ASD

ASD most often refers to:
 * Autism spectrum disorder, a neurodevelopmental condition
 * Acute stress disorder, a psychological response

ASD may also refer to:

Biology

 * ASD (database), an online directory of allosteric proteins and their structure
 * Asd RNA motif, a structure in lactic-acid bacterium ribonucleic acid
 * Aspartate-semialdehyde dehydrogenase, an amino-acid-synthesising enzyme in plants, fungi and bacteria

Medicine

 * Antiseizure drug, an epilepsy medication
 * Antiseptic Dorogov's Stimulator, a Russian topical veterinary drug
 * Arthroscopic subacromial decompression, a surgical procedure on the shoulder
 * Atrial septal defect, a congenital heart defect

Computing

 * Accredited Symbian Developer, a computer programming qualification
 * Adaptive software development, a software development process
 * Aircraft and Scenery Designer, an add-on for the Microsoft Flight Simulator 4.0 video game


 * Application Specific Device, a Wi-Fi certification type

Other uses in science and technology

 * Active sound design, a technology used in cars to alter or enhance the sound inside and outside of the vehicle
 * Adjustable-speed drive, of an electric motor
 * Allowable stress design, a structural design methodology
 * Aspirating smoke detector, an indoor fire-protection device
 * Acceleration spectral density, a mechanical vibration test parameter

Transport

 * Aeronautical Systems Division (1961-1992), US Air Force technical division
 * Air Sinai, by ICAO code
 * Amsterdam Centraal railway station, station code
 * Andros Town International Airport, by IATA code
 * Slidell Airport, by FAA LID

United States

 * Academy for Science and Design, Nashua, New Hampshire
 * Alabama School for the Deaf, part of the Alabama Institute for Deaf and Blind
 * Allentown School District, Pennsylvania
 * American School for the Deaf, West Hartford, Connecticut
 * Anchorage School District, Alaska
 * Armstrong School District (Pennsylvania)
 * Ashland School District (Oregon)
 * Avondale School District, Auburn Hills, Michigan

Other places

 * American School of Doha, Qatar
 * American School of Douala, Cameroon
 * American School of Dubai

Government and politics

 * AeroSpace and Defence Industries Association of Europe, a European business association
 * Alliance for Securing Democracy, a trans-Atlantic group
 * Alliance for Social Democracy, a political party in Benin
 * Architectural Services Department, Hong Kong
 * Australian Signals Directorate, intelligence agency
 * United States Assistant Secretary of Defense, one of several senior US Department of Defense officials

Other uses

 * ASD (album), 2015, by A Skylit Drive, an American band
 * Asas language, by its ISO 639 code
 * A. S. Byatt (born 1936), English critic, novelist, poet and short story writer, who was born Antonia Susan Drabble and whose married name is Antonia Susan Duffy
 * Association for the Study of Dreams