| 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) |