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

Jerome of Périgord, in Spanish Jerónimo, was a French monk who became the bishop of several dioceses in Spain. He was a companion of Rodrigo Díaz de Vivar, and in 1097 or 1098 became the bishop of Valencia after Rodrigo's conquest of the city. Forced to abandon it following Rodrigo's death, Jerome entered the service of Duke Raymond of Galicia in 1102 and became bishop over the churches in Salamanca, Ávila and Zamora.