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

Look up IAU, Iau, iau, iaʻu, -iau, or i-au in Wiktionary, the free dictionary.

Iau is:

• The Iau language
• An occasional spelling for Eiao

This disambiguation page lists articles associated with the title IAU.
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