RIIS
| Acronym | Definition |
|---|---|
| RIIS | Research Institute for Internet Strategies (Japan) |
| RIIS | Research Institute for Innovation and Sustainability (South Africa) |
| RIIS | Research into Internet Systems (Southfield, MI) |
| RIIS | Range Integrated Instrumentation System |
| RIIS | Research Institute of Industrial Safety (Japan) |
| RIIS | Route Integration Instrumentation System |
| RIIS | Radiology Intelligent Information System (Nagoya University Hospital; Nagoya, Aichi, Japan) |
| RIIS | Radiographic Image Interpretation System (radiology) |