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 BRT, a bus rapid transit corridor on Pie-IX Boulevard in Montreal Pie IX, a song by Montreal band Suuns from their album Zeroes QC