| IHAC | Idaho Hunger Action Council 
| Others |
| IHAC | Illinois Healthcare Action Coalition
| Others |
| IHAC | Indiana Health Advocacy Coalition
| Others |
| IHAC | Information Highway Advisory Committee
| Others |
| IHAC | Information Highway Advisory Council
| Others |
| IHAC | Institute for Human Animal Connection
| Others |
| IHAC | Institute for the History of Ancient Civilizations
| Others |
| IHAC | International Higher Academic Council
| Others |
| IHAC | International Horsemans Advisory Committee
| Others |
| IHAC | Internationale Historische Automobiel Club
| Others |
| IHAC | Ion Highway Advisory Council
| Others |
| IHAC | Iron Horse Athletic Club
| Others |