This document provides guidance for teachers on preventing bullying in the classroom. It defines bullying and describes the typical roles of bullies, victims, and bystanders. The author recommends that teachers assess the extent of bullying in their classrooms, ensure students understand what bullying is, confront bullies in a fair manner, and consistently enforce consequences for bullying behaviors. Changing the school climate to reduce bullying requires effort from teachers, administrators, parents, and students working together.