The Mid-State 6 Conference was a high school athletics conference in central Illinois, made up of the high schools in Peoria, Illinois plus various other schools over the course of its existence. It existed for several decades. Previous names included MidState 8 and MidState 9 in the 1960s, and Mid-State 10 in the 1980s and 1990s. As of December 2013, the only schools remaining were in the city of Peoria: Peoria Notre Dame and the three general public high schools Manual, Peoria (Central), and Richwoods. Those schools were joined the Big 12 Conference in 2014.