The Diocese of San Marco Argentano-Scalea is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Italy. Its episcopal see is Cosenza, Calabria. The diocese existed as the Diocese of San Marco since at least 1171, when the name of Bishop Ruben appears in a document. It is now a suffragan in the ecclesiastical province of the metropolitan Archdiocese of Cosenza-Bisignano.