Pie-IX is a station on the Green Line of the Montreal Metro rapid transit system operated by the Société de transport de Montréal (STM). It is in the district of Hochelaga-Maisonneuve in the borough of Mercier–Hochelaga-Maisonneuve in Montreal, Quebec, Canada. This station is named for Pie-IX Boulevard (pronounced pea neuf). This street was named in 1912 for Pope Pius IX (1792–1878), elected Pope in 1846. English speakers often humorously refer to either the street or Metro station as "Pie Nine."

Pie-IX station was inaugurated on June 6, 1976, as part of the extension of the Green Line to Honoré-Beaugrand, in time for the 1976 Summer Olympics. The station includes a long mural in concrete and aluminum by Jordi Bonet entitled Citius, Altius, Fortius ("stronger, higher, faster" – the Olympic motto).