| Abbreviation | Definition |
|---|---|
| RTG | Radioisotope Thermal Generator |
| RTG | Radioisotope Thermoelectric Generator |
| RTG | Slant Range To Ground |
| RTHC | Rotation-Translation Hand Controller |
| RTHS | Real-Time Hybrid System |
| RTIF | Real-Time InterFace |
| RTLS | Return To Launch Site |
| RTM | Remote Telemetry Module |
| RTO | Regenerative Thermal Oxidizer |
| RTO | Responsible Test Organization |
| RTOP | Research and Technology Objectives and Plans |
| RTR | Real-Time Ring |
| RTR | Rotor |
| RTS | Real Time System |
| RTS | Real-Time Supply |
| RTS | Remote Tracking Station |
| RTSF | Real-Time Simulation Facility |
| RTTM | Return To The Moon |
| RTTV | Real-Time Television |
| RTU | Remote Telemetry Unit |