| Abbreviation | Definition |
|---|---|
| RID | Reaction Injection Molded |
| RID | Review Item Disposition |
| RIDI | Receiving Inspection Detail Instruction |
| RIE | Right Inboard Elevon |
| RIF | Relative Importance Factor |
| RIG | Rate Integration Gyroscope |
| RIGI | Receiving Inspection General Instruction |
| RIL | Recoverable Item(s) List(s) |
| RIL | Repairable Item List |
| RIL | Reparable Item List |
| RIM | Reaction Injection Molded |
| RIMS | Retarding Ion Mass Spectrometer |
| RIP | Remedy In Place |
| RIPS | Radar Impact Prediction System |
| RIPS | Runway Incursion Prevention System |
| RIR | Reportable Item Report |
| RIS | Reporting Identification Symbols |
| RIS | Research Information System |
| RISA | Rapid Imaging Spectrophotometric Array |
| RISKAC | Risk Acceptance |