| Rare Awareness Research and Education | Academic & Science |
| Radford Amazon Research Expedition | Academic & Science |
| Retinoic Acid Response Element | Academic & Science |
| Ronne Antarctic Research Expedition | Academic & Science |
| Rooted And Reaching Everywhere | Academic & Science |
| Rapidly Accelerated Research Experience | Academic & Science |
| Rare Hospitality International, Inc. | Business |
| Ropemarks Artistic Rope Exchange | Business |
| Rapid Assessment Research Evaluation | Business |
| Raleigh Area Real Estate | Business |
| Reinhold Associates Real Estate | Business |
| Revolutionary Artistic Relevant Enchanting | Community |
| Responsible And Respectful Everyday | Community |
| Refocus, Action, Results, and Exceed | Community |
| Real Audio Renderer | Computing |
| SuperRare | Cryptocurrency |
| Real Authentic Real Etiquette | General |
| Risk Adjusted Returns On Equity | General |
| Reducing Avoidable Readmissions Effectively | General |
| Romance Author and Reader Events | General |
| Reflect Act Reinforce Evaluate | General |
| Reptile Adoption Rehabilitation and Education | General |
| Rhythm And Rappin Eternally | General |
| Roadless Area Review And Evaluation | General |
| Rapid Assessment Response And E | General |
| Resource Assistance for Rural Environments | General |
| Responsible Accountable Relevant and Ethical | General |
| Repeatable Adaptable Reliable Extensible | General |
| συνδεδεένα δίκτυα για την ευρωπαϊκή έρευνα | International |
| Reseaux Associes pour la Recherche Europeenne | International |
| Rare Animal Relief Effort | Medical |
| Rapid Assessment Response And Evaluation | Medical |
