Taddeo Gaddi (1520–1561) was an Italian Roman Catholic cardinal and bishop.
[1] Pope Paul IV made him a cardinal priest in the consistory of 15 March 1557.
[1] He received the red hat and the titular church of San Silvestro in Capite on 24 March 1557.
[1] He was a participant in the papal conclave of 1559 that elected Pope Pius IV.
[1] He died of stomach flu at the monastery of San Leonardo, Apulia on 22 December 1561.