| Acronym | Definition |
|---|
| IATR➣International Association of Tamil Research |
| IATR➣Ice Age National Scenic Trail (US National Park Service) |
| IATR➣International Association of Transportation Regulators |
| IATR➣Is Amended To Read |
| IATR➣Israeli Association for Theatre Research |
| IATR➣Iowa Traction Railroad Co. |