SDR may refer to:

Places[link]

• Santander, Cantabria
• Santander Airport, IATA airport code
• Somalia, previously known as the Somali Democratic Republic
• Southern Distributor Road, part of the Newport ring road in the United Kingdom
• Snailbeach District Railways, a mine railway in Shropshire, England
• Somerset and Dorset Joint Railway, defunct British railway system
• São Domingos de Rana, a parish in Cascais, Portugal

Reports and reviews[link]

• Strategic Defence Review, a United Kingdom Ministry of Defence defence review
• System Design Review, a scheduled review which ensures continuous involvement throughout a program
• Swiss Derivatives Review, a magazine for the futures and options industries

Economics, maths and science[link]

• System of distinct representatives, in mathematics
• Special drawing rights, in the International Monetary Fund
• Social discount rate, a measure of the value of diverting funds to social projects
• Selective dorsal rhizotomy, a neurosurgery

Technology[link]

• ETSI Satellite Digital Radio
• Single data rate synchronous dynamic random access memory (SDRAM), a transfer mode for a data bus, in which there is a single data transfer per full clock cycle
• Software-defined radio, radio communication system which uses software for the modulation and demodulation of radio signals
• QRIO, originally named SDR for "Sony Dream Robot", an entertainment robot
• XDR (audio) or Super Dynamic Range, a quality-control process for extending the recording quality of cassettes
• Standard Dimension Ratio, method of rating pressure piping. The SDR is the ratio of pipe diameter to wall thickness and the SDR can be expressed as

Failed to parse (Missing texvc executable; please see math/README to configure.): SDR = \dfrac{D}{s}

where D = pipe outside diameter (mm), and s = pipe wall thickness (mm) engineeringtoolbox.com SDR

Entertainment[link]

• Süddeutscher Rundfunk, a former German radio station
• Sudden Death Records

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