The 1591 papal conclave (27–29 October) was held after the death of Pope Gregory XIV on 16 October that year, after less than a year as pope. This left the Holy See vacant for the third time in 14 months. The conclave lasted only three days and elected Pope Innocent IX.
|Dates and location|
|27–29 October 1591|
Apostolic Palace, Papal States
|Sub-dean||Innico d'Avalos d'Aragona|
|Protopriest||Mark Sittich von Hohenems Altemps|
|Protodeacon||Andreas von Österreich|
|Giovanni Antonio Facchinetti|
Name taken: Innocent IX
Even before Pope Gregory XIV died, Spanish and anti-Spanish factions were electioneering for the next pope. Philip II of Spain's (r. 1556–1598) high-handed interference at the previous conclave was not forgotten: he had barred all but seven cardinals. This time the Spanish party in the College of Cardinals did not go so far, but they still controlled a majority, and after a quick conclave they raised Facchinetti to the papal chair as Pope Innocent IX. It took three ballots to elect him as pope. Facchinetti received 24 votes on 28 October but was not successful in that ballot to be elected as pope. He received 28 votes on 29 October in the second ballot while the third saw him prevail.
- "Miranda, Salvador. "October 27 to 29, 1591", Cardinals of the Holy Roman Church, Florida International University, 2018". Archived from the original on 2019-11-28. Retrieved 2019-07-17.
- "Sede Vacante 1591". 24 July 2015. Retrieved 21 January 2019.