Marcello Semeraro (born 22 December 1947) is an Italian prelate of the Catholic Church who has been the Prefect of the Congregation for the Causes of Saints since October 2020.

He was previously Bishop of Albano and secretary to the group of cardinals named by Pope Francis to advise him.

That Synod's final statement pointed to social injustice as the root cause of terrorism and decried third world debt and "the enduring drama of hunger and extreme poverty".

[3] On 4 November 2013, Pope Francis appointed him Apostolic Administrator of the Exarchic Monastery and Territorial Abbacy of Saint Mary of Grottaferrata.

[6] On 25 October 2020, Pope Francis announced he would raise him to the rank of cardinal at a consistory scheduled for 28 November 2020.