| Abbreviation | Definition |
|---|---|
| IAASA | Inland Aquaculture Association of South Australia |
| IAASA | INSEAD Alumni Association South Africa |
| IAASM | International Alumni Association of Scuola Mattei |
| IAAT | Indian Association for Angiosperm Taxonomy |
| IAAT | International Association Andullation Technology |
| IAB | International Association of Bioethics |
| IAB | International Association of Bookkeepers |
| IABA | Indian American Bar Association |
| IABA | Indiana Auto Body Association |
| IABA | Indonesian Association of British Alumni |
| IABA | Inter American Bar Association |
| IABA | International Association for Biography and Autobiography |
| IABA | International Association of Black Actuaries |
| IABA | International Auto Biography Association |
| IABA | Iranian American Bar Association |
| IABA | Irish Athletic Boxing Association |
| IABA | Islamic Ahlul Bayt Association |
| IABB | International Association of Baby Boomers |
| IABBA | Inter Area Bar Billiards Association |
| IABC | International Association for Business Communicators |