| QA | Quality assurance |
| QA/QC | Quality assurance/quality control |
| QBS | Quality-based selection |
| QC | Quality control |
| QDF | Queensland Dept. of Forestry |
| QDM | Queensland Dept. of Mines |
| Q.H. | Quadruple hydrant |
| QINSy | Quality Integrated Navigation System (Quality Positioning Services, Inc.) |
| QLID | Queensland Land Information Directory |
| QLIS | Queensland Land Information Strategy |
| QLPS | Quick-Look Processing System |
| qm | Quadratmeter |
| QMSoft | Qualitative Marketing Software Inc. |
| QS | Quadratic splines |
| QSL | Quarter scan line |
| QTM | Quaternary triangular mesh |
| QW | Quality of water |