RIAS
- Deutsches Symphonie-Orchester Berlin
- RIA (disambiguation)
- RIAS Kammerchor
- Recording Industry Association Singapore
- Regulatory impact analysis statement
- Remote infrared audible signage
- Research Institute for Advanced Studies
- Reynolds Intellectual Assessment Scales
- Rias Gremory
- Rias Line
- Royal Incorporation of Architects in Scotland
- Rundfunk im amerikanischen Sektor
- Rías Altas
- Rías Baixas