The Four Rivers Conference was a high school conference in north central Illinois. The conference participated in athletics and activities in the Illinois High School Association. The conference included small public high schools with enrollments between 150-550 students in Boone, DeKalb, Lee and Winnebago counties. The conference was named for the 4 rivers that ran through its geographic area, the Rock River, Pecatonica River, Kishwaukee River and Sugar River.