MIAC may refer to:
- Minnesota Indian Affairs Council, a liaison between the government of Minnesota and the Native American tribes in the state
- Minnesota Intercollegiate Athletic Conference, a college athletic conference which competes in the NCAA's Division III
- Mortgage Industry Advisory Corporation, a company specializing in third-party mortgage asset pricing services, secondary market hedge advisory solutions, comprehensive mortgage analytical pricing and hedging models and mortgage banking asset/liability solutions.
- Missouri Information Analysis Center, a fusion center collecting data from the Department of Homeland Security and local agencies to help Missouri police.
- Ministry of Internal Affairs and Communications, Japan's interior ministry.