| QI | Qualified individual |
| QA | Quality assurance |
| QAE | Quality assurance engineer |
| QA/QC | Quality assurance/quality control |
| QC | Quality control |
| OCL | Quality Control Log |
| QCR | Quality Control Report |
| QR | Quality ranking |
| QHSE | Quality, health, safety, and environmental |
| QRA | Quantitative risk assessment |
| QOQ | Quarter on quarter |
| QL | Quicklook Log |