Guglielmo Bastoni (1544–1609) was a Roman Catholic prelate who served as Bishop of Pavia (1593–1609) and Apostolic Nuncio to Naples (1606–1609).
[3] On 30 Apr 1593, he was appointed during the papacy of Pope Clement VIII as Bishop of Pavia.
[1][2][3] On 6 May 1593, he was consecrated bishop by Michele Bonelli, Cardinal-Bishop of Albano, with Ludovico de Torres, Archbishop of Monreale, and Owen Lewis, Bishop of Cassano all'Jonio, serving as co-consecrators.
[3] On 26 May 1606, he was appointed during the papacy of Pope Paul V as Apostolic Nuncio to Naples.
[3] He served as Bishop of Pavia and Apostolic Nuncio to Naples until his death in Jan 1609.