The last decade has seen a noticeable increase in the number of treatment outcome studies for pediatric obsessive-compulsive disorder (OCD). The present article describes a meta-analysis of this literature with the aim of quantifying treatment effects and examining the extent to which various patient or treatment variables are related to outcome. Results showed that pharmacotherapy with serotonergic antidepressants and cognitive-behavioral therapy involving exposure and response prevention are each effective in reducing OCD symptoms. Cognitive-behavioral therapy produced larger effect sizes and greater rates of clinically significant improvement compared to medication, although there were methodological differences between medication and psychotherapy studies.