1. Academy of Nutrition and Dietetics (formerly the American Dietetic Association)
  2. Acoustical Society of America
  3. Alaska Native Science Commission
  4. Alberta Society of Professional Biologists
  5. All European Academies (ALLEA)
  6. American Academy of Forensic Sciences
  7. American Academy of Microbiology
  8. American Alliance for Health, Physical Education, Recreation and Dance
  9. American Alliance of Museums
  10. American Anthropological Association
  11. American Association for Clinical Chemistry
  12. American Association for the Advancement of Science
  13. American Association of Petroleum Geologists
  14. American Association of Physical Anthropologists
  15. American Association of Physicists in Medicine