Thornton Fractional Township High School District 215, more commonly known as T.F. District 215, is composed of two high schools and the supplementary Center for Academics and Technology.

Because of their excessively long names, among administrators and students alike, they are commonly referred to as T.F. North, T.F. South, and the CAT Center.

High schools

• Thornton Fractional Township North High School, in Calumet City, Illinois
• Thornton Fractional Township South High School, in Lansing, Illinois
• The Thornton Fractional Center for Academics and Technology, also in Calumet City