CIAC may refer to:
Athletic conferences Carolinas Intercollegiate Athletic Conference, southeastern United States Connecticut Interscholastic Athletic Conference Central Intercollegiate Athletic Conference, Kansas and Missouri
Other uses Clark International Airport Corporation, Pampanga, Philippines Colombian Aeronautical Industry Corporation, or CIAC for its acronym in Spanish Community in a Cube, a housing development in Middlesbrough, United Kingdom Computer Incident Advisory Capability, at the United States Department of Energy CRACK International Art Camp, Rahimpur, Kushtia, Bangladesh