The purpose of this study was to examine the executive function of 4th- to 6th-grade students in three distinctively different private school environments: a Montessori school, a classical school, and a Catholic school. Using the Behavior Rating Inventory of Executive Function, parent-teacher dyads rated the executive function of 112 students. Results indicated differences in executive function ratings according to school environment, as well as by the source of the rating, with parents tending to rate their children higher as compared to the teacher ratings. (Contains 1 table.)