Pope Innocent IX (Latin: Innocentius IX), born Giovanni Antonio Facchinetti, was Pope from 29 October to 30 December 1591.
Prior to his short papacy, he had been a canon lawyer, diplomat, and chief administrator during the reign of Pope Gregory XIV.
Even before Pope Gregory XIV died, Spanish and anti-Spanish factions were electioneering for the next pope. Philip II of Spain's 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.
The cardinal protodeacon Andreas von Austria crowned Innocent IX as pontiff on 3 November 1591. He elevated two cardinals to the cardinalate in the only papal consistory of his papacy on 18 December 1591.
Innocent IX died in the early morning of 30 December 1591. He was buried in the Vatican grottoes in a simple tomb.