The Big Eight Conference was an athletic conference of IHSAA Class AAA high schools located in Southwestern Indiana. The conference members were small city-based schools located in Daviess, Dubois, Gibson, Knox, Posey, and Warrick counties in Indiana and once included Wabash County in Illinois. The conference ceased operations with the 2019-20 Winter Season as the final spring season was canceled because of the 2020 Coronavirus Outbreak.