| IATIS | International Association for Translation and Intercultural Studies | En la angla | → Lingvistiko |
| A2LA | American Association for Laboratory Accreditation | En la angla | → Serĉadinstitutoj |
| A3P | Association Pour les Produits Propres et stériles (www.a3p.org) | En la franca | → Medicino |
| AA | Aluminium Association | En la angla | → Metalurgio |
| AA | Alzheimer's Association | En la angla | → Medicino |
| AAA | Age Anaesthesia Association | En la angla | → Anesteziologio |
| AAA | American Allergy Association | En la angla | → Imunologio kaj alergio |
| AAA | American Association of Anatomists | En la angla | → Anatomio |
| AAA | Asociación Argentina de Astronomía (www.astronomiaargentina.org.ar) | En la hispana | → Astronomio |
| AAA | American Anthropological Association (www.aaanet.org) | En la angla | → Antropologio |
| AAA | Association des Anciens d'Alpine | En la franca | → Veturila inĝenierado |
| AAA | American Arbitration Association | En la angla | → Leĝo, jurisprudenco |
| AAA | Association Alopecia Areata | En la franca | → Patologio |
| AAA | Association des Auteurs Autoédités | En la franca | → Lingvo, lingvistiko, literaturo → Grafika industrio, presado, eldono |
| AAA | Association des Astronautes Autonomes | En la franca | → Astronomio → Spacfluga inĝenierado, astronaŭtiko |
| AAA | Associazione Amici di Angal | En la itala | |
| AAAAA | Association Amicale des Amateurs d’Andouillette Authentique | En la franca | → Teĥnologioj de nutraĵoj → 641 |
| AAAASF | American Association for Accreditation of Ambulatory Surgery Facilities | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAABEM | American Association of Acupuncture and Bio-Energetic Medicine | En la angla | → Medicino |
| AAAdEM | Afgana Amika Asocio de Esperanto-Movado | En Esperanto | |
| AAAH | American Association of Alternative Healers | En la angla | → Medicino |
| AAAHC | Accreditation Association for Ambulatory Health Care | En la angla | → Medicino |
| AAAI | American Association for Artificial Intelligence (www.aaai.org) | En la angla | → Artefarita inteligenteco |
| AAALAC | Association for Assessment and Accreditation of Laboratory Animal Care International | En la angla | → Medicino |
| AAALF | American Association for Active Lifestyles and Fitness | En la angla | → Medicino |
| AAAM | Association for the Advancement of Automotive Medicine | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAAS | American Association for the Advancement of Science | En la angla | → Matematikoj kaj naturaj sciencoj |
| AAAST | African Association for the Advancement of Science and Technology = APAST | Association Africaine Pour l'Avancement des Sciences et Techniques | En la franca |
En la angla | → Matematikoj kaj naturaj sciencoj → Aplikitaj sciencoj, teĥnologio |
| AABA | American Anorexia Bulimia Association | En la angla | → Patologio |
| AABB | American Association of Blood Banks | En la angla | → Sango kaj angioj |
| AABH | Association for Ambulatory Behavioral Healthcare | En la angla | → Medicino |
| AABIC | Association for the Advancement of Brain Injured Children | En la angla | → Neŭrologio → Pediatrio |
| AABP | American Association of Bovine Practitioners (www.aabp.org) | En la angla | → Bestkurado → Terkultivadaj sciencoj |
| AAC | Association des Amidonneries de Céréales de l'Union Européenne (www.aac-eu.org) | En la franca | → Teĥnologioj de nutraĵoj |
| AACA | Authentic Artifact Collectors Association | En la angla | |
| AACA | Asian American Civic Association | En la angla | → 358 |
| AACA | Atlanta Area Compensation Association | En la angla | |
| AACA | Australian Association of Consulting Archaeologists | En la angla | → Arkeologio |
| AACA | Australasian Association of Campus Activities | En la angla | |
| AACA | Army Air Corps Association | En la angla | → 359 |
| AAcA | Australian Acupuncture Association | En la angla | → Medicino |
| AACB | Australasian Association of Clinical Biochemists | En la angla | → Bioĥemio, biofiziko → Medicino |
| AACC | American Association for Continuity of Care | En la angla | → Medicino |
| AACC | American Association for Clinical Chemistry | En la angla | → Farmakologio, toksologio |
| AACDP | American Association of Chairs of Departments of Psychiatry | En la angla | → Psikiatrio |
| AACE | American Association for Cancer Education | En la angla | → Edukado → Onkologio |
| AACE | American Association of Clinical Endocrinologists | En la angla | → Fiziologio |
| AACMA | Australian Acupuncture and Chinese Medicine Association | En la angla | → Medicino |
| AACMHP | American Association of Community Mental Health Center Psychiatrists | En la angla | → Psikiatrio |
| AACN | American Association of Colleges of Nursing | En la angla | → Medicino |
| AACN | American Association of Critical-Care Nurses | En la angla | → Traŭmatologio |
| AACOM | American Association of Colleges of Osteopathic Medicine | En la angla | → Medicino |
| AACOMAS | American Association of Colleges of Osteopathic Medicine Applications Service | En la angla | → Medicino |
| AACP | American Association of Colleges of Pharmacy | En la angla | → Farmakologio, toksologio |
| AACP | American Association of Community Psychiatrists | En la angla | → Psikiatrio |
| AACPM | American Association of Colleges of Podiatric Medicine | En la angla | → Medicino |
| AACPMAS | American Association of Colleges of Podiatric Medicine Application Service | En la angla | → Medicino |
| AACR | American Association for Cancer Research | En la angla | → Onkologio |
| AACRC | American Association of Children's Residential Centers | En la angla | → Pediatrio |
| AACU | American Association of Clinical Urologists | En la angla | → Urologio |
| AACVPR | American Association of Cardiovascular and Pulmonary Rehabilitation | En la angla | → Kardiologio → Torakaj malsanoj |
| AAD | Australian Association of the Deaf | En la angla | |
| AADB | American Association of the Deaf-Blind | En la angla | |
| AADE | American Association of Diabetes Educators | En la angla | → Medicino |
| AADE | American Association of Dental Examiners | En la angla | → Dentkurado |
| AADE | American Association of Dental Editors | En la angla | → Dentkurado |
| AADPRT | American Association of Directors of Psychiatric Residency Training | En la angla | → Edukado → Psikiatrio |
| AADW | American Association of Dental Webmasters | En la angla | → Interreto → Dentkurado |
| AAEI | Association pour l'Avancement des Études Islamiques | En la franca | → Islamo |
| AAEP | American Association of Equine Practitioners (www.aaep.org) | En la angla | → Bestkurado |
| AAFDP | Association Aux Frontières Du Pixel | En la franca | → Komputilo-bazitaj teknikoj → Artoj |
| AAFHV | American Association of Food Hygiene Veterinarians (www.avma.org/aafhv/) | En la angla | → Bestkurado |
| AAFP | American Association of Feline Practitioners (www.aafponline.org) | En la angla | → Bestkurado |
| AAGBI | Association of Anaesthetists of Great Britain and Ireland | En la angla | → 61789 |
| AAGHP | American Association of General Hospital Psychiatrists | En la angla | → Psikiatrio |
| AAGP | American Association for Geriatric Psychiatry | En la angla | → Psikiatrio → Gerontologio |
| AAGS | Alberta Association of General Surgeons | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAGT | Association for the Advancement of Gestalt Therapy | En la angla | → Medicino |
| AAH | Association of Ancient Historians | En la angla | → Historio |
| AAHA | American Association of Homes for the Aging | En la angla | → Gerontologio |
| AAHA | American Animal Hospital Association (www.aahanet.org) | En la angla | → Bestkurado |
| AAHAM | American Association of Health Care Administrative Management | En la angla | → Medicino → Mastrumado |
| AAHBA | Athens Area Home Builders Association | En la angla | → Konstruado |
| AAHC | American Association for History and Computing | En la angla | → Komputiko → Historio |
| AAHC | American Association of Healthcare Consultants | En la angla | → Medicino |
| AAHD | American Association of Hospital Dentists | En la angla | → Dentkurado |
| AAHE | American Association for Health Education | En la angla | → Edukado → Medicino |
| AAHKS | American Association of Hip and Knee Surgeons | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAHM | American Association for the History of Medicine | En la angla | → Medicino → Historio |
| AAHN | American Association for the History of Nursing | En la angla | → Medicino → Historio |
| AAHP | American Association of Health Plans | En la angla | → Medicino |
| AAHPC | Australian Association for Hospice and Palliative Care | En la angla | → Gerontologio |
| AAHRPP | Association for the Accreditation of Human Research Protection Programs | En la angla | → Medicino |
| AAHS | American Association for Hand Surgery | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAHSA | American Association of Homes and Services for the Aging | En la angla | → Medicino |
| AAHSL | Association of Academic Health Sciences Libraries | En la angla | → Libraroj → Medicino |
| AAHSLD | Association of Academic Health Sciences Library Directors | En la angla | → Libraroj → Medicino |
| AAHSTO | American Association of State Highway and Transportation Officials | En la angla | → Transporto kaj poŝtaj servoj |
| AAI | American Association of Immunologists | En la angla | → Imunologio kaj alergio |
| AAIHDS | American Association of Integrated Healthcare Delivery Systems | En la angla | → Medicino |
| AAIM | Asociación Argentina de Informática Médica | En la hispana | → Komputiko → Medicino |
| AAIM | Association for Applied Interactive Multimedia | En la angla | → Komputiko → Telekomunikado |
| AAIMHI | Australian Association of Infant Mental Health | En la angla | → Psikiatrio |
| AAIP | Association of American Indian Physicians | En la angla | → Medicino |
| AAIQ | Association des Allergologues et Immunologues du Québec | En la franca | → Imunologio kaj alergio |
| AAIR | Asociaţia pentru Automatizări şi Instrumentaţie din România | En la rumana | → Mekanika inĝenierado |
| AAIS | American Association of Italian Studies (www.aais.info) | En la angla | → Lingvo, lingvistiko, literaturo |
| AAKP | American Association of Kidney Patients | En la angla | → Medicino |
| AALA | American Association for Laboratory Accreditation | En la angla | → Serĉadinstitutoj |
| AALAS | American Association for Laboratory Animal Science (www.aalas.org) | En la angla | → Bestkurado |
| AALMA | Associazione America Latina Messico Asia | En la itala | |
| AALNC | American Association of Legal Nurse Consultants | En la angla | → Medicino |
| AAM | Association des Auteurs Multimédias | En la franca | → Komputiko → Artoj |
| AAMA | American Association of Medical Assistants | En la angla | → Medicino |
| AAMAS | American Association of Medical Audit Specialists | En la angla | → Medicino |
| AAMC | Association of American Medical Colleges | En la angla | → Altedukado, universitatoj → Medicino |
| AAMCN | American Association of Managed Care Nurses | En la angla | → Medicino |
| AAMCT | Associazione Assistenti Montatori Cinematografici e Televisivi | En la itala | → Kino, filmoj → Telekomunikado |
| AAMD | American Association of Medical Dosimetrists | En la angla | → Medicino |
| AAMFT | American Association for Marriage and Family Therapy | En la angla | → Psikologio |
| AAMI | Association for the Advancement of Medical Instrumentation | En la angla | → Medicino |
| AAMI | Association des Anciens Médecins Internes de l'Hôpital de Périgueux | En la franca | → Medicino |
| AAMMA | Asociación Argentina de Médicos por el Medio Ambiente | En la hispana | → Medicino |
| AAMP | Association pour l'Aide à la Médecine Préventive | En la franca | → Medicino |
| AAMR | American Association on Mental Retardation | En la angla | → Neŭrologio |
| AAMRO | American Association of Medical Review Officers | En la angla | → Medicino |
| AAMRT | Alberta Association of Medical Radiation Technologists | En la angla | → 61584 |
| AAMS | Association of Air Medical Services | En la angla | → Medicino |
| AAMSI | American Association for Medical Systems and Informatics | En la angla | → Komputiko → Medicino |
| AAMT | American Association for Medical Transcription | En la angla | → Medicino |
| AAMT | American Association for Music Therapy | En la angla | → Medicino → Muziko |
| AAMVA | American Automobile Motor Vehicle Association | En la angla | → Aŭtomobila inĝenierado |
| AANA | American Association of Nurse Anesthetists | En la angla | → Anesteziologio |
| AANA | American Arab Nurses Association | En la angla | → Medicino |
| AANA | Arthroscopy Association of North America | En la angla | → Medicino |
| AANE | American Association of Nurse Executives | En la angla | → Medicino |
| AANN | American Association of Neuroscience Nurses | En la angla | → Neŭrologio |
| AANNT | American Association of Nephrology Nurses and Technicians | En la angla | → Medicino |
| AANP | American Association of Neuropathologists | En la angla | → Neŭrologio |
| AANP | American Association of Naturopathic Physicians | En la angla | → Neŭrologio |
| AANS | American Association of Neurological Surgeons | En la angla | → Neŭrologio → Kirurgio, ortopedio, oftalmologio |
| AAO | Alberta Association of Optometrists | En la angla | → Oftalmologio |
| AAO | American Association of Orthodontists | En la angla | → Dentkurado |
| AAOB | American Association of Oral Biologists | En la angla | → Biologiaj sciencoj |
| AAOHN | American Association of Occupational Health Nurses | En la angla | → Laboro, laborekonomio → Medicino |
| AAOM | American Association of Oriental Medicine | En la angla | → Medicino |
| AAOM | Association of Assessing Officers of Manitoba (www.aaom.mb.ca) | En la angla | → 332 |
| AAOMS | American Association of Oral & Maxillofacial Surgeons | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAON | American Association of Office Nurses | En la angla | → Medicino |
| AAOPAC | American Association of Orthodontists Political Action Committee | En la angla | → Politiko → Kirurgio, ortopedio, oftalmologio |
| AAOT | Asociación Argentina de Ortopedia y Traumatología | En la hispana | → Kirurgio, ortopedio, oftalmologio |
| AAP | Association for Academic Psychiatry | En la angla | → Psikiatrio |
| AAP | Association of American Physicians | En la angla | → Medicino |
| AAP | Association of Academic Physiatrists | En la angla | → Psikiatrio |
| AAP | Association for the Advancement of Psychotherapy | En la angla | → Psikologio → Medicino |
| AAP | Association for the Advancement of Psychoanalysis | En la angla | → Psikologio |
| AAPA | Asian American Psychological Association | En la angla | → Psikologio |
| AAPA | American Association of Psychiatric Administrators | En la angla | → Mastrumado → Psikiatrio |
| AAPAA | American Association of Psychiatrists in Alcoholism and Addictions | En la angla | → Psikiatrio |
| AAPB | Association for Applied Psychophysiology and Biofeedback | En la angla | → Psikologio → Fiziologio |
| AAPC | American Association of Pastoral Counselors | En la angla | → Medicino |
| AAPCC | American Association of Poison Control Centers | En la angla | → 6159 |
| AAPCHO | Association of Asian Pacific Community Health Organizations | En la angla | → Medicino |
| AAPD | American Association of People with Disabilities | En la angla | |
| AAPH | American Association for Partial Hospitalization | En la angla | → Medicino |
| AAPH | Association for the Advancement of Private Health | En la angla | → Publikaj sano kaj higieno |
| AAPHD | American Association of Public Health Dentistry | En la angla | → Dentkurado |
| AAPHR | American Association of Physicians for Human Rights | En la angla | → Fundamentaj rajtoj → Medicino |
| AAPHV | American Association of Public Health Veterinarians | En la angla | → Bestkurado |
| AAPI | American Association of the Physicians of Indian Origin | En la angla | → Medicino |
| AAPI | Association d'Aide aux Personnes Incontinentes | En la franca | → Medicino |
| AAPIL | Association pour un Avenir Professionnel des Infirmiers Libéraux | En la franca | → Medicino |
| AAPM | American Association of Physicists in Medicine | En la angla | → Medicino |
| AAPOS | American Association for Pediatric Ophthalmology and Strabismus | En la angla | → Oftalmologio → Pediatrio |
| AAPPMA | Association Agréée de Pêche et de Protection des Milieux Aquatiques | En la franca | → Naturo → Fiŝkaptado, ĉasado |
| AAPPO | American Association of Preferred Provider Organizations | En la angla | |
| AAPS | American Association of Pharmaceutical Scientists | En la angla | → Farmakologio, toksologio |
| AAPS | American Association of Physician Specialists | En la angla | → Medicino |
| AAPS | American Association of Pharmaceutical Sciences (www.aapspharmaceutica.com) | En la angla | → Farmakologio, toksologio |
| AAPSC | American Association of Psychiatric Services for Children | En la angla | → Psikiatrio → Pediatrio |
| AAPTC | Australian Association of Paediatric Teaching Centres | En la angla | → Medicino |
| AAQ | Association d'Acupuncture du Québec | En la franca | → Medicino |
| AAQTE | Association pour l'Assurance Qualité en Thérapeutique et l'Évaluation | En la franca | → Kvalitregulado → Farmakologio, toksologio |
| AAR | Association of American Railroads | En la angla | → Transporto kaj poŝtaj servoj |
| AAR | Association of Artists' Representatives | En la angla | → Artoj |
| AAR | Association Aéronautique de Rochecourbe | En la franca | → Aeronaŭtiko, aviadiloj |
| AARC | American Association for Respiratory Care | En la angla | → Patologio |
| AARDA | American Autoimmune Related Diseases Association | En la angla | → Patologio |
| AARN | Association for Australian Rural Nurses | En la angla | → Medicino |
| AARP | American Association of Retired Persons | En la angla | → Laboro, laborekonomio |
| AART | American Association for Respiratory Therapy | En la angla | → Torakaj malsanoj |
| AAS | American Association of Suicidology | En la angla | → Psikiatrio |
| AAS | Association for Academic Surgery | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AAS | Australian Association of Surgeons | En la angla | → Kirurgio, ortopedio, oftalmologio |
| AASA | Association des Aides-Soignants d'Auvergne | En la franca | → 61425 |
| AASCIN | American Association of Spinal Cord Injury Nurses | En la angla | → 61425 → Traŭmatologio |
| AASCIPSW | American Association of Spinal Cord Injury Psychologists and Social Workers | En la angla | → Neŭrologio → Traŭmatologio |
| AASECT | American Association of Sex Educators, Counselors and Therapists | En la angla | → 6138 |
| AASH | American Association for the Study of Headache | En la angla | → Neŭrologio |
| AASLD | American Association for the Study of Liver Diseases | En la angla | → 6113 |