T he 30-item shortened version of the Revised Child Anxiety and Depression Scale (RCADS-30) is a self-report instrument to assess symptoms of anxiety and depressive disorders. This study examined the factor structure, reliability, and construct validity of the RCADS-30, based on a sample of children and adolescents in clinical and community settings. Results provide evidence for (a) the six factors of the scale (separation anxiety disorder, generalized anxiety disorder, panic disorder, social phobia, obsessive-compulsive disorder, and major depressive disorder), (b) reliability (alpha and omega), and (c) convergent and discriminant validity against self-report and clinical interview criteria. The RCADS-30 demonstrated sound psychometric properties and that it is a suitable instrument to assess depression and anxiety disorder symptoms. Based on established cut-off scores, the scale also showed adequate capacity to differentiate emotional disorders from other mental disorders or the absence of diagnosis.