Adeodato Giovanni Piazza, OCD was an Italian friar of the Discalced Carmelite Order, who became a cardinal of the Roman Catholic Church, and Patriarch of Venice, as well as a member of the Roman Curia in Vatican City.

The Patriarch of Venice is the ordinary bishop of the Archdiocese of Venice. The bishop is one of only four patriarchs in the Latin Church of the Catholic Church. The other three are the Patriarch of Lisbon, the Patriarch of the East Indies and the Latin Patriarch of Jerusalem. Presently, the only advantage of this purely formal title is the bishop's place of honor in papal processions. In the case of Venice, an additional privilege allows the patriarch, even if he is not a cardinal, the use of the colour red in non-liturgical vestments. In that case, the red biretta is topped by a tuft, as is the custom with other bishops who are not cardinals.