| Abbreviation | Definition |
|---|---|
| IAAR | Institute of African American Research |
| IAAR | International Association for Asset Recovery |
| IAAR | International Association Of Accredited Registrars |
| IAAR | Israeli Association For Aerosol Research |
| IAAS | International Association for Ambulatory Surgery |
| IAATE | International Association of Avian Trainers and Educators |
| IABO | Indiana Association of Building Officials |
| IABO | International Association for Biological Oceanography |
| IABO | International Association of Basketball Officials |
| IABs | International Association for Biologicals |
| IABSE | International Association For Bridge And Structural Engineering |
| IABSOIWA | International Association of Bridge, Structural, & Ornamental Iron Workers of America |
| IAC | International Association for Cybernetics |
| IAC | International Association of Counselling |
| IACA | International Air Carrier Association |
| IACA | International Association for Caribbean Archaeology |
| IACA | International Association of Commercial Administrators |
| IACA | International Association of Consulting Actuaries |
| IACA | International Association of Crime Analysts |
| IACC | Indo-Arab Confederation Council |