| Abbreviation | Definition |
|---|---|
| IT | Immediate Task |
| IT | Installation Test |
| ITA | Integrated Test Area |
| ITA | Integrated Test Article |
| ITA | International Television Academy |
| ITAP | Integrated Technical Assessment Panel |
| ITAS | Integrated Telescope Automation System |
| ITC | Igloo Thermal Control |
| ITCB | International Training Control Board |
| ITCS | Internal Thermal Control System |
| ITE | Instrumentation Test Equipment |
| ITE | Integration Test Equipment |
| ITE | Intersite Transportation Equipment |
| ITI | Inspection and Test Instruction |
| ITL | Integrate, Transfer, and Launch |
| ITM | Input Test Mass |
| ITMG | Integrated Thermal/Micrometeoroid Garment |
| ITO | Integration and Test Order |
| ITPA | Institute For Terrestrial And Planetary Atmospheres |
| ITRD | Integrated Test Requirements Document |