The Roman Catholic Archdiocese of Hobart is a Latin Church archdiocese of the Catholic Church in Australia located in Hobart and covering Tasmania, Australia. Immediately subject to the Holy See, the area covered was initially administered by the Vicariate Apostolic of New Holland and Van Diemen's Land. In 1842, the Vicariate Apostolic of Hobart was erected; elevated as a diocese a few weeks later; and as an archdiocese in 1888. St Mary's Cathedral is the seat of the Catholic Archbishop of Hobart, currently Julian Porteous.