Organizations
- Abandon All Ships, a Canadian band signed to Universal Music and Rise Records
- Air Ambulance Service, a UK charity that operates air ambulances
- American Antiquarian Society, a society and national research library of pre-twentieth century American history and culture
- American Arachnological Society, a society of amateur and professional arachnologists, publishes the Journal of Arachnology
- American Astronautical Society
- American Astronomical Society, a United States society of professional astronomers
- Arnold Air Society, a professional honorary service organization for Air Force officer candidates
- Australian Academy of Science, an independent, government-endorsed society with the aim of promoting science
- Australian Anthropological Society
- American Anti-Slavery Society
- All-America Selections, an organization that promotes development of new garden seed varieties
- Association for Academic Surgery
- Association for Asian Studies
- Assyrian Aid Society
- Assyrian Academic Society
- Jamaat Ansar al-Sunna, or Ansar al-Sunna, a militant group operating in Iraq
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