The Diocese of Segovia is a Latin diocese of the Catholic Church located in the city of Segovia in the ecclesiastical province of Valladolid in Spain.

The Metropolitan Archdiocese of Valladolid is an Latin Church diocese of the Catholic Church in Spain. It was erected as the Diocese of Valladolid by Pope Clement VIII on September 25, 1595, and was elevated to the rank of a metropolitan archdiocese by Pope Pius IX on July 4, 1857, with the suffragan sees of Ávila, Ciudad Rodrigo, Salamanca, Segovia, and Zamora.