| Acronym | Definition |
|---|
| IAA | Internationale Automobil-Ausstellung (German automobile show) |
| IAA | International Advertising Association |
| IAA | Israel Antiquities Authority |
| IAA | Insurance Auto Auctions |
| IAA | International Actuarial Association (Ottawa, Ontario, Canada) |
| IAA | International Academy of Astronautics (Paris, France) |
| IAA | Instituto de Astrofisica de Andalucia |
| IAA | International Association of Art (various organizations) |
| IAA | Indoleacetic Acid |
| IAA | Industrie Agro-Alimentaire |
| IAA | Intel Application Accelerator (software) |
| IAA | Institute for Applied Autonomy |
| IAA | International Arbitration Act (Singapore) |
| IAA | Initial Address Acknowledgement |
| IAA | Intel Application Accelerator |
| IAA | Internationalen Automobil Ausstellung |
| IAA | International Achievement Awards (Industrial Fabric Association International) |
| IAA | Institute of Actuaries of Australia |
| IAA | Interagency Agreement(s) |
| IAA | Insurance Application Architecture (insurance) |
| IAA | Interactive Achievement Awards (Academy of Interactive Arts & Sciences) |
| IAA | Instituto Antartico Argentino (Spanish: Argentine Antarctic Institute; Argentina) |
| IAA | Investment Adviser Association (formerly Investment Counsel Association of America) |
| IAA | I Am Alive (emergency system) |
| IAA | International Aerospace Abstracts |
| IAA | Indianapolis Airport Authority |
| IAA | Igarka (Russia) |
| IAA | Interrupted Aortic Arch (genetic heart defect) |
| IAA | Intra-Abdominal Adiposity |
| IAA | Ishikawa Alumni Association (Japan) |
| IAA | Information about Alaska |
| IAA | Insulin Autoantibody |
| IAA | Illinois Alternate Assessment (education) |
| IAA | Irrigation Association of Australia |
| IAA | International Academy of Architecture |
| IAA | Interlochen Arts Academy |
| IAA | I Am Awsome |
| IAA | International Award Association |
| IAA | Indiana Apartment Association (Indianapolis, IN) |
| IAA | Identification and Authentication |
| IAA | Israeli Airports Authority |
| IAA | Information Assurance Advisory (US NSA) |
| IAA | Integrated Agriculture Aquaculture |
| IAA | Information Assurance Awareness (formerly known as Security Awareness, Training and Education program) |
| IAA | International Authentication Association (trade association) |
| IAA | Interim Administration of Afghanistan |
| IAA | Israel Association of Actuaries |
| IAA | Idyllwild Arts Academy (Idyllwild, California) |
| IAA | Ivey Alumni Association (Canada) |
| IAA | Investment Advisors Act of 1940 |
| IAA | Illinois Arts Alliance |
| IAA | Intergovernmental and Aboriginal Affairs (Canada) |
| IAA | Information Appliance Associates (California) |
| IAA | Islamic Affairs Analyst (publication) |
| IAA | International Assignment Agreement |
| IAA | Indie Artists Alliance (Castro Valley, CA) |
| IAA | Inter-Country Adoption Act (2000) |
| IAA | Idaho Aquaculture Association |
| IAA | I Am Away |
| IAA | I Absolutely Agree |
| IAA | Islamic Action Association |
| IAA | International Air Academy |
| IAA | Islamic Academy of Alabama (Birmingham, Alabama) |
| IAA | Institute for Alternative Agriculture |
| IAA | Indiana Aquaculture Association |
| IAA | Incident Awareness and Assessment |
| IAA | Interview and Advocacy Assessment (UK) |
| IAA | Interconnected Accredited AIS |
| IAA | I Am Annoyed |
| IAA | Interim Approval Authorization |
| IAA | Inactive Aircraft Authorization |
| IAA | Integrated Audit/Appraisal |
| IAA | Inter-American Association of Accountants |
| IAA | Internet Alcoholics Anonymous |
| IAA | Installation Application Administrator |
| IAA | Integration and Assembly |
| IAA | IUSS Acoustic Analysis |
| IAA | Identification, Authentication and Authorisation (IT security) |
| IAA | Intelligence Analysis Application |
| IAA | Inflatable Array Antenna |
| IAA | Internet Application Architect |