IHHA
| Acronym | Definition |
|---|---|
| IHHA | Irish Hard of Hearing Association |
| IHHA | International Heavy Haul Association |
| IHHA | Indian Heritage Hotels Association |
| IHHA | Indiana Hospital and Health Association |
| IHHA | Illinois Hospital and HealthSystems Association |
| IHHA | International Holistic Health Association |
| IHHA | Initial Health Hazard Analysis |
| IHHA | Illinois Harness Horsemens Association |