| Acronym | Definition |
|---|
| IAAA | Inflammatory Abdominal Aortic Aneurysm |
| IAAA | International Automotive Advertising Awards |
| IAAA | International Automotive Advertising Awards (est. 1995) |
| IAAA | International Association of Astronomical Artists |
| IAAA | Interscholastic Athletic Administrators Association (various locations) |
| IAAA | Illinois Agricultural Auditing Association (est. 1924) |
| IAAA | I Am An Accountant |
| IAAA | Institut für Anglistik, Amerikanistik und Anglophonie (German: Anglistic, American and Anglophone Institute) |
| IAAA | Ithaca Asian American Association (New York) |
| IAAA | I Am An AIESECer (Association for the International Exchange of Students in Economics and Commerce) |
| IAAA | Identification, Authentication, Authorisation and Accountability |
| IAAA | Idaho Agricultural Aviation Association |
| IAAA | Integrated Advanced Avionics for Aircraft |
| IAAA | Integrated Active Antenna Array |
| IAAA | International American Albino Association |
| IAAA | I Am An Attorney |
| IAAA | Integrated Advanced Avionics/Aerospace |