The former Italian Catholic Diocese of San Severino, in the Province of Macerata, Marche in Central Italy, existed until 1986. In that year it was united into the Archdiocese of Camerino to form the Archdiocese of Camerino-San Severino Marche.

The Diocese of Recanati was a Roman Catholic diocese in Italy. It was founded in 1240 by Pope Gregory IX.