| RCMS | Ilan, Taiwan 
| Others |
| RCMS | Rachel Carson Middle School
| Others |
| RCMS | Radio Colony Model School
| Others |
| RCMS | Radiology Curriculum Management System
| Others |
| RCMS | Ralph Chandler Middle School
| Others |
| RCMS | Rancho Cucamonga Middle School
| Others |
| RCMS | Randolph Community Middle School
| Others |
| RCMS | Rastriya Colliery Majdoor Sangh
| Others |
| RCMS | Raymond Cree Middle School
| Others |
| RCMS | Recharge Card Management System
| Others |
| RCMS | Redwood Coast Medical Services
| Others |
| RCMS | Reed Custer Middle School
| Others |
| RCMS | Reedy Creek Middle School
| Others |
| RCMS | Regional Center for Math and Science
| Others |
| RCMS | Reliable and Consistent Message Streaming
| Others |
| RCMS | Remote Change Management Server
| Others |
| RCMS | Remote Cryptographic Management System
| Others |
| RCMS | Rensselaer Central Middle School
| Others |
| RCMS | Research Center for Modeling and Simulation
| Others |
| RCMS | Research Centre for Modeling and Simulation
| Others |
| RCMS | Reservation and Computer Management System
| Others |
| RCMS | Responsible Care Management System
| Others |
| RCMS | Rethinking Container Management System
| Others |
| RCMS | Richland County Middle School
| Others |
| RCMS | Richmond County Medical Society
| Others |
| RCMS | Ridgecrest Chamber Music Society
| Others |
| RCMS | Rim Country Middle School
| Others |
| RCMS | Roberto Clemente Middle School
| Others |
| RCMS | Roberts Community Music School
| Others |
| RCMS | Rock Creek Middle School
| Others |
| RCMS | Rockcastle County Middle School
| Others |
| RCMS | Rosemary Clarke Middle School
| Others |
| RCMS | Rowan County Middle School
| Others |
| RCMS | Royal Canadian Medical Service
| Others |
| RCMS | Russell County Middle School
| Others |