Carlo Odescalchi, was an Italian prince and priest, Archbishop of Ferrara, cardinal of the Catholic Church and Vicar General of the Diocese of Rome. For years a close collaborator of popes Pius VII and Gregory XVI, in 1838 he renounced his titles in order to become a Jesuit.

The Archdiocese of Ferrara-Comacchio is a Latin Church archdiocese of the Catholic Church. It has existed since 1986, when the diocese of Comacchio was combined with the historical archdiocese of Ferrara. It is a suffragan of the archdiocese of Bologna.