ASA as an abbreviation or initialism may refer to:
Biology and medicine
- Accessible surface area of a biomolecule, accessible to a solvent
 - Acetylsalicylic acid, aspirin
 - Advanced surface ablation, refractive eye surgery
 - Anterior spinal artery, the blood vessel which supplies the anterior portion of the spinal cord
 - Antisperm antibodies, antibodies against sperm antigens
 - Argininosuccinic aciduria, a disorder of the urea cycle
 - ASA physical status classification system, rating of patients undergoing anesthesia
 
Education and research
- African Studies Association of the United Kingdom
 - African Studies Association
 - Alandica Shipping Academy, Åland Islands, Finland
 - Albany Students' Association, at Massey University, Auckland, New Zealand
 - Alexander-Smith Academy, in Houston, Texas
 - Alpha Sigma Alpha, U.S. national sorority
 - American Society for Aesthetics, philosophical organization
 - American Student Assistance, national non-profit organization
 - American Studies Association
 - Arizona School for the Arts
 - Armenian Sisters Academy
 - Association of Social Anthropologists
 - Astronomical Society of Australia
 - Austrian Studies Association
 
Organizations
- Acoustical Society of America, international scientific society
 - Advertising Standards Authority (disambiguation), advertising regulators in several countries
 - American Scientific Affiliation, an organization of Christians in science
 - American Society of Agronomy
 - American Society of Anesthesiologists
 - American Society of Appraisers
 - American Sociological Association
 - American Staffing Association
 - American Standards Association, a former name of the American National Standards Institute
 - American Statistical Association
 - American Synesthesia Association
 - Americans for Safe Access, marijuana law reform group
 - Association for Social Advancement, microfinance institution, Bangladesh
 - Association for the Study of Abortion
 - Association of Scouts of Azerbaijan
 - Association of Southeast Asia
 - Australian Submarine Agency
 - Australian Society of Authors
 - Australian Space Agency
 - Austrian Service Abroad
 - Autism Society of America
 - United States Army Security Agency
 
Sports
- Agremiação Sportiva Arapiraquense, Brazilian soccer club
 - Alliance Sport Alsace, French basketball club
 - Amateur Softball Association, former name of the governing body now known as USA Softball
 - Amateur Swimming Association, former name of Swim England
 - American Sailing Association
 - American Samoa, IOC country code
 - American Speed Association, motorsports sanctioning body
 - American Sportscasters Association
 - Arizona Soccer Association
 - Athletics South Africa, the national governing body for the sport of athletics in South Africa
 - Atlético Sport Aviação, Angolan multisports club
 - United States Adult Soccer Association
 
Transportation
- ASA (automobile), Italian marque of automobiles (Autocostruzioni Società per Azioni)
 - ASA Aluminium Body, Argentinian manufacturer of replicas of sports cars
 - Aeropuertos y Servicios Auxiliares, Mexican airport operator
 - African Safari Airways, airline company based in East Africa
 - Air services agreement, bilateral agreement to allow international commercial air transport services between signatories
 - Atlantic Southeast Airlines, in Atlanta area, Georgia
 - Airline Superintendents Association, of Trinidad & Tobago
 - Airservices Australia, air traffic management and related services provider for Australia
 - The International Civil Aviation Organization's code for Alaska Airlines
 
Other
- ASA ("American Standards Association") a measure of film speed in photography, later replaced by the ISO standard
 - Acrylonitrile styrene acrylate, a thermoplastic used for 3D printing and in the auto industry
 - Adaptive simulated annealing, optimization algorithm
 - Cisco ASA (Adaptive Security Appliances)
 - Allied States of America, a fictional American nation in the television show Jericho
 - Allmennaksjeselskap, the designation for a Norwegian public limited company
 - Anti-Soviet agitation, a criminal offense in the Soviet Union
 - ASA carriage control characters, a system used for controlling mainframe line printers
 - Assistant state's attorney, a title for attorneys working in the state's attorney's office in the United States
 - As-salamu alaykum, a greeting in Arabic that means "peace be upon you"
 - Auditory scene analysis, a proposed model for the basis of auditory perception
 
See also
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