The Revised Child Anxiety and Depression Scale-Parent Version (RCADS-P) is a parent-report questionnaire that assesses dimensions of DSM anxiety and depressive disorders in youths. Previous studies have found that the RCADS-P possesses clinical utility and strong psychometric properties in both clinic- and school-based populations. To increase applicability of the measure to a greater proportion of the individuals accessing mental health services, the present study sought to develop and examine the psychometric properties of a Spanish version of the RCADS-P. As completed by parents of 85 publicly referred children and adolescents, the RCADS-P demonstrated good internal consistency and convergent, discriminant, and divergent validity. Confirmatory factor analysis also supported a six-factor model consistent with the measure’s six subscales: separation anxiety disorder, social phobia, generalized anxiety disorder, panic disorder, obsessive-compulsive disorder, and major depressive disorder. A secondary aim of this study was to evaluate the validity and reliability of a shortened, 25-item version of the Spanish translation of the RCADS-P, which also evidenced favorable psychometric properties. Findings provide support for the Spanish version of the RCADS-P as an efficient and informative parent-report measure of youths’ internalizing behaviors.