Ippolito (I) d'Este was an Italian Roman Catholic cardinal, and Archbishop of Esztergom. He was a member of the ducal House of Este of Ferrara, and was usually referred to as the Cardinal of Ferrara. Though a bishop of five separate dioceses, he was never consecrated a bishop. He spent much of his time supporting the ducal house of Ferrara and negotiating on their behalf with the Pope.

The Archdiocese of Esztergom–Budapest is a Latin Church archdiocese and primatial seat of the Catholic Church in Hungary and the metropolitan see of one of Hungary's four Latin Church ecclesiastical provinces.