The Diocese of Ciudad Valles () is a Latin Church ecclesiastical territory diocese of the Catholic Church in Mexico. The diocese was erected on 27 November 1960. It is a suffragan in the ecclesiastical province of the metropolitan Archdiocese of San Luis PotosÃÂ. It was a suffragan of the Archdiocese of Monterrey until 25 November 2006. It cathedra is found within the Cathedral of Our Lady of Guadalupe in the episcopal see of Ciudad Valles, San Luis PotosÃÂ.