| Rensselaer Computing System | Academic & Science |
| Recombinant Congenic Species | Academic & Science |
| Research Collaboration System | Academic & Science |
| Resilient Composite System | Academic & Science |
| Rockbridge Choral Society | Academic & Science |
| Rural Clinical School | Academic & Science |
| ReAgent Chemical Services | Academic & Science |
| Rochester | Airport Code |
| Reconstruction Companies | Banking |
| Registar of Co-operative Societies | Banking |
| Random Capitalization Syndrome | Banking |
| RCM Strategic Global Government Fund, Incorporated | Business |
| Ryan Computer Services | Business |
| Residence and Catering Services | Business |
| Roof Consulting Services, Inc. | Business |
| Real Communication Solutions | Business |
| The Royal College of Surgeons of England | Business |
| Real Company Stuff | Business |
| Retail Credit Solutions | Business |
| Ross Career Services | Business |
| Reactive Chemical Species | Chemistry |
| Reading, Consultation, and Study | Community |
| Residential Classification Scale | Community |
| Residential Classification Scheme | Community |
| Rockford Christian School | Community |
| Red Crescent Society | Community |
| Radcliffe Choral Society | Community |
| Red Crescent Societies | Community |
| Rochester Catholic Schools | Community |
| Russellville City Schools | Community |
| Rockingham County Schools | Community |
| Roxboro Community School | Community |
| Retirement Community Specialists | Community |
| Radio Conference Subcommittee | Community |
| Richmond Community Schools | Community |
| Redwood Christian Schools | Community |
| Rochester Community Schools | Community |
| Roanoke County Schools | Community |
| Rutherford County Schools | Community |
| Religious Community Services | Community |
| Rantoul City Schools | Community |
| Reloadable Control Storage | Computing |
| Radio Communications System | Computing |
| Remote Computer System | Computing |
| Revision Control Software | Computing |
| Record Size | Computing |
| Realtime Control Systems | Computing |
| Remote Console | Computing |
| Rate Control Scheme | Computing |
| Return Channel System | Computing |
| Resource Construction Set | Computing |
| Reference Color Space | Computing |
| Remote Computing Service | Computing |
| Rochester Computer Society | Computing |
| Raytheon Cyber Services | Computing |
| Roller Coaster Syndrome | Computing |
| Roll Control Suspension | General |
| Robust Cargo Suspension | General |
| Ride Control System | General |
| Realtime Control System | General |
| Runflat Component System | General |
| Radial Clutch Master Cylinder | General |
| Ratio Click System | General |
| Retro Classics Stuttgart | General |
| Ride Control Suspension | General |
| Racing Clutch System | General |
| Radio Cross Section | General |
| Road Calibration Suspension | General |
| Rain City Subies | General |
| River Cities Speedway | General |
| Riverfront Camaro Show | General |
| Rear Coil Spring | General |
| Roadster Club Scandinavia | General |
| Race Car Show | General |
| Red Cedar Speedway | General |
| Reduction Catalytique Selective | General |
| Really Crappy Support | General |
| Red Cherry Shrimp | General |
| Report Control Symbol | General |
| Rich Communication Services | General |
| Remote Control System | General |
| Ravena Coeymans Selkirk | General |
| Representative Child Sponsorship | General |
| Records Control Schedules | General |
| Rich Communications Services | General |
| Requirements Computation System | General |
| Reasonable Cleaning Services | General |
| Rack Correction System | General |
| Refrigerated Construction Service | General |
| Renaissance Cooking Systems | General |
| Ray Cammack Shows | General |
| Rich Communication Suite | General |
| Rapid Convenience Surveys | General |
| Rich Communications Suite | General |
| Recovery Control System | General |
| Rich Communication Service | General |
| Really Contrived Story | Governmental |
| Records Control Schedule | Governmental |
| Regulations Coordination Staff | Governmental |
| Retirement Confidence Survey | Governmental |
| Replacement Cost Study | Governmental |
| Revision Control System | Information Technology |
| Relational Calculus Subset | Maths |
| Relative Configuration Space | Maths |
| Respiratory Care Services | Medical |
| READ classification system Informatics | Medical |
| Red Cell Suspension | Medical |
| Repeat Caesarean Section | Medical |
| Registered Cardiac Sonographer | Medical |
| Reticulum Cell Sarcoma | Medical |
| Royal College of Surgeons | Medical |
| Respirable Crystalline Silica | Medical |
| Radar Cross Section | Military and Defence |
| Rudder Control System | Military and Defence |
| Regimental Combat Support | Military and Defence |
| Remote Cache Server | Networking |
| Resource Control System | Networking |
| Real Compton Scattering | Physics Related |
| Repubblica Comunista Salzese | Regional |
| Rpg Creation System | Softwares |
| Reaction Control System | Space Science |
| Radio Cluster Server | Telecommunication |
| Real Communication Solution | Telecommunication |
