| Acronym | Definition |
|---|
| IHAC➣Information Highway Advisory Council |
| IHAC➣Institute for the History of Ancient Civilizations (Changchun, China) |
| IHAC➣Inhouse Appraisal Corporation |
| IHAC➣I Have A Customer |
| IHAC➣Industrial Health Advisory Committee |
| IHAC➣International Humanitarian Aid Concern |
| IHAC➣Industry Hills Aquatic Club (City of Industry, CA) |
| IHAC➣Intergovernmental Higher Academic Council (Russia) |
| IHAC➣International Historic Automobile Club |