The Archdiocese of St. John's, Newfoundland () is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church in St. John's, Newfoundland and Labrador, Canada. It is the metropolitan of an ecclesiastical province with two suffragan dioceses: Grand Falls, and Corner Brook and Labrador. The current archbishop is Peter Hundt. The Archdiocese of St. John's is the oldest Roman Catholic ecclesiastical jurisdiction in English-speaking North America.
