or Giovanni Stefano Ferrero (1568–1610) was a Roman Catholic prelate who served as Bishop of Vercelli (1599–1610) and Apostolic Nuncio to Emperor (1604–1607).
[1][2] Juan Esteban Ferrero was born in Biella, Italy on 3 November 1568 and ordained a priest in the Cistercian Order.
[3] On 29 March 1599, he was appointed during the papacy of Pope Clement VIII as Bishop of Vercelli.
[1][3] On 1 May 1599, he was consecrated bishop by Federico Borromeo (seniore), Archbishop of Milan, with Fabio Biondi, Titular Patriarch of Jerusalem, and Carlo Conti, Bishop of Ancona e Numana, serving as co-consecrators.
[3] On 20 January 1604, he was appointed during the papacy of Pope Clement VIII as Apostolic Nuncio to Emperor; he resigned on 3 May 1607.