| Acronym | Definition |
|---|
| IRBA | Independent Regulatory Board for Auditors (South Africa) |
| IRBA | Internal Ratings Based Approach |
| IRBA | International Reptile Breeders Association |
| IRBA | Isle Royale Boaters Association (Houghton, MI) |
| IRBA | Institut de Recherche Biomédicale des Armées (French: Institute for Military Biomedical Research) |
| IRBA | Illinois Road Builders Association |
| IRBA | Infrastructure for Regional Banking Activity (Japanese company) |
| IRBA | Infrastructure for Regional Banking Activity (Tokyo, Japam) |
| IRBA | International Rose Breeders Association |