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

• 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

This disambiguation page lists articles associated with the title RIAS.
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