| Abbreviation | Definition |
|---|---|
| QEC | Quality Education Company |
| QEC | Quammen Educational Consulting |
| QEC | Quantum Engineering Corporation |
| QEC | Quebec Elite Circle |
| QEC | Questerre Energy Corp |
| QEC | Quicksilver Express Courier |
| QECIS | QuickEasyContact Internet Services |
| QED | Quality Electricals Direct |
| QED | Queen Elizabeth Distribution |
| QED | Queues Enforth Development |
| QEDC | Queens Economic Development Corporation |
| QEDI | Quantum Effect Devices Inc |
| QEE | Quinzena de Engenharia Eletrica |
| QEF | Quantum Espresso Foundation |
| QEH | Qmark Electric Heating |
| QEI | Engineers Inc |
| QEI | Quality Engineering International |
| QEI | Quantex Engineering, Inc. |
| QEI | Quantum Engineering, Inc. |
| QEK | Quality Engine Kits |