Thomas Kelly College Preparatory High School is a public four-year high school located in the Brighton Park neighborhood on the southwest side of Chicago, Illinois, United States.

Kelly is the third largest Chicago public high school in terms of student population.

Kelly opened its doors as a junior high school on December 3, 1928, only serving grades six through ninth.

84% of students identified as Hispanic or Latino, 11% were Asian, 4% were black or African-American, and 2% were non-Hispanic white.

[4] Kelly competes in the Chicago Public League (CPL) and is a member of the Illinois High School Association (IHSA).