Girls represent a growing segment of the juvenile justice population in the United States, with a large number of them being victims of sexual, physical, and psychological abuse. These girls have special needs in terms of treatment and rehabilitation; however, little research exists on effective mental health treatments for female juvenile offenders in justice facilities. Despite the severity of anger-related behaviors displayed by girls in the juvenile justice system, no anger management treatments have been systematically developed to meet the unique treatment needs of delinquent girls. Treatment programs that provide gender-specific education, counseling, and emotional support are necessary for addressing the aggressive behaviors and psychological distress often displayed among this population. One such treatment program, the Juvenile Justice Anger Management (JJAM) for Girls, is an anger management program adapted from Lochman's Coping Power program, an empirically supported school-based anger management treatment for younger children. This study will evaluate the effectiveness of JJAM for Girls in reducing anger-related behaviors displayed by girls in the juvenile justice system.