Saint Leopold's Church is the Roman Catholic parish church of Donaufeld in Floridsdorf, the 21st district of Vienna, Austria. Located at Kinzerplatz, it stands at a height of 96 m (315 feet), which makes it the third tallest church in Vienna. Construction was completed in 1914.
Earlier plans to use the church as a cathedral for a new diocese east of the Danube were abandoned when Floridsdorf was merged into Vienna in 1904. The rectory was built under the premise of serving as a bishop's residence. Today the parish belongs to the Archdiocese of Vienna and is entrusted to the pastoral care of the Augustinian Canons of Klosterneuburg.