The Roman Catholic Archdiocese of New Orleans, (Latin: Archidioecesis Novae Aureliae, French: Archidiocèse de la Nouvelle-Orléans), is an ecclesiastical division of the Roman Catholic Church administered from New Orleans, Louisiana.

It is the second-oldest diocese in the present-day United States, having been elevated to the rank of diocese on April 25, 1793, by Pope Pius VI during Spanish colonial rule.

Our Lady of Prompt Succor and St. Louis, King of France are the patron saints of the Archdiocese and Cathedral Basilica of Saint Louis is its mother church as St. Patrick's Church serves as the Pro-Cathedral of the Archdiocese.

Led by an archbishop, the Archdiocese of New Orleans is the center of a larger ecclesiastical province that encompasses the entire state of Louisiana.

The Metropolitan Province of New Orleans include the suffragan Dioceses of Alexandria, Baton Rouge, Houma-Thibodaux, Lafayette, Lake Charles, and Shreveport.

On June 12, 2009, Pope Benedict XVI names Bishop Gregory Michael Aymond of the Diocese of Austin to be Archbishop of New Orleans.

Archbishop Aymond is installed on August 20, 2009 at Saint Louis Cathedral.