IAH

IAH may refer to:


 * George Bush Intercontinental Airport (IATA code), an airport in Houston, Texas, United States
 * Iah, a god of the moon in ancient Egyptian religion
 * Iah (queen), a king's mother of ancient Egypt during the 11th dynasty
 * International Association of Hydrogeologists, a scientific and educational organisation
 * Workers International Relief, a Berlin-based organisation whose name in German is Internationale Arbeiter-Hilfe