SDA

SDA or sda may refer to:

Computing

 * , the first mass-storage disk in Unix-like operating systems
 * T-Mobile SDA, a smartphone
 * Screen Design Aid, a utility program used by midrange IBM computer systems
 * SD Card Association, responsible for Secure Digital memory card standards
 * Serial Data Signal of an I²C electronic bus
 * Slow DoS attack
 * Symbolic data analysis

Life sciences

 * Sabouraud dextrose agar, microbiological media allows fungus to grow
 * Serotonin–dopamine antagonist, atypical antipsychotic
 * Specific dynamic action, the thermic effect of food
 * Stearidonic acid, omega-3 fatty acid
 * Structured digital abstract, describing relationships between biological entities

Other uses in science and technology

 * Scratch drive actuator, a microelectromechanical device
 * Space domain awareness, the ability to detect, track, and characterize passive and active space objects
 * Stereo Dimensional Array, a Polk Audio technology

Educational institutions

 * San Dieguito Academy, Encinitas, California, US
 * SDA Bocconi School of Management, in Milan, Italy

Political groups

 * Secular Democratic Alliance (India)
 * Singapore Democratic Alliance
 * Social Democratic Alliance (UK)
 * Stranka demokratske akcije ("Party of Democratic Action"), in Bosnia and Herzegovina
 * Social Democratic Alliance in Vietnam
 * Party of Democratic Action of Sandžak (Stranka demokratske akcije Sandžaka), a political party in Serbia

Other organizations

 * SD Card Association, responsible for Secure Digital memory card standards
 * Security & Defence Agenda, a Brussels-based think-tank
 * Seventh-day Adventist Church, a Protestant Christian denomination
 * Shop, Distributive and Allied Employees Association, Australia
 * Space Development Agency, a DoD RDT&E agency
 * Systemic Design Association, for systems design
 * Swiss Telegraphic Agency (Schweizerische Depeschenagentur)

Other uses

 * SDA Tennis Open, a tournament held in Bercuit, Belgium
 * Saddam International Airport, airport code SDA
 * Same-day affirmation of financial market deals
 * San Diego and Arizona Railway, reporting mark SDA
 * Severe Disablement Allowance, a UK state benefit
 * Southern Domestic Airspace, Canada
 * Specially denatured alcohol
 * Speed Demos Archive of video game speedruns