |
| ANDRA | Agence Nationale pour la gestion des Déchets Radioactifs | In French | → Central administration → Nuclear technology |
| ANEMONE | Analyse Environnementale et MOdélisation Numérique de l’Éolien | In French | → Energy economics → Environmental technology, water supply, waste management |
| ANF | Associação Nacional das Farmácias | In Portuguese | → Associations → Pharmacology, toxicology |
| ANFA | Association Nationale pour la Formation Automobile | In French | → Associations → Education → Automobile manufacturing |
| ANFAVEA | Associação Nacional dos Fabricantes de Veículos Automotores | In Portuguese | → Associations → Vehicle engineering |
| ANFH | Association Nationale pour la Formation permanente du personnel Hospitalier | In French | → Organizations and associations → Education → Medicine |
| ANFPA | Association Nationale pour la Formation Professionnelle en Agriculture | In French | → Organizations and associations → Education → Agricultural sciences |
| ANFR | Agence Nationale des FRéquences | In French | → Telecommunications |
| ANGDM | Agence Nationale pour la Garantie des Droits des Mineurs | In French | → Labour, labour economics → Mining |
| ANGED | Agence Nationale de Gestion des Déchets | In French | → Environmental technology, water supply, waste management |
| ANGT | Austrian Network for Gene Therapy | In English | → Organizations and associations → Biotechnology |
| ANICER | Associação Nacional da Indústria Cerâmica | In Portuguese | → Associations → Building |
| ANIE | Associazione Nazionale Industrie Elettrotecniche ed Elettroniche | In Italian | → Associations → Electrical engineering → Electronics |
| ANIH | Asociación Nacional de Investigadores Hospitalarios | In Spanish | → Associations → Medicine |
| ANIS | Association Nord Internet Solidaire | In French | → Internet → Associations → Telecommunications |
| ANIS | Asociaţia Naţională a Industriei de Software şi Servicii din România | In Romanian | → Associations → Software → Telecommunications |
| ANLLF | Association des Neurologues Libéraux de Langue Française | In French | → Associations → Neurology |
| ANNSPQ | Association des Naturopathes et Naturothérapeutes Spécialisés en Phytothérapie du Québec | In French | → Associations → Pharmacology, toxicology |
| ANOCEF | Association des Neuro-OnCologues d'Expression Française | In French | → Associations → Neurology → Oncology |
| ANPE | Associazione Nazionale Poliuretano Espanso | In Italian | → Associations → Chemical technology → Plastic industry |
| ANPEEC | Agence Nationale pour la Participation des Employeurs à l'Effort de Construction | In French | → Labour, labour economics → Building |
| ANPER | Association Nationale de Promotion de l'Éducation Routière | In French | → Associations → Education → Transport and postal services |
| ANPS | Association Nationale des Podologues du Sport | In English | → Associations → Medicine → Sport, physical exercises |
| ANRE | Agenţia Naţională de Reglementare în Domeniul Energiei | In Romanian | → Central administration → Energy economics" |
| AnRE | Annual Review of Energy | In English | → Serial publications, periodicals → Energy economics |
| ANRED | Agence Nationale pour la Récupération et l'Élimination des Déchets | In French | → Environmental technology, water supply, waste management |
| AnREE | Annals of Research on Engineering Education | In English | → Serial publications, periodicals → Education → Engineering, technology |
| AnRMS | Annual Review of Materials Science | In English | → Serial publications, periodicals → 620 |
| ANRS | Agence Nationale de Recherches sur le SIDA | In French | → Infectious diseases |
| ANRT | Association Nationale de la Recherche Technique | In French | → Research policy → Associations → Engineering, technology |
| ANS | Advanced Neutron Source | In English | → Nuclear technology |
| ANSV | Autoritatea Naţională Sanitară-Veterinară şi pentru Siguranţa Alimentelor | In Romanian | → Central administration → Medicine → Veterinary medicine → Food technology |
| ANSVSA | Autoritatea Naţională Sanitar-Veterinară şi pentru Siguranţa Alimentelor (www.ansv.ro) | In Romanian | → Central administration → Veterinary medicine → Food technology |
| ANT | Advanced Navigation Trainer | In English | → Transport and postal services |
| ANTAV | Association Nationale Technique pour l'Amélioration de la Viticulture | In French | → Organizations and associations → Agricultural sciences |
| AnTel | Annales des Télécommunications | In French | → Serial publications, periodicals → Telecommunications |
| ANVAR | Agence Nationale de Valorisation de la Recherche | In French | → Research policy → Economics |
| ANVREDET | Agence Nationale de la Valorisation des Résultats de la Recherche et du Développement Technologique | In French | → Research policy → Engineering, technology |
| AOA | Administration on aging | In English | → Public administration, government → Gerontology |
| AOC | Appellation d'Origine Controlée | In French | → Agricultural sciences |
| AOCS | Attitude and Orbit Control Subsystem | In English | → Spaceflight engineering, astronautics |
| AOCS | Attitude and Orbit Control System | In English | → Spaceflight engineering, astronautics |
| AOD | Aircraft Operations Division | In English | → Aeronautics, aircraft |
| AOMI | Artérite Oblitérante des Membres Inférieurs | In French | → Cardiology |
| AOP | Appellation d’Origine Protégée | In French | → Agricultural sciences |
| AOSSM | American Orthopeadic Society of Sports Medicine | In English | → Organizations and associations → Surgery, orthopaedics, ophthalmology → Sport, physical exercises |
| AOSTE | Analyse et l'Optimisation des Systèmes Temps-Réel Embarqués | In French | → Computer science → Electronics |
| AOT | Avionics Operating Time | In English | → Aeronautics, aircraft |
| AOT | Avionics Overall Test | In English | → Aeronautics, aircraft |
| AP-HP | Assistance Publique - Hôpitaux de Paris | In French | → Medicine |
| APA | American Psychiatric Association (www.psych.org) | In English | → Associations → Psychiatry |
| APA | Association Professionnelle des Armaturiers | In French | → Associations → Building |
| APAF | Action Plasturgie Artois Flandres | In French | → Plastic industry |
| APAHS | Association for the Publication of African Historical Sources | In English | → Associations → Graphic industries, printing, publishing → History |
| APAN | Asia-Pacific Advanced Network Consortium | In English | → Computer science → Telecommunications |
| APAST | Association Africaine Pour l'Avancement des Sciences et Techniques = AAAST | African Association for the Advancement of Science and Technology | In English |
In French | → Associations → Mathematics and natural sciences |
| APAVE | Association des Propriétaires d’Appareils à Vapeur et Électriques | In French | → Associations → Electrical engineering |
| APAVE | Association des Propriétaires d'Appareils à Vapeur ou Électriques | In French | → Organizations and associations → Mechanical engineering |
| APC | American Plastics Council (www.americanplasticscouncil.org) | In English | → Plastic industry |
| APCA | Assemblée Permanente des Chambres d’Agriculture | In French | → Organizations and associations → Agricultural sciences |
| APCA | Assemblée Permanente des Chambres d'Agriculture | In French | → Organizations and associations → Medicine |
| APCC | Australian Procurement and Construction Council | In English | → Organizations and associations → Civil engineering → Building |
| APCC | American Power Conversion Corporation | In English | → Energy economics → Electrical engineering |
| APCC | Association of Professional Computer Consultants | In English | → Computer science → Associations → 6592 |
| APCC | Association of Professional Communication Consultants | In English | → Associations → 6592 |
| APCC | Animal Poison Control Center | In English | → Veterinary medicine |
| APCE | Agence Pour la Création d'Entreprises | In French | → 334 → Engineering, technology |
| ApCM | Applied Composite Materials | In English | → Serial publications, periodicals → 666 |
| APCP | Aerojet Photoelectric Cell Program | In English | → Energy economics → Aeronautics, aircraft |
| APDIS | Associação Portuguesa de Documentação e Informação de Saúde | In Portuguese | → Libraries → Associations → Medicine |
| APDRP | Agenţia de Plăţi pentru Dezvoltare Rurală şi Pescuit (www.apdrp.ro) | In Romanian | → Organizations and associations → Agricultural sciences |
| APE | Agencja Poszanowania Energii | In Polish | → Energy economics |
| APEA | Agencia Provincial de la Energía de Avila | In Spanish | → Energy economics |
| APEA | Agenzia Provinciale Energia ed Ambiente | In Italian | → Nature → Energy economics |
| APEC | Active and Passive Electronic Components | In English | → Serial publications, periodicals → Electronics |
| APECITA | Association Pour l'Emploi des Cadres, Ingénieurs et Techniciens de l'Agriculture | In French | → Associations → Labour, labour economics → Agricultural sciences |
| APEH | Agencia Provincial de la Energía de Huelva | In Spanish | → Energy economics |