The Independent School League (ISL) is an athletic conference comprising 9 private secondary schools in the Chicago metro area. All but one of the schools are also full members of the Illinois High School Association, the governing body for most high school athletics and competitive activities in the state. The schools are all relatively small, most belonging to the smaller classes of competition offered by the IHSA.

Members

Other conference affiliations

History

The ISL was founded in 1967. The league initially comprised eight teams: Chicago Lab, Elgin, Latin, Morgan Park, North Shore, Francis W. Parker, Harvard-St. George, and Glenwood. Harvard-St. George closed in 1993, and Glenwood closed its high school in 1979. Lake Forest Academy left the ISL in 2008 and rejoined in 2021. Regina Dominican High School joined in 2022. Morgan Park Academy left the ISL in 2023. Elgin Academy closed in 2024.

Membership timeline

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IHSA State titles