| Acronym | Meaning |
 | RIL | Repairable Item List |
| RIL | Reparableltemlist |
| RIPS | Radar Impact Prediction System |
| RIR | Reportable Item Report |
| RIS | Reporting Identification Symbols |
| RISKAC | Risk Acceptance |
| RIT | Request For Interface Tool |
| RIU | Remote Interface Unit |
| RIV | Recirculation Isolation Valve |
| RJ/EC | Reaction Jet/Engine Control |
| RJC | Reaction Jet Control |
| RJD | Reaction Jet Device |
| RJD | Reaction Jet Driver |
| RJD | Reaction Jet Driver |
| RJDA | Reaction Jet Driver Aft |
| RJDF | Reaction Jet Driver Forward |
| RJEC | Reaction Jet Engine Control |
| RJOD | Reaction Jet OMS Driver |
| RK | Recharge |
| RL | Return Link |
| RLA | Repair Level Analysis |
| RLA | Repair Line Agreement |
| RLC | Remote Load Controller |
| RLF | Relief |
| RLG | Ring Laser Gyro |
| RLT | Return Line Tether |
| RLY | Relay |
| RM | Redundancy Management |
| RM | Redundancy Management |
| RM | Reference Mission |
| RM | RemoteManipulator |
| RM | Rendezvous Maneuver |
| RM | Rescue Module |
| RM | Right Mid |
| RM/MS&C | Redundancy Management/Moding |
| RM/MS&C | Control |
| RMA | Renote Manipulator Arm |
| RMC | Redundancy Management Control |
| RMF | RCS Module Forward |
| RMG | Right Main Gear |
| RMI | Radio Magnetic Indicator |
| RMRS | Repeatable Maintenance And Recall System |
| RMS | Radian Means Per Second |
| RMS | Random Motion Simulator |
| RMS | Redundancy Management System |
| RMS | Remote Manipulator System |
| RMS | Remote ManiPulator System (SubsYstem) |
| RMS | Root Mean Square |
| RMS | Root-Mean-Square |
| RMSVP | Remote ManiPulator SubsYstem Verification Plan |
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