| Abbreviation | Definition |
|---|---|
| QUAD | Quandrangle, Quadrant, Quadrature |
| QUADS | Quality Achievement Data System |
| QUAL | Qualification, Qualified |
| QUAL | Quality |
| QUAT | Quaternion |
| QUEST | Quality Underpins Every Single Thing |
| QUI | Quito, Ecuador, Spaceflight Tracking Data Network station |
| QUIC | Quality Data Information and Control |
| QUP | Quality Unit Pack |
| QVJ | Quality Verification Journal |
| QVP | Quality Verification Program |
| QVT | Qualified Verification Testing |
| QVVT | Qualified Verification Vibration Testing |
| QXI | Quantitative X-ray Imager |
| R | Radius |
| R | Range Rate |
| R | Rankine |
| R | Ratio |
| R | Rear |
| R | Receive |