The Archdiocese of Sydney (Latin: Archidioecesis Sydneyensis) is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church. Its episcopal see is Sydney, New South Wales, Australia.
Erected in 1842, the archdiocese is the metropolitan see for the suffragan dioceses of Armidale, Bathurst, Broken Bay, Lismore, Maitland-Newcastle, Parramatta, Wagga Wagga, Wilcannia-Forbes and Wollongong. The Military Ordinariate of Australia, as well as the Melkite Catholic Eparchy of St Michael, Archangel and the Maronite Diocese of St Maroun—these latter two Eastern Catholic—are also associated with the archdiocese.