| IAA | 2-iodoacetamide 
| Others |
| IAA | I Am Awesome
| Others |
| IAA | Icelandic Automobile Association
| Others |
| IAA | Idle Air Adjuster
| Others |
| IAA | Ignorant and Apathetic
| Others |
| IAA | Illinois Arborist Association
| Others |
| IAA | Immigration Advisers Authority
| Others |
| IAA | Immigration Assessment Authority
| Others |
| IAA | Impact Acceleration Accounts
| Others |
| IAA | Imperial Affairs Agency
| Others |
| IAA | Independent A-Arm
| Others |
| IAA | Independent Ambulance Association
| Others |
| IAA | Independent Automotive Advocates
| Others |
| IAA | Indian Aircraft Act
| Others |
| IAA | Indian Association of Alberta
| Others |
| IAA | Indiana Apartment Association
| Others |
| IAA | Indianapolis Airport Authority
| Others |
| IAA | Indole 3 Acetic Acid
| Others |
| IAA | Indole Acetic Acid
| Others |
| IAA | Indole-3-acetic acid
| Others |
| IAA | Information Affairs Authority
| Others |
| IAA | Initial Address Acknowledgement
| Others |
| IAA | Institute of Accountancy Arusha
| Others |
| IAA | Institute of Actuaries of Australia
| Others |
| IAA | Insurance Application Architecture
| Others |
| IAA | Insurance Auto Auctions
| Others |
| IAA | Insurrectional Army of America
| Others |
| IAA | Integrated Arts Academy
| Others |
| IAA | Intel Application Accelerator
| Others |
| IAA | Intelligent Aerodynamic Automobile
| Others |
| IAA | Intensive Action Area
| Others |
| IAA | InterAmerican Academy
| Others |
| IAA | Interior AIDS Association
| Others |
| IAA | Intermediaries Agents and Appointees
| Others |
| IAA | Internal Accounting Association
| Others |
| IAA | International Academy Amman
| Others |
| IAA | International Academy of Architecture
| Others |
| IAA | International Academy of Astronautics
| Others |
| IAA | International Achievement Awards
| Others |
| IAA | International Actuarial Association
| Others |
| IAA | International Advertising Association
| Others |
| IAA | International Aerospace Abstracts
| Others |
| IAA | International Affairs Agency
| Others |
| IAA | International Airfreight Associates
| Others |
| IAA | International Anaplastology Association
| Others |
| IAA | International Association for Aerobiology
| Others |
| IAA | International Association for Aesthetics
| Others |
| IAA | International Association for Assyriology
| Others |
| IAA | International Association of Art
| Others |
| IAA | International Association of Astacology
| Others |
| IAA | International Automobile Association
| Others |
| IAA | International Awards Associates
| Others |
| IAA | Internationale Automobil Ausstellung
| Others |
| IAA | Internationale Automobil Ausstellung (International Automobile Exhibition)
| Others |
| IAA | Internationale Automobil-Ausstellung
| Others |
| IAA | Internationalen Automobil Ausstellung
| Others |
| IAA | Internet Association of Australia
| Others |
| IAA | Interrupted Aortic Arch
| Others |
| IAA | Investment Adviser Association
| Others |
| IAA | Iodo Acetic Acid
| Others |
| IAA | Irish Aviation Authority
| Others |
| IAA | Israel Airports Authority
| Others |
| IAA | Israel Antiquities Authority
| Others |
| IAA | Israel Association of Actuaries
| Others |
| IAA | Istituto d'Asta Autoveicoli
| Others |
| IAA | Italian Automotive Academy
| Others |