| RSEC | Radiation Science and Engineering Center
| Others |
| RSEC | Recording Standards and Ethics Committee
| Others |
| RSEC | Red Sea Environmental Center
| Others |
| RSEC | Red Sea Environmental Centre
| Others |
| RSEC | Regional Services and Education Center
| Others |
| RSEC | Regional Services Education Center
| Others |
| RSEC | Regional Special Events Center
| Others |
| RSEC | Regulatory Science and Engineering Center
| Others |
| RSEC | Research on Social and Educational Change
| Others |
| RSEC | Retirement Savings Education Campaign
| Others |
| RSEC | Rising Sun Energy Center
| Others |