| Acronym | Definition |
|---|
| IRTA➣Institut de Recerca i Tecnologia Agroalimentàries (Institute of Agricultural-Alimentary Research and Technology) |
| IRTA➣International Reciprocal Trade Association |
| IRTA➣Intramural Research Training Award |
| IRTA➣Institute for Research and Technical Assistance |
| IRTA➣Illinois Retired Teachers Association |
| IRTA➣Irish Rider Training Association |
| IRTA➣Indiana Retired Teachers Association |
| IRTA➣International Racing Teams Association |
| IRTA➣Immigration Review Tribunal of Australia |
| IRTA➣International Retired Tugboat Association |
| IRTA➣I Read That As |
| IRTA➣In-Reactor Thimble Assembly |
| IRTA➣Industrial-Recreational Building Authority (Rhode Island) |