Bullying refers to aggressive behavior that is repetitive and intentional in which a power differential exists between the victim and bully. The negative effects of bullying on an individual’s mental and physical health are substantial and in line with other major forms of child maltreatment. Efforts to increase detection of bullying are indicated, especially among youth presenting with school phobia, depression, anxiety, and declining school performance. Several antibullying efforts have been developed and promoted at the school and community level. Research indicates that many of these programs are effective and share some common elements that can help reduce the prevalence and impact of bullying.