| RCEM | Rapid Compression Expansion Machine 
| Others |
| RCEM | Regional Contingency Engineering Management
| Others |
| RCEM | Regional CSO Engagement Mechanism
| Others |
| RCEM | Reproducibility in Computational and Experimental Mathematics
| Others |
| RCEM | Research Centre for Endocrinology and Metabolism
| Others |
| RCEM | Research Centre for Energy Management
| Others |
| RCEM | River Coastal and Estuarine Morphodynamics
| Others |
| RCEM | Romanian Centre for Economic Modelling
| Others |
| RCEM | Roxas Cruz Esguerra Matagay
| Others |
| RCEM | Royal College of Emergency Medicine
| Others |
| RCEM | Rubens Cunha Evangelistic Ministries
| Others |
| RCEM | Rutgers Center for Emergent Materials
| Others |