St. Joseph High School (or St. Joe's) was a Roman Catholic, coeducational, college prep school in Westchester, Illinois, and was sponsored by the De La Salle Christian Brothers. St. Joseph High School became accredited by the North Central Association of Colleges and Secondary Schools in 1987 and was approved by the Illinois State Board of Education. St. Joe's was a member of the National Catholic Educational Association and the Christian Brothers Educational Association. The school was also a member of the Illinois High School Association (IHSA) and the Chicago Catholic League (CCL).