| QEI | Qualified Elevator Inspector (NAESA) | 合格电梯检查员（NAESA） |
| QEI | Quod Erat Inveniendum (Latin: Which Was to Be Found Out) | Quod Erat Inveniendum（拉丁语：有待发现） |
| QEI | Queen Elizabeth Islands | 伊丽莎白女王群岛 |
| QEI | Queen Elizabeth I | 伊丽莎白女王一世 |
| QEI | Quod Erat Inveniendum | 引用Erat Inveniendum |
| QEI | Quality Engineering International | 国际质量工程 |
| QEI | Quantex Engineering, Inc. | Quantex工程公司。 |
| QEI | Quantum Engineering, Inc. | 量子工程公司。 |