El cuarto mandamiento (Spanish: The Fourth Commandment) is a 1948 Mexican drama film directed by Rolando Aguilar and starring Domingo Soler, Carmelita González, Sara Montes and Emma Roldán. The film's sets were designed by Manuel Fontanals. The film is about a family that is worried that their daughter is courted by a rich young man who likes the nightlife and luxury cars. The film is considered part of a group of family melodramas made in this period in which the dramatic tension revolves around old values, linked to a conservative order rooted in the past, which are pitted against new values associated with modernity, such as Cuando los hijos se van and A Family Like Many Others.