| IACAC | Illinois Association for College Admission Counseling 
| Others |
| IACAC | Inter-American Anti-corruption Convention
| Others |
| IACAC | Inter-American Convention Against Corruption
| Others |
| IACAC | International Air Cargo Association of Chicago
| Others |
| IACAC | International Association of Civil Aviation Chaplains (Germany)
| Others |
| IACAC | Iowa Association for College Admission Counseling (Newton, IA)
| Others |