| Abbreviation | Definition |
|---|---|
| IAA | Indiana Apartment Association |
| IAA | Indiana Arborist Association |
| IAA | International Accounting Association |
| IAA | International Advertising Association |
| IAA | International Anaplastology Association |
| IAA | International Association for Assyriology |
| IAA | International Association of Art |
| IAA | International Association of Astacology |
| IAA | International Astrostatistics Association |
| IAA | Investment Adviser Association |
| IAAA | Idaho Athletic Administrators Association |
| IAAA | INROADS Atlanta Alumni Association |
| IAAA | International Association of Astronomical Artists |
| IAAA | Ithaca Asian American Association |
| IAAAM | International Association for Aquatic Animal Medicine |
| IAAB | INSEAD Alumni Association Brazil |
| IAAD | Indo American Association of Delaware |
| IAAD | International Association of Aerospace Dentistry |
| IAAE | International Association Autism Europe |
| IAAE | Iowa Association of Agricultural Educators |