SDR
- ETSI Satellite Digital Radio
- QRIO
- SDR (audio)
- Sales development representative
- Santander Airport
- School District of Reedsburg
- Selective dorsal rhizotomy
- Short-chain dehydrogenase
- SmartDraw
- Social discount rate
- Software-defined radio
- Somali Democratic Republic
- South Devon Railway (heritage railway)
- Southern Distributor Road
- Sparse distributed representation
- Special drawing rights
- Standard dimension ratio
- Standard-dynamic-range video
- Stardust Promotion
- Strategic Defence Review (disambiguation)
- Swiss Derivatives Review
- System design review
- System of distinct representatives
- Süddeutscher Rundfunk