| Acronym | Meaning |
 | RSU | Remote ServiceUnit |
| RSVR | Reservoir |
| RSYS | ResponsibleSystem |
| RT | Range-to-Target |
| RT | Rate |
| RT | Real Time (R/T Preferred) |
| RT | Receiver-Transmitter |
| RT | ReferenceTrajectory |
| RT | Right |
| RTA | Real-Time Accumulator |
| RTAC | Research And Technology Advisory Committee |
| RTB | Resistance Temperature Bulb |
| RTC | Real-Time Clock |
| RTC | Real-Time Command |
| RTC | Real-time Command |
| RTC | Real-Time Computer |
| RTC | Room Temperature Cure |
| RTCC | Real-Time Command Controller |
| RTCC | Real-Time Computer Center (NASA) |
| RTCC | Real-Time Computer Command (UPlink) |
| RTCC | Real-Time Computer Complex |
| RTCE | Rotation/Translation Control Electronics |
| RTCL | Reticle |
| RTCP | Real-Time Communications Processor |
| RTCS | Real-Time Computer System |
| RTD | Rate Damping |
| RTD | Real-Time Display |
| RTD | Resistance Temperature Device |
| RTE | Responsible Test Engineer |
| RTG | Radi0isotope Thermal Generation |
| RTG | Radioisotope Thermoelectric Generator |
| RTG | Radioisotope Thermoelectric Generator |
| RTG | Range (Slant) To Ground |
| RTHC | Rotation-Translation Hand Controller |
| RTHS | Real-Time Hybrid System |
| RTIF | Real-Time Interface |
| RTLS | Return To Launch Site |
| RTLS | Return To Launch Site |
| RTN | Return |
| RTO | Responsible Test Organization |
| RTOP | Research And Technology Objectives And Plans |
| RTR | Rotor |
| RTS | Real-Time Supply |
| RTS | Remote Tracking Station |
| RTSF | Real-Time Simulation Facility |
| RTTV | Real-Time Television |
| RTU | Renote Terminal Unit |
| RTV | Room-Temperature Vulcanized |
| RTV | Room-temperature Vulcanizing |
| RU | Remote Unit |
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