In recent years, bullying seems to have become more serious and more pervasive. Research indicates that 15% to 20% of all students are victimized by bullies at some point in their school careers. Clearly, bullying is a problem that schools must recognize and address. Bullying has three distinguishing characteristics: (1) it is intentional; (2) it takes place more than once; and (3) there is an imbalance of power between the bully and the victim. In short, bullying is one-sided. Bullying is not the same as a single incident of teasing. Rather, it is an abuse of power by one person over another. It is also different from the normal conflicts of childhood. Being taunted or attacked physically can be one of the most painful experiences of childhood and can leave lasting psychological scars. Victims may experience anxiety, low self-esteem, depression, and even suicidal thoughts. They may view school, where most incidents of bullying take place, as an unsafe, anxiety-provoking environment and may be afraid of attending. Some may even refuse to go to school rather than face the ordeal of bullying. Fortunately, schools have strategies to prevent bullying. These strategies are most effective when they are part of a comprehensive prevention program implemented at the district, school, and classroom levels. Teachers are at the core of any bullying prevention program, and many of the lessons students need to learn that discourage bullying must come from the teacher--through guidance to individual students or through instruction to the whole class by integrating anti-bullying lessons into the curriculum. The most effective way to deal with bullying is to prevent it from happening in the first place. This article presents nine ways to bully-proof the classroom.