The Diocese of Shreveport is a Latin Church ecclesiastical territory, or diocese, of the Catholic Church covering the parishes of northern Louisiana in the United States.

The Archdiocese of New Orleans is a Latin Church ecclesiastical division of the Catholic Church spanning Jefferson, Orleans, Plaquemines, St. Bernard, St. Charles, St. John the Baptist, St. Tammany, and Washington civil parishes of southeastern Louisiana. It is the second to the Archdiocese of Baltimore in age among the present dioceses in the United States, having been elevated to the rank of diocese on April 25, 1793, during Spanish colonial rule.