| Acronym | Definition |
|---|
| IIRA➣International Industrial Relations Association |
| IIRA➣Illinois Institute for Rural Affairs (Western Illinois University) |
| IIRA➣Islamic International Rating Agency (credit rating) |
| IIRA➣Iron Indian Riders Association (motorcycles) |
| IIRA➣Illegal Immigration Relief Act (Hazelton, PA) |
| IIRA➣Ipertesti, Internet E Ricerca Agraria |
| IIRA➣Integrated Inertial Reference Assembly |