| Abbreviation | Definition |
|---|---|
| QDI | Quality Dining INC |
| QDI | Quality Dining, Inc. |
| QDI | Quality Distribution Inc |
| QDI | Quality Distribution, Inc. |
| QDI | Quantum Devices, Inc. |
| QDI | Quantum Dynamics International, Inc. |
| QDI | Questioned Document Investigations, Ltd. |
| QDJ | Quantum Design Japan |
| QDJ | Quinta Don Jose Bed & Breakfast Hotel, Guadalajara Metropolitan Area, Jalisco, Mexico |
| QDK | Quarterdeck |
| QDL | Quantitative Diagnostic Laboratories |
| QDN | Quality Distribution Network |
| QDO | QualityData ONLINE |
| QDOT | Quantum Dot Corporation |
| QDP | Quality Dairy Plastics |
| QDS | Quality Data Systems |
| QDSI | Quiescence Diving Services , Inc. |
| QDT | Quality Diecast Toys |
| QEA | Quality Engineering Associates, Inc. |
| QEC | Qualified Entertainment Company |