This study investigates the high school principal’s role in the students’ misbehavior. The findings indicated that this role is a central one, as principals in secondary education are called to design, inspire and implement strategies and policies effectively. Furthermore, it was concluded that both the contribution of the state with training, funding, and a well defined legislative context, and the harmonious cooperation between principals and the Teachers’ and Parents’ Associations is crucial, for this principals’ role to be successfully fulfilled.