| Acronym | Definition |
|---|
| IACA | International Air Carrier Association |
| IACA | International Association of Crime Analysts |
| IACA | Indian Arts and Crafts Association |
| IACA | International Association of Commercial Administrators (formerly National Association of State Corporation Administrators) |
| IACA | International Association for Caribbean Archaeology (Trinidad & Tobago) |
| IACA | International Air Cargo Association |
| IACA | Indian Arts and Crafts Act of 1990 |
| IACA | International Association of Consulting Actuaries (International Actuaries Association; Canada) |
| IACA | Iranian American Community Alliance (Seattle, WA) |
| IACA | Interior Alaska Cancer Association (Fairbanks, AK) |
| IACA | International Association for Christian Action |
| IACA | International Academy of Comprehensive Aesthetics |
| IACA | International Air Cargo Assistance |
| IACA | International Air Charter Association |
| IACA | Indian American Catholic Association (Washington, DC) |
| IACA | Institute of Australian Consulting Arboriculturists (Carlingford, NSW, Australia) |
| IACA | Indiana Association of Chinese Americans |
| IACA | International A-Class Catamaran Association |
| IACA | Idaho Association of County Assessors |
| IACA | Inter-Agency Communications Agency |
| IACA | Integrated Active Circulator Antenna |