The meta-analysis of the treatment outcome studies of cognitive-behavioral therapy (CBT) for anger-related problems in children and adolescents included 21 published and 19 unpublished reports. The mean effect size (Cohen’s d = 0.67) was in the medium range and consistent with the effects of psychotherapy with children in general. The differential effects of skills training, problem solving, affective education, and multimodal interventions (d = 0.79, 0.67, 0.36, and 0.74, respectively) were variable although also generally in the medium range. Skills training and multimodal treatments were more effective in reducing aggressive behavior and improving social skills. However, problem-solving treatments were more effective in reducing subjective anger experiences. Modeling, feedback, and homework techniques were positively related to the magnitude of effect size.