| Research on Adaptation to Climate Change | Academic & Science |
| Reading Area Community College | Academic & Science |
| Registered Apprenticeship College Consortium | Academic & Science |
| Risk Adjusted Cost of Capital | Business |
| Research Administrators Certification Council | Business |
| Radiology Administration Certification Commission | Business |
| Radio Advertising Clearance Centre | Business |
| Red Arrow Coal Company | Business |
| Resistance Against Claw Club | Community |
| Redmond Arts and Culture Commission | Community |
| Redwood Area Community Center | Community |
| Rome Art and Community Center | Community |
| Richmond Adult Community College | Community |
| Redmond Arts Culture Commission | Community |
| Recreation And Convocation Center | Community |
| Republican Assembly Campaign Committee | Computing |
| Rally Catalunya Costa Daurada | General |
| Real Automobil Club de Catalunya | General |
| Royal Automobil Club Catalunya | General |
| Range Adaptive Cruise Control | General |
| Rally Catalunya Clasicos | General |
| Radar Active Cruise Control | General |
| Rape and Abuse Crisis Center | General |
| Richmond Animal Care and Control | General |
| Reference Amounts Customarily Consumed | General |
| Reference Amount Customarily Consumed | Governmental |
| Rockbridge Area Conservation Council | Governmental |
| Regional Arts Culture Council | Governmental |
| Regional Arts and Culture Council | Governmental |
| Romanian American Chamber of Commerce | Governmental |
| rostral Anterior Cingulate Cortex | Medical |
| Racers Against Childhood Cancer | Medical |
| Regional Admission Counselors of California | Regional |
| Ride Around Clark County | Regional |
| Rhema Australian Consulting Company | Regional |
| Royal Albert Cycling Club | Sports |