IAU (disambiguation)
- 5000 IAU
- Eiao
- Iau language
- Immersion gold plating
- Interamerican University of Puerto Rico
- International American University
- International American University College of Medicine
- International Association of Ultrarunners
- International Association of Universities
- International Astronomical Union
- International Crossbow Shooting Union
- Is Anyone Up?
- Islamic American University
- Islamic Azad University
- Italian Actors Union