SDR

SDR may refer to:

Science and technology

 * ETSI Satellite Digital Radio
 * Selective dorsal rhizotomy, a neurosurgery
 * Short-chain dehydrogenase, short-chain dehydrogenases/reductases family, SDR family
 * Single data rate, in synchronous dynamic random-access memory (SDRAM)
 * SmartDraw image file format, with file extension
 * Software-defined radio, enabling computers to tune a wide spectrum of radio frequencies, using software instead of hardware for modulation and demodulation
 * Sony Dream Robot, later dubbed QRIO
 * Sparse distributed representation, in machine intelligence
 * Standard dimension ratio in pipe engineering
 * Standard-dynamic-range video, color clarity and realism in images and videos, the current standard for video and cinema displays
 * Super Dynamic Range, SDR (audio) or XDR, an encoding system for audio cassettes
 * System of distinct representatives, in mathematics

Economics

 * Special drawing rights, foreign-exchange reserve assets overseen by the IMF
 * Social discount rate, a measure of the value of diverting funds to social projects

Media and entertainment

 * Stardust Records, a Stardust Promotion label
 * Süddeutscher Rundfunk, former public broadcaster in Germany, then merged into Südwestrundfunk (SWR)
 * Swiss Derivatives Review, a magazine for the futures and options industries

Military

 * Strategic Defence Review, of the UK MoD
 * System Design Review of a program, US

Places

 * Santander Airport (IATA airport code)
 * Somali Democratic Republic
 * Southern Distributor Road, Newport, Wales

Other uses

 * Sales development representative
 * School District of Reedsburg
 * South Devon Railway, a heritage railway in England