Juan de Castro (1431–1506) was a Spanish Roman Catholic bishop and cardinal.

The Archdiocese of Agrigento is a Latin Church ecclesiastical jurisdiction or archdiocese of the Catholic Church in Sicily, Italy. The historic diocese of Agrigento was also known as the Diocese of Girgenti, and Diocese of Agrigentum. It used to be a suffragan of the Archdiocese of Monreale. A metropolitan see, the Archdiocese of Agrigento has two suffragan dioceses in its ecclesiastical province.