| Conference | IHSA |
|---|---|
| Founded | 1991 (football), 1995 (all sports) |
| No. of teams | 10 |
| Region | Northern Illinois (Boone, DeKalb, Lee, Ogle, Whiteside, and Winnebago counties) |
The Big Northern Conference (BNC) is an organization of ten high schools in northern Illinois. These high schools are members of the Illinois High School Association.
The high schools of the Big Northern Conference are located in the following counties: Boone, DeKalb, LaSalle, Lee, Ogle, Whiteside, and Winnebago.