Sebastiano Martinelli was a Cardinal of the Roman Catholic Church who served as Prefect of the Congregation of Rites.

In the Catholic Church, the Dicastery for the Causes of Saints, previously named the Congregation for the Causes of Saints, is the dicastery of the Roman Curia that oversees the complex process that leads to the canonization of saints, passing through the steps of a declaration of "heroic virtues" and beatification. After preparing a case, including the approval of miracles, the case is presented to the pope, who decides whether or not to proceed with beatification or canonization.