| Acronym | Definition |
|---|
| RIS➣Radiology Information System |
| RIS➣Regulatory Impact Statement |
| RIS➣Republik Indonesia Serikat (Indonesian: Republic of Indonesia) |
| RIS➣Remote Installation Service (Microsoft Windows 2000) |
| RIS➣Release in Specific (US DoD) |
| RIS➣Refugee and Immigration Services (various locations) |
| RIS➣Ruamrudee International School (Thailand) |
| RIS➣Radio Interference Suppression |
| RIS➣River Information Services |
| RIS➣Raads Informatie Systeem (Dutch: Wire Information System) |
| RIS➣Research and Information System (India) |
| RIS➣Reduced Instruction Set |
| RIS➣Remote Installation Server |
| RIS➣Raster Image Set |
| RIS➣Research and Instructional Support |
| RIS➣Recoverable in-Doubt Structure |
| RIS➣Radio Information Service |
| RIS➣Retail Information System |
| RIS➣Remote Installation Service |
| RIS➣Regulatory Issue Summary (various organizations) |
| RIS➣Robotics Invention System (LEGO) |
| RIS➣Reviving the Islamic Spirit (conference) |
| RIS➣Ramsar Information Sheet (Ramsar Convention on Wetlands) |
| RIS➣Raba Interneta v Sloveniji (Slovenian: Internet Research in Slovenia) |
| RIS➣Rail Interface System |
| RIS➣Russian Imperial Stout |
| RIS➣Rainbow International School (Seoul, South Korea) |
| RIS➣Regulatory Information Service |
| RIS➣Regional Innovation Strategy (European Commission) |
| RIS➣Research and Instructional Support (various schools) |
| RIS➣Retail Information Systems |
| RIS➣Rail Interface System (accessory mount on guns) |
| RIS➣Review of Information Science |
| RIS➣Research Innovation Services (UK) |
| RIS➣Resonance Ionization Spectroscopy |
| RIS➣Retroreflector In Space |
| RIS➣Remote Information Service |
| RIS➣Rothberg International School (Hebrew University of Jerusalem, Israel) |
| RIS➣Redwood Inspection Service |
| RIS➣Random Interleaved Sampling |
| RIS➣Retirement Income Specialist |
| RIS➣Reparti Investigazioni Scientifiche (Italy, Carabinieri) |
| RIS➣Request for Information Services |
| RIS➣Range Instrumentation System |
| RIS➣Research Investment Strategy (Australia) |
| RIS➣Raumbezogenes Informationssystem (German: Spacereferred information systems) |
| RIS➣Rich Internet Solutions (Netherlands) |
| RIS➣Retirement and Insurance Service (a component of OPM) |
| RIS➣Radio Investigation Service |
| RIS➣Roosevelt Intermediate School (Westfield, NJ) |
| RIS➣Recreation and Intramural Sports |
| RIS➣Rannsóknagagnasafn Íslands (Icelandic: Research Bank; database) |
| RIS➣Radar Integration System |
| RIS➣Relocation Information Services |
| RIS➣Readiness Information System |
| RIS➣Ridgecrest Intermediate School |
| RIS➣Reinforced Insulated Sheath (Star Wars armor) |
| RIS➣Representative Indicator Species (US EPA) |
| RIS➣Received in Swap |
| RIS➣Robotique et Interactions (French: Robotics and Interactions; research group) |
| RIS➣Romulan Imperial Ship (Star Trek) |
| RIS➣Restricted Instructional Setting |
| RIS➣Redundant Information Sector (COMPAQ) |
| RIS➣Radar Interrogator Set (associated with joint surveillance system) |
| RIS➣Report/ing Identification Symbol |
| RIS➣Regulatory Information Specialist (US FDA) |