| Research Ideas and Outcomes | Academic & Science |
| Remote Instant Office | Business |
| Research Instruction Online | Business |
| Really Innovative Original | Business |
| Reporting Information Online | Business |
| Reverse Implement Option | Business |
| Rigorous In Operations | Business |
| Real Investment Opportunities | Business |
| Red Iron Oxide | Chemistry |
| Radio Information Officer | Community |
| Reviewers International Organization | Community |
| Ram (random Access Memory) Input/ Output | Computer Hardware |
| Riada Internet Objects | Computing |
| Radx Input Output | Computing |
| Resources Input Optimization | Computing |
| Ram Input Output | Computing |
| Reference Identifier Object | Computing |
| Reusable Information Object | Computing |
| Random Access Memory Input Output | Computing |
| Reference Interconnection Offer | Computing |
| Realio Network | Cryptocurrency |
| Remote Input Output | Electronics |
| Ressoruces Input Optimisation | General |
| Restore Iraqi Oil | General |
| Review International Organization | General |
| Re Integration Of Offenders | General |
| Rdf I O | General |
| Radar Intelligence Officer | General |
| Readiness Input And Output | General |
| Relation Inherited Object | General |
| Robot Item Organizer | General |
| Recognition Insight and Openness | General |
| Right Inferior Oblique | General |
| Resolution Independent Object | General |
| Reference Information Object | General |
| reconfigurable I O | General |
| Rangiora International Office | General |
| Really Interesting Objects | General |
| Restoration International Outreach | General |
| Realtime Input Output | General |
| Rowing the Indian Ocean | General |
| Relational Intentional Overflow | General |
| Re Integrating Offenders | General |
| Reconfigurable Input Output | General |
| Reliable Innovative and Outstanding | General |
| Road Intersection Optimization | General |
| Radio Intercept Officer | General |
| Rapid Information Organiser | General |
| Rigor in Operations | General |
| Rigour In Operations | General |
| Recognition Insight Openness | General |
| Reflective Interpolated Optical | General |
| Ride It Out | Governmental |
| Rail Incident Officer | Governmental |
| Regional Inspection Officer | Jobs |
| Radar Intercept Officer | Jobs |
| Remote Infrastructure Operation | Networking |
| Rio De Janeiro International Airport, Rio De Janeiro, Rio de Janeiro, Brazil | Regional |
| Rock In Opposition | Regional |
| Revive International Olympic | Sports |
