| Abbreviation | Definition |
|---|---|
| RIID | Resonance Ionization Imaging Detection |
| RIIE | Research Institute of Industrial Economics |
| RIIE | Research Institute of International Education |
| RIIO | Revenue Innovation Incentives Outputs |
| RIIR | Relations Industrielles Industrial Relations |
| RIJC | Rencontre Internationale des Jeunes Chercheurs |
| RIJC | Retail Integration Job Control |
| RIK | Reply In Kind |
| RIK | RikEmmett |
| RIKS | Retroactive Interactive Key Sharing |
| RIL | Radio Interface Layer |
| RIL | Read It Later |
| RIL | Recombinant Inbred Lines |
| RIL | Reeve Integral Lock |
| RIL | Relative Id Level |
| RIL | Reliance India Limited |
| RIL | Reliance Industries Limited |
| RIL | Reliance Industries Ltd |
| RIL | Res Ipsa Loquitur |
| RIL | Resolved Improve Life |