This article examines the impact of private high schools vs. public high schools on the academic performance of 15,270 undergraduate students registered at Ball State University. Students who went to religious high schools seem to outperform their private and public school counterparts. However, the impact of this advantage is a relatively small increase (0.055-0.073) in GPA on a four-point scale. Also, the impact of going to a religious high school seems to lessen as students proceed through college, disappearing entirely by the junior and senior years.