SDA or sda may refer to:

Science and technology

Computing

  • <code>/dev/sda</code>, 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
  • SDA (drug), an entactogen drug related to MDA
  • 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

Organizations

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)
  • Social Democratic Alliance in Vietnam
  • South Devon Alliance in England
  • Party of Democratic Action (), a political party in Bosnia and Herzegovina

Other organizations

  • Security & Defence Agenda, a Brussels-based think-tank
  • Seventh-day Adventist Church, a Protestant Christian denomination
  • Shandong Airlines, an airline in China
  • Shop, Distributive and Allied Employees Association, Australia
  • Southern Dames of America, lineage society in the United States
  • Space Development Agency, a US DoD RDT&E agency
  • Systemic Design Association, for systems design
  • Swiss Telegraphic Agency ()

Other uses

  • SDA Tennis Open, a tournament held in Bercuit, Belgium
  • Saddam International Airport, now Baghdad 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