Giulio Piazza (1663âÂÂ1726) was a Roman Catholic cardinal.
On 22 Dec 1697, he was consecrated bishop by Gasparo Carpegna, Cardinal-Priest of Santa Maria in Trastevere, with Gregorio Giuseppe Gaetani de Aragonia, Titular Patriarch of Alexandria, and Antonio Spinelli, Bishop of Melfi e Rapolla, serving as co-consecrators.