ASD

ASD can refer to:

Biology and medicine

• Acute stress disorder, a psychiatric disorder
• Atrial septal defect, a medical condition affecting the heart
• Autism spectrum disorder, a brain development disorder

Computing, engineering, technology, and transport

• Accredited Symbian Developer, a qualification for developers of software for Symbian OS
• Adaptive Software Development, a software development process
• Adjustable-speed drive used to control electrical engine's speed
• Aigle - Sepey - Diablerets, a Swiss mountain railway
• Allowable stress design, a structural design methodology
• Andromeda Software Development, a Greek demogroup
• ASDF (sequence of letters), the leftmost home row keys on a QWERTY keyboard
• Azimuthing stern drive, a drive/direction system for state of the art "tractor" tugboats

Literature

• A Scanner Darkly, a 1977 novel by Philip K. Dick

Social sciences and society

• After school detention, detention held after school
• American School for the Deaf in Hartford, Connecticut
• American School of Dubai, an educational institute located in Dubai, United Arab Emirates
• American Standard Companies, a global provider of air conditioning systems
• Anchorage School District, the district of schools in Anchorage, Alaska