Look up iah in Wiktionary, the free dictionary.
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