AAS

Aas or AAS may refer to:

• Aas (surname)
• Aas, Pyrénées-Atlantiques, a village in France

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)

Organizations

• Air Ambulance Service, a UK charity
• American Antiquarian Society, an American society and national research library
• American Arachnological Society, a society of amateur and professional arachnologists
• American Astronautical Society, an independent scientific and technical group in the United States
• American Astronomical Society, a United States society of professional astronomers
• American Association of Suicidology, an American nonprofit suicide prevention organization
• 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

In business

• Audit and Assurance Standards issued by ICAI, the Institute of Chartered Accountants of India

In science, mathematics, and technology

• Asymptotically almost surely
• Angle-Angle-Side, see congruence (geometry)
• Atomic absorption spectroscopy, for quantitative determination of chemical elements
• ASCII Adjust after Subtraction, an x86 Intel BCD opcode

In medicine

• Anabolic–androgenic steroid, or simply anabolic steroid

Other uses

• A.a.s (art group), a British-based art collective
• Acta Apostolicae Sedis, the official commentary of the Holy See/Vatican City State
• Apalapsili Airport in Apalapsili, Indonesia, IATA code
• Armed Aerial Scout a U.S. Army replacement program for the OH-58 Kiowa
• Asa language, an extinct language of Tanzania, ISO 639-3 code
• Taylor County Airport (Kentucky), Campbellsville, US, FAA LID
• Sony Auto-lock Accessory Shoe, on camera