| RIS | Insurance Services 
| Others |
| RIS | Radboud International Students
| Others |
| RIS | Radeon Image Sharpening
| Others |
| RIS | Radiation Induced Signal
| Others |
| RIS | Radical Isolation Suit
| Others |
| RIS | Radio Information Service
| Others |
| RIS | Radiological Information System
| Others |
| RIS | Radiologically Isolated Syndrome
| Others |
| RIS | Radiology and Imaging Specialists
| Others |
| RIS | Radiology Information System
| Others |
| RIS | Radiology Information Systems
| Others |
| RIS | Raggruppamento Investigazioni Scientifiche
| Others |
| RIS | Rail Integration System
| Others |
| RIS | Rail Interface System
| Others |
| RIS | Rainbow International School
| Others |
| RIS | Raster Image Set
| Others |
| RIS | Really Insane Search
| Others |
| RIS | Reconnaissance Information System
| Others |
| RIS | Recoverable in-Doubt Structure
| Others |
| RIS | Recreation and Intramural Sports
| Others |
| RIS | Reduced Instruction Set
| Others |
| RIS | Regional Innovation And Strategy
| Others |
| RIS | Regional Innovation Strategies
| Others |
| RIS | Regional Innovation Strategy
| Others |
| RIS | Regional Investment Strategy
| Others |
| RIS | Registration Information Sheet
| Others |
| RIS | Regulation Impact Statement
| Others |
| RIS | Regulation Information System
| Others |
| RIS | Regulatory Impact Statement
| Others |
| RIS | Regulatory Information Specialist
| Others |
| RIS | Regulatory Issue Summary
| Others |
| RIS | Reliable Internet Systems
| Others |
| RIS | Relocation Information Services
| Others |
| RIS | Remote Install Services
| Others |
| RIS | Remote Installation Server
| Others |
| RIS | Remote Installation Service
| Others |
| RIS | Remote Installation Services
| Others |
| RIS | Reparatur Informations System
| Others |
| RIS | Reporting Identification Symbols
| Others |
| RIS | Reprographic Imaging Services
| Others |
| RIS | Republik Indonesia Serikat
| Others |
| RIS | Reputation Integrity Service
| Others |
| RIS | Research and Instructional Support
| Others |
| RIS | Research Information System
| Others |
| RIS | Research Information Systems
| Others |
| RIS | Research Interest Sections
| Others |
| RIS | Researchers in Schools
| Others |
| RIS | Reservoir Induced Seismicity
| Others |
| RIS | Resin Impregnated Synthetic
| Others |
| RIS | Resistance, Immunity, Susceptibility
| Others |
| RIS | Restoratative Integral Support
| Others |
| RIS | Retail Improvement Specialist
| Others |
| RIS | Retail Information System
| Others |
| RIS | Retail Information Systems
| Others |
| RIS | Retail Inkjet Solutions
| Others |
| RIS | Retirement and Insurance Solutions
| Others |
| RIS | Retirement Income Specialist
| Others |
| RIS | Retirement Income Stabilizer
| Others |
| RIS | Retroviral Immunology Section
| Others |
| RIS | Reverse Image Search
| Others |
| RIS | Reviving the Islamic Spirit
| Others |
| RIS | Ridgecrest Intermediate School
| Others |
| RIS | Rishiri, Japan
| Others |
| RIS | River Information Services
| Others |
| RIS | Road Information System
| Others |
| RIS | Roadway Inventory System
| Others |
| RIS | Robotics Invention System
| Others |
| RIS | Rotational Isomeric State
| Others |
| RIS | Routing Information Service
| Others |
| RIS | Ruamrudee International School
| Others |
| RIS | Russian Imperial Stout
| Others |