- For the Risorgimento fighter of this name, see Girolamo Simoncelli (1817-1852).
Girolamo Simoncelli (1522, Orvieto, then in the Papal States – 24 February 1605, Rome) was an Italian cardinal.
Simoncelli was made a cardinal by his great-uncle, Pope Julius III, in the consistory of 22 December 1553. He was elected bishop of Orvieto in 1554 and administrator in 1570. He took part in the two conclaves in April and May 1555, those in 1559 and 1565–66, the two in September and October–December 1590, and those in 1591 and 1592. He was cardinal protopriest from 1598 onwards and vice-dean of the College of Cardinals from 1603.
- Miranda, Salvador (1998–2015). "The Cardinals of the Holy Roman Church". Florida International University. Retrieved 10 January 2017.
- Boyle, Alan (12 February 2013). "Why the buzz over St. Malachy's 'last pope' prophecy outdoes 2012 hype". NBC News. Retrieved 17 February 2013.
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