| Acronym | Definition |
|---|
| AAS | Associate in Applied Sciences |
| AAS | American Astronomical Society |
| AAS | American Antiquarian Society |
| AAS | African American Studies |
| AAS | Atomic Absorption Spectroscopy |
| AAS | Atomic Absorption Spectrometry |
| AAS | All America Selections |
| AAS | All-America Selections |
| AAS | Asian American Studies |
| AAS | Anabolic Androgenic Steroid |
| AAS | Association for Asian Studies |
| AAS | American Association of Suicidology (Washington, DC) |
| AAS | Atomic Absorption Spectrometer |
| AAS | Atomic Absorption Spectrophotometry |
| AAS | ACTA Apostolicae Sedis |
| AAS | American Astronautical Society |
| AAS | Arnold Air Society |
| AAS | Applied Acoustics Systems |
| AAS | Automobile Association of Singapore |
| AAS | Australian Academy of Science |
| AAS | Australian Accounting Standard |
| AAS | Adopt-A-Stream (Georgia Department of Natural Resources) |
| AAS | Aging and Adult Services |
| AAS | Advanced Automation System |
| AAS | Acide Acétylsalicylique (French: acetylsalicylic acid) |
| AAS | Austrian Academy of Sciences |
| AAS | Alcatel Alenia Space (European space company) |
| AAS | Adaptive Antenna System |
| AAS | Alive and Smiling (internet chat) |
| AAS | American Auditory Society |
| AAS | Advance and Secure (gaming) |
| AAS | Annuaire des Associations de Santé (French: Directory of Health Associations) |
| AAS | Association for Academic Surgery |
| AAS | Aarskog-Scott Syndrome |
| AAS | Academy of Applied Science |
| AAS | Aarskog Syndrome |
| AAS | Air Assault School (US DoD) |
| AAS | Amphibious Assault Ship (US DoD) |
| AAS | Angle, Angle, Side (geometry) |
| AAS | Auto Area Segmentation |
| AAS | Airport Advisory Service |
| AAS | American Academy of Sanitarians |
| AAS | All-To-All Scatter |
| AAS | Arabian Advanced Systems |
| AAS | Assisted Acquisition Services (GSA Office) |
| AAS | Adult Attachment Scale |
| AAS | Assyrian Academic Society |
| AAS | All About Sex |
| AAS | Amos Alonzo Stagg |
| AAS | Ali Al Salem (military air base in Kuwait) |
| AAS | Automated Accounting System |
| AAS | Arkansas Archaeological Survey |
| AAS | Asociación Argentina de Sedimentología (Spanish: Argentine Association of Sedimentology) |
| AAS | Acute Abdominal Series (x-ray type) |
| AAS | American Astrophysical Society |
| AAS | Aeromedical Airlift Squadron |
| AAS | Army Apprentices School (Australia) |
| AAS | Advanced Authoring System (text adventure creation platform) |
| AAS | Application Analysis Solution (Cisco) |
| AAS | Anno Aetatis Suae (Latin: In the Year of His/Her Age) |
| AAS | Australian Association of Surgeons |
| AAS | Assault Amphibian School (US Marine Corps) |
| AAS | Auto Action Service (French automotive repair company) |
| AAS | ASTER Airborne Simulator |
| AAS | Arithmetic Assignment Statement |
| AAS | Aircraft Arresting System |
| AAS | Anterior Atlantoaxial Subluxation |
| AAS | Automatic Announcement Subsystem |
| AAS | Advanced Automated System (FAA) |
| AAS | Automated Answering System |
| AAS | Automatic Algorithm Selection |
| AAS | Association des Amis de la Saoura |
| AAS | All Around Sports (online retailer) |
| AAS | Aide a la Scolarité (French: Help with Schooling) |
| AAS | Acoustic Assessment System |
| AAS | Acid Addition System |
| AAS | Attack Assessment System |
| AAS | All American SportsWare (sports software company) |
| AAS | Anime Appreciation Society (University of Wisconsin–Eau Claire) |
| AAS | Airport Aids Services |
| AAS | Alert Area Supervisor |
| AAS | Alternate Architecture Study |
| AAS | Advanced Array Sensor |
| AAS | Audio Amplifier System |
| AAS | Advanced Academic Strategies |
| AAS | Auto-Available Split/Skill |
| AAS | Amphibious Assault Scenario |
| AAS | Aging Aircraft Subsystem |
| AAS | Another Acronym Site |
| AAS | Application Architecture Solutions (Sprint - Group) |
| AAS | AFTAC Application Software |
| AAS | Automatic Analysis/Addresser System |
| AAS | Advanced Planning System Application Software |
| AAS | Asymmetric Air Support (various armed forces) |
| AAS | Al Ain Association for Development |
| AAS | Alarmes Automatismes Services (French alarm service company) |
| AAS | Altitude/Airspeed Sensor |
| AAS | Apptivity Application Server (Progress Software, Inc.) |
| AAS | Acrylonitrile-Acrylic Rubber-Styrene Copolymer (resin) |
| AAS | Approved As Stands |
| AAS | Annual Activities Summary |
| AAS | American Aerial Survey, Inc. |
| AAS | Accounting Attitude Scale |
| AAS | Ascending Aortic Stenosis |
| AAS | Associate of Arts and Science (various schools) |
| AAS | Academy of Agricultural Sciences (China) |
| AAS | African Academy of Sciences (est. 1985) |
| AAS | Alabama Academy of Science (est. 1924) |
| AAS | African Academy of Sciences (various locations) |
| AAS | Applied Arts Sciences |