RIAS or Rias may refer to:
- Recording Industry Association Singapore
- Regulatory Impact Analysis Statement, a description of the impact of new Canadian federal regulations
- Remote Infrared Audible Signage
- Research Institute for Advanced Studies, the former research facility created by the Glenn L. Martin Company
- Reynolds Intellectual Assessment Scales, an intelligence test
- Royal Incorporation of Architects in Scotland, a professional body
- Rundfunk im amerikanischen Sektor (Broadcasting in the American Sector), a radio and television station in West Berlin, Germany
- RIAS Symphonie-Orchester, now called the Deutsches Symphonie-Orchester Berlin, is a broadcast orchestra based in Berlin
- RIAS Kammerchor, a choir founded as a radio choir and based in Berlin
- Rias Gremory, a fictional character in the High School DxD franchise
- Rias Line, a railway line in Japan
See also
- RIA (disambiguation)
- Rías Altas, a section of A Costa do Marisco (the Seafood Coast) in Galicia, Spain
- Rías Baixas, a series of four estuarine inlets located on the southwestern coast of Galicia, Spain
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