IAU (disambiguation)

IAU may refer to:

• Immersion gold plating (IAu), a surface finish process in PCB manufacturing
• International Astronomical Union
• International American University
• International American University College of Medicine
• International Association of Universities
• International Association of Ultrarunners (IAU) is the governing body for ultra running
• Islamic American University
• Islamic Azad University
• Italian Actors Union, former name of the Guild of Italian American Actors, United States
• 5000 IAU, an asteroid
• Is Anyone Up?
• International Crossbow Shooting Union or International Armbrustschützen Union (IAU)
• Interamerican University of Puerto Rico

Iau is:

• The Iau language
• An occasional spelling for Eiao