The Roman Catholic Archdiocese of León (Latin: Archidioecesis Leonensis) is an ecclesiastical territory or Metropolitan diocese of the Roman Catholic Church based in the Mexican city of León, Guanajuato.

It currently covers an area of 41,940 km2,[dubious – discuss] and has a population of 6,500,000, including the states of Guanajuato and Querétaro.

The Archdiocese of León is the metropolitan see of the suffragan dioceses of Irapuato, Celaya, Querétaro.

The Archdiocese of León covers the municipalities of León, Guanajuato, San Felipe, Ocampo, San Francisco del Rincón, Purísima del Rincón, Romita, Silao and Cd.

The Diocese of Querétaro covers 18 municipalities of the State of Querétaro and 7 municipalities of Guanajuato: Atarjea, Docto Mora, San José Iturbide, Santa Catarina, Tierra Blanca, Victoria, and Xichú.