| Abbreviation | Definition |
|---|---|
| RIIO | Revenues Incentives Innovation Outputs |
| RIJ | Rolling In Junk |
| RIJI | Restoring International Justice Imports |
| RIL | Reliance Industries Ltd |
| RIL | Reliance Industries, LTD |
| RIL | Reliance Infrastructure Ltd |
| RIM | Registered International Movers |
| RIM | Reliance India Mobile |
| RIM | Research In Motion |
| RINL | Rashtriya Ispat Nigam Ltd |
| RIOC | Roosevelt Island Operating Corporation |
| RIRDC | Rural Industries Research and Development Corporation |
| RIRL | Ruttonsha International Rectifier Ltd |
| RIS | Radiology Information Systems |
| RIS | Reliable Internet Systems |
| RIS | Reprographic Imaging Services |
| RISC | Recovery Industry Services Company |
| RISI | Resource Information Systems Inc |
| RISI | Rural Innovation Strategies Inc |
| RITA | Rowan Individual Transportation Assistance |