| Acronym | Definition |
|---|
| IAH | International Association of Hydrogeologists |
| IAH | Institute for the Arts and Humanities (various locations) |
| IAH | Institute for Animal Health (UK) |
| IAH | Imagine a Horse (Texas) |
| IAH | Inova Alexandria Hospital (Alexandria, VA) |
| IAH | In All Honesty |
| IAH | International Association of Hypno-Analysts |
| IAH | International Association of Hydrologists |
| IAH | Is Anybody Home? (Our Lady Peace song) |
| IAH | I Am Hydrogen (Phish song) |
| IAH | Inertial Attitude Hold |
| IAH | Houston, TX, USA - George Bush Houston Intercontinental (airport code) |