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

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, 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

ASA, All Sore Asses
ASA, a measure of film speed in photography, later replaced by the ISO standard
Acrylonitrile styrene acrylate, a plastic polymer
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