| Acronym | Meaning |
 | QLS | Quick Look Station |
| QM | Qualification Motor |
| QPL | Qualified Parts List |
| QPL | Qualified Products List |
| QPR | Quarterly Progress Report |
| QPRD | Quality Planning Requirements Document |
| QPS | Quality Planning Specification |
| QPS | Quantity Planning Specification |
| QPSK | Quadrature Phase Shift Key |
| QRE | Quick-Reaction Estimate |
| QRI | Quick-Reaction Integration |
| QRIA | Quick-Reaction Integration Activity |
| QRS | Quick-Reaction Sortie |
| QRSL | Quick-Reaction Space Laboratory |
| QSA | Qualification Site Approval |
| QSGVT | Quarter Scale Ground Vibration Test |
| QSL | Qualified Source List |
| QSM | Quarter Scale Model |
| QSMVT | Quarter Scale Model Vibration Testing |
| QSS | Quindar Scanning System |
| QT | Qualification Test |
| QTP | Qualification Test Plan |
| QTR | Qualification Test Report |
| QTR | Quarter |
| QTRS | Quarters |
| QUAD | Quandrangle |
| QUADS | QualitY Achievement Data SYstem |
| QUAL | Qualification |
| QUAL | Quality |
| QUAT | Quaternion |
| QUIC | Quality Data Information And Control |
| QUP | Quality Unit Pack |
| QVT | Qualified Verification Testing |
| QVVT | Qualified Verification Vibration Testing |
| R | Gas Constant |
| R | Radius |
| R | Range |
| R | Range Rate |
| R | Rankine |
| R | Ratio |
| R | Rear |
| R | Receive |
| R | Redundant |
| R | Regulate |
| R | Rehydratable |
| R | Reliability |
| R | Replace |
| R | Resistance |
| R | Right |
| R | Roentgen |
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