RIAS

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