Archdiocese of Cincinnati

The Archdiocese of Cincinnati (Latin: Archidiœcesis Cincinnatensis) is a Latin Church ecclesiastical jurisdiction, or archdiocese, of the Catholic Church that covers all of the dioceses in the State of Ohio.

As of 2025, the archbishop of Cincinnati is Robert Casey. The mother church is the Cathedral Basilica of St. Peter in Chains in Cincinnati.

The Archdiocese of Cincinnati encompasses 230 parishes in 19 counties. Cincinnati is the metropolis of the Ecclesiastical Province of Cincinnati, which contains all of Ohio. The province contains the archdiocese and its five suffragan dioceses:

The archdiocese is bordered by:

During the 17th century, present day Ohio was part of the French colony of New France. The Diocese of Quebec had jurisdiction over the region. However, unlike other parts of the future American Midwest, French missionaries made no attempts to found Catholic missions in Ohio.

In 1763, Ohio Country became part of the British Province of Quebec, forbidden from settlement by American colonists. After the American Revolution ended in 1783, Pope Pius VI erected in 1784 the Prefecture Apostolic of the United States, encompassing the entire territory of the new nation. In 1787, the Ohio area became part of the Northwest Territory of the United States. Pius VI created the Diocese of Baltimore, the first diocese in the United States, to replace the prefecture apostolic in 1789.

In 1808, Pope Pius VII erected the Diocese of Bardstown in Kentucky, with jurisdiction over the new state of Ohio along with the other midwest states.

Cincinnati's first Catholic church, Christ Church, was organized in 1819, just beyond the city boundaries. Soon additional parishes were formed in Hamilton and St. Martin, Brown County. Reverend Emmanuel Thienpont pioneered many parishes in the archdiocese.