The Archdiocese of Vercelli (in Latin, Archidioecesis Vercellensis) is a Roman Catholic ecclesiastical territory in northern Italy, one of the two archdioceses which form the ecclesiastical region of Piedmont. The archbishop's seat is in Vercelli Cathedral. The dioceses suffragan to Vercelli are: Alessandria (della Paglia), Biella, Casale Monferrato and Novara.