| RETC | Rapid Excavation and Tunneling Conference 
| Others |
| RETC | Rapid Excavation Tunneling Conference
| Others |
| RETC | Real Estate Technology Connection
| Others |
| RETC | Real Estate Training Center
| Others |
| RETC | Regional Educational Technology Center
| Others |
| RETC | Regional Educational Treatment Center
| Others |
| RETC | Regional Emergency Training Center
| Others |
| RETC | Registro de Emisiones y Transferencia de Contaminantes
| Others |
| RETC | Renewable Energy Test Center
| Others |
| RETC | Renewable Energy Testing Center
| Others |
| RETC | Renewable Energy Training Center
| Others |
| RETC | Reptile Education Through Contact
| Others |
| RETC | Research Education and Training Center
| Others |
| RETC | Research Ethics Training Curriculum
| Others |
| RETC | Reserve Enlisted Training Corp
| Others |
| RETC | Reserve Enlisted Training Corps
| Others |
| RETC | Residential Energy Tax Credit
| Others |
| RETC | Revolution Express Track Club
| Others |
| RETC | Romeo Engineering and Technology Center
| Others |