IAU or Iau may refer to:
Organizations
Universities
International American University International American University College of Medicine International Association of Universities Islamic American University Islamic Azad University Interamerican University of Puerto Rico
Others
International Astronomical Union International Association of Ultrarunners (IAU) is the governing body for ultra running Italian Actors Union, former name of the Guild of Italian American Actors, United States International Crossbow Shooting Union or International Armbrustschützen Union (IAU)
Other uses Immersion gold plating (IAu), a surface finish process in PCB manufacturing 5000 IAU, an asteroid Is Anyone Up?, defunct pornographic website
The Iau language An occasional spelling for Eiao, an uninhabited island in French Polynesia Robert Iau (1935–2005), Singaporean civil servant