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

The Archdiocese of Oviedo is an Latin Church Archdiocese of the Catholic Church in Spain. The archdiocese encompasses roughly the current autonomous community of Asturias or Principality of Asturias. Erected in the 9th century, the diocese was elevated to an archdiocese in 1954. The diocesan see is in the city of Oviedo, where the Catedral de San Salvador is located.