IIAC may refer to:

Sports

• Interstate Intercollegiate Athletic Conference, a now-defunct college athletics conference, formerly Illinois Intercollegiate Athletic Conference
• Iowa Intercollegiate Athletic Conference, the former name of a college athletics conference now known as the American Rivers Conference

Other uses

• Incheon International Airport Corporation, a corporation which operates Incheon International Airport (Airport of Republic of Korea)

• Institut Interdisciplinaire d'Anthropologie du Contemporain, a French research institute

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