| Acronym | Meaning |
 | RFL | Reflect |
| RFO | Request For Order |
| RFP | Request For Proposal |
| RFP | Requirements And Formulation Phase |
| RFPA | Request For Proposal Authorization |
| RFQ | Request For Quotation |
| RFT | Ready For Training |
| RFW | Request For Waiver (Deviation) |
| RG | Radio Guide |
| RG | Rate Gyro |
| RGA | Rate Gyro Assembly |
| RGA | Rate Gyro Assembly |
| RGAL | Rate Gyro Assembly-Left SRB |
| RGAO | Rate Gyro Assembly-Orbiter |
| RGAR | Rate Gyro Assembly-Right SRB |
| RGM | Redundant Gyro Monitor |
| RGP | Rate Gyro Package |
| RGRMA | Rate Gyro Redundancy Management Algorithm |
| RH | Relative Humidity |
| RH | Right Hand |
| RHC | Right Hand Circular |
| RHC | Rotation Hand Controller |
| RHC | Rotational Hand Controller |
| RHCM | Relative Humidity Control/Monitor |
| RHCP | Right Hand Circular Polarization (Polarized) |
| RHEB | Right Hand Equipment Bay |
| RHEO | Rheostat |
| RHFEB | Right Hand Forward EquiPment Bay |
| RHL | Residual Hazards List |
| RHM | Relative Humidity Monitor |
| RHP | Right Hand Panel |
| RHS | Right Hand Side |
| RHS | Rocketdyne Hybrid Simulator |
| RHSC | Right Hand Side Console |
| RHT | Radiant Heat Temperature |
| RHU | Radioisotope Heater Unit |
| RHW | Router Header Word |
| RI | Rockwell International |
| RIB | Recoverable Item Breakdown |
| RIB | Right Inboard |
| RIC | Resistance Inductance And Capacitance |
| RIC | Rockwell International Corporation |
| RICC | Remote Intercomputer Communications Interface |
| RID | Review Item DisPosition |
| RIDI | Receiving Inspection Detail Instruction |
| RIE | Right Inboard Elevon |
| RIF | Relative Importance Factor |
| RIG | Rate Integration Gyro |
| RIGI | Receiving Inspection General Instruction |
| RIL | Recoverable Item(s) List(s) |
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