| QTI | QT Interval (represents the time for electrical activation and inactivation of the ventricles; letters designate differe | QT间期（表示心室电激活和失活的时间；字母表示不同 |
| QTI | Quad/Tech International | 四/科技国际 |
| QTI | Quick Tributary Infill | 快速支路填充 |
| QTI | Quick Technologies, Inc. | Quick Technologies公司。 |
| QTI | Quality Thermistor, Inc. | Quality Thermistor公司。 |
| QTI | Quantitative Technologies, Inc. | 定量技术公司。 |
| QTI | What is your true track? | 你的真实轨迹是什么？ |
| QTI | Question and Test Interoperability | 提问与测试互操作 |
| QTI | Qualified Target Industry | 合格目标行业 |
| QTI | Quantum Theory of Immortality | 不朽的量子理论 |
| QTI | True Track or Course (radiotelegraphy) | 真实航迹或航向（无线电报） |
| QTI | Questions And Test Interoperability | 问题和测试互操作性 |
| QTI | Quapaw Technical Institute | Quapaw技术学院 |