ASA

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