Pope Pius IX was the longest-reigning pope of the Catholic church.
Pie-IX may also refer to:
- Pie-IX Boulevard, a thoroughfare in Montreal, Quebec
- Pie IX Bridge, a bridge connecting Montreal with Laval, Quebec
- Pie-IX (Montreal Metro), a rapid transit station on the Green Line of the Montreal Metro
- Pie IX, a song by Montreal band Suuns from their album Zeroes QC
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