| Acronym | Meaning |
 | QPMDA | Quasiparticle Mean Density Approxn. (assocd. With Local-d. Theory) |
| QPO | Quasi-periodic Oscillation |
| QPT | Quantum Phase Transition |
| QPT | Quasiparticle Tunneling |
| QR-MWH | Quasi-relativistic Mulliken-Wolfsberg-Helmholz Method |
| QRA | Quantitative Risk Assessment |
| QRAR | Quantitative Retention-activity Relationship |
| QRF | Quadratic Response Function (a Quantum Propagator) |
| QRHF-CC | Quasirestricted Hartree-Fock Coupled Cluster |
| QRIOSA | Quantum Reactive Infinite Order Sudden Approxn. |
| QRM | Quadratic Rubinow Method (variational Method For Scattering) |
| QRPA | Quadratic Random Phase Approxn. |
| QSAR | Quantitative Structure-activity Relationship(s) |
| QSBR | Quant. Structure-biodegrdn. Relationships |
| QSERR | Quantitative Structure-enantioselective Retention Relationships |
| QSEX | Quadrature Selective Excitation |
| QSI | Quantum Statistical Interference |
| QSM | Quantum Shell Model |
| QSM | Quantum Statistical Mechanics |
| QSM | Quantum-statistical Model |
| QSMD | Quantum-stochastic Mol. Dynamics |
| QSMR | Quantitative Structure-metabolism Relationship |
| QSO | Quasistellar Objects |
| QSPR | Quantitative Structure Property Relationship |
| QSR | Quality Status Report (of North Sea Task Force) |
| QSRR | Quantitative Structure-retention Relationships |
| QSSA | Quasi-steady-state Approximation |
| QSSPC | Quasi-steady-state Photoconductance |
| QSTLS | Quantum Singwi-tosi-land-sjolander (theory |
| QTCS | Quantum Theorem Of Corresponding States |
| QTL | Quantitative Trait Loci |
| QTM | Quick-turnaround Method |
| QTOF | Quadrupole Time-of-flight |
| QTPT | Quantum Thermodynamic Perturbation Theory |
| QTST | Quantum Transition State Theory |
| QUAL2E | Enhanced Stream Water Quality Model |
| QUAPI | Quasiadiabatic Propagator Path Integral Method |
| QUASAR | Quality Simulation Along Rivers (environmental Model) |
| QUASH | Quality Assurance Of Sample Handling [a EU Project] |
| QUASIMEME | Quality Assurance Of Information For Marine Environmental Monitoring In Europe |
| QUAX | Quantitative Phase-Analysis With X-ray Powder Diffraction |
| QUE | Quantized Universal Enveloping (algebras In Mol. Vibrational Spectra Calcns.) |
| QUPID | Quantum Path Integral (mol.) Dynamics (method In Mol. Calcns.) |
| QVB | Quasiempirical Valence Bond (method) |
| QVE | Quasivibrational Energy (formalism In Multiphoton Dissocn.) |
| QWASI | Quantitative Water Air Sediment Interaction |
| QWIP | Quantum Well IR Photodetector |
| QWR | Quantum Wire |
| QXRD | Quantitative X-ray Diffraction |
| R&D | Research And Development |
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