| Acronym | Definition |
|---|
| MRIS | Metropolitan Regional Information Systems |
| MRIS | Magnetic Resonance Imaging and Spectroscopy |
| MRIS | Medically Recommended Intensive Supervision (parole) |
| MRIS | Multi-Racial Information Systems (South Africa) |
| MRIS | Modernization Resource Information System |
| MRIS | Material Readiness Index System |
| MRIS | Microwave Reflectometer Ionization Sensor |
| MRIS | Mission Requirements Information System (Space Station) |
| MRIS | Minimum Register Instruction Sequence |
| MRIS | Mineral Rights Information System |
| MRIS | Materiel Readiness Information System |