| IACA | Independent Automotive Consultants Association 
| Others |
| IACA | India American Cultural Association
| Others |
| IACA | Indian Arts and Crafts Act
| Others |
| IACA | Indian Arts and Crafts Association
| Others |
| IACA | Indiana Association of Chinese Americans
| Others |
| IACA | Indo American Cancer Association
| Others |
| IACA | Indo-American Cancer Association
| Others |
| IACA | Institute Audit Compliance Advisement
| Others |
| IACA | Institute of Australian Consulting Arboriculturists
| Others |
| IACA | Intel Architecture Code Analyzer
| Others |
| IACA | International Academy of Chiropractic Acupuncture
| Others |
| IACA | International Air Carrier Association
| Others |
| IACA | International Anti Corruption Academy
| Others |
| IACA | International Anti-Corruption Academy
| Others |
| IACA | International Association for Caribbean Archaeology
| Others |
| IACA | International Association for Court Administration
| Others |
| IACA | International Association of Commercial Administrators
| Others |
| IACA | International Association of Comprehensive Aesthetics
| Others |
| IACA | International Association of Consulting Actuaries
| Others |
| IACA | International Association of Crime Analysts
| Others |
| IACA | International Association of Currency Affairs
| Others |
| IACA | Iowa Connections Academy
| Others |
| IACA | Iranian American Community Alliance
| Others |
| IACA | Italian American Civic Association
| Others |