The study examined perfectionism, symptoms of obsessive-compulsive disorder (OCD) and depression, and peer relationships among a clinical sample of 31 youth (age range 7-18 years) diagnosed with OCD. Using a correlational design, perfectionistic beliefs accounted for significant variance in OCD symptoms, depressive symptoms, and difficulties in peer relationships for children with OCD. One dimension of perfectionism, sensitivity to mistakes, was the most salient maladaptive aspect of perfectionism for this sample whereas another dimension, contingent self-esteem, emerged as the most salient adaptive dimension. Implications are discussed regarding the diagnosis, treatment, and developmental course of OCD among children and adolescents.