| Abbreviation | Definition |
|---|---|
| IAC | Idaho Association of Counties |
| IACA | Indo American Cancer Association |
| IACAC | Illinois Association for College Admission Counseling |
| IACAC | International Air Cargo Association of Chicago |
| IACAC | International Association of Civil Aviation Chaplains (Germany) |
| IACAC | Iowa Association for College Admission Counseling (Newton, IA) |
| IACC | Indonesian Association for Clinical Chemistry |
| IACC | International Association of Commercial Collectors |
| IACC | Islamic Association of Collin County |
| IACCI | International Association of Cultural and Creative Industries |
| IACCP | International Association for Cross Cultural Psychology |
| IACCP | International Association of Christian Counseling Profesisonals |
| IACCP | International Association of Christian Counseling Professionals |
| IACD | Indian Association of Chiropractic Doctors |
| IACE | Illinois Association of County Engineers |
| IACE | International Association for Cultural Exchange |
| IACES | Idaho Association for Counselor Education and Supervision |
| IACES | Irish Association for Contemporary European Studies |
| IACET | International Association of Continuing Education and Training |
| IACH | International Association of Communication in Healthcare |