| 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 |
