AAS

Aas or AAS may refer to:

Businesses

Ateliers Aéronautiques de Suresnes, a defunct French aircraft manufacturing company
Alcatel Alenia Space, an aerospace company; now Thales Alenia Space
Austrian Air Services, a defunct airline from Austria (ICAO designator)

African Academy of Sciences , an Africa-wide scientific organization
Air Ambulance Service, a UK charity
All-America Selections, an organization that promotes development of new garden seed varieties
American Antiquarian Society, an American society and national research library
American Anti-Slavery Society
American Arachnological Society, a society of amateur and professional arachnologists
American Association of Suicidology, an American nonprofit suicide prevention organization
American Astronautical Society, an independent scientific and technical group in the United States
American Astronomical Society, a United States society of professional astronomers
Ansar al-Sunna, or Jamaat Ansar al-Sunna, a militant group operating in Iraq
Arnold Air Society, a professional honorary service organization for Air Force officer candidates
Association for Academic Surgery
Association for Asian Studies
Assyrian Academic Society
Assyrian Aid Society
Australian Academy of Science, an independent, government-endorsed society with the aim of promoting science
Australian Anthropological Society