| Ricky Carmichael University | Academic & Science |
| Rio Cuarto | Airport Code |
| REALTORS Credit Union | Business |
| RCU | Business |
| Royal Credit Union | Business |
| Redwood Credit Union | Business |
| Radio Control Universe | Community |
| Reformed Church University | Community |
| Research Coordination Unit | Community |
| Robot Chicks Union | Community |
| Read Copy Update | Computing |
| Radio Control Unit | Computing |
| Room Control Unit | Computing |
| Remote Control Utility | Computing |
| Radio Channel Unit | Computing |
| Repository Creation Utility | Computing |
| Remote Camera Unit | General |
| Risk Control Unit | General |
| Read Capacity Units | General |
| Ready Copy Update | General |
| Rackmount Control Unit | General |
| Radar Control Unit | General |
| Rip City United | General |
| Requisition Control Unit | General |
| Recessed Commercial Unit | General |
| Rack Controller Unit | General |
| Rocket Control Unit | General |
| Rear Control Unit | General |
| Renault Classique Utilitaires | General |
| Roadside Communicator Unit | General |
| Rani Channamma University | Karnataka State University |
| Recuperative Care Unit | Medical |
| Respiratory Care Unit | Medical |
| Regular care unit | Medical |
| Rate Changes Unit | Military and Defence |
| Reserve Component Unit | Military and Defence |
| Rapid Cooling Unit | Physics Related |
| Rio Cuarto, CD, Argentina | Regional |
| Revelar Connection Utility | Softwares |
| Remote Control Unit | Telecommunication |
