Independent School League or ISL may refer to: *

Independent School League (Illinois) 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 m ...

, a group of nine Chicago-area preparatory schools *

Independent School League (New England) The Independent School League (ISL) is an athletic conference of sixteen private college-preparatory schools in Greater Boston. Its parent organization is the New England Preparatory School Athletic Council (NEPSAC). Founded in 1948, the ISL s ...

, a group of 16 New England preparatory schools * Independent School League (Washington, D.C. area), a group of 17 Washington, D.C. preparatory schools * Interscholastic League of Honolulu, a group of Hawaiian private schools

See also