Catholic-Hierarchy.org is an online database of bishops and dioceses of the Roman Catholic Church. The website is not officially sanctioned by the Church. It is run as a private project by David M. Cheney in Kansas City.

The Catholic Church describes as its hierarchy its bishops, priests and deacons. In the ecclesiastical sense of the term, "hierarchy" commonly means the body of persons who exercise authority within a Christian church. In the Catholic Church, authority rests chiefly with the bishops, while priests and deacons serve as their assistants, co-workers or helpers. Accordingly, "hierarchy of the Catholic Church" is also used to refer to bishops alone.