| Acronym | Definition |
|---|
| IRTI➣Innovative Rehabilitation Technology, Inc. (est. 1979) |
| IRTI➣Islamic Research and Training Institute |
| IRTI➣Infrared Thermal Imaging |
| IRTI➣International Reformed Theological Institute (Amsterdam, Netherlands) |
| IRTI➣Instytut Rozwoju Technologii Informatycznych (Polish: Institute for the Development of Information Technology) |
| IRTI➣Integrated Resource Technologies, Inc. (Alexandria, VA) |
| IRTI➣Idaho Recreation and Tourism Initiative |
| IRTI➣Immigration Reform Transformation Initiative |