Ascanio Piccolomini (died 13 May 1597) was a Roman Catholic prelate who served as Archbishop of Siena (1588–1597) and Titular Archbishop of Colossae (1579–1588).
[1][2] On 3 July 1579, Ascanio Piccolomini was appointed during the papacy of Pope Gregory XIII as Coadjutor Archbishop of Siena and Titular Archbishop of Colossae.
[1][2] On 11 September 1579, he was consecrated bishop by Spinello Benci, Bishop of Montepulciano, with Claudio Borghese, Bishop of Grosseto, and Francesco Maria Piccolomini, Bishop of Pienza, serving as co-consecrators.
[1][2] He served as Archbishop of Siena until his death on 13 May 1597.
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