Florianikirche, Protected church building in Margareten, Vienna, Austria.

Florianikirche is a Roman Catholic parish church at Wiedner Hauptstrasse 99 in Vienna's Margareten district, set back from the street with its right long side on Laurenzgasse. Built 1961–1963 as a reinforced-concrete skeleton by Rudolf Schwarz, it has a tall central nave whose walls are entirely glazed with 1960s stained glass by Giselbert Hoke, flanked by low side aisles and a flat choir end.

Built 1961–1963 as a reinforced-concrete skeleton structure to plans by German church architect Rudolf Schwarz, the church was completed after his death by his wife Maria Schwarz and colleague Johann Petermaier, and consecrated to St. Florian on 20 October 1963 by Archbishop Coadjutor Franz Jachym. From 2005 to 2016 it also housed the Jugendkirche Wien, adapted in 2007/08 with new heating, lighting, sound system and an entrance to the right aisle. It succeeded the Alte Pfarrkirche Matzleinsdorf, known as the Rauchfangkehrerkirche.

Since the 1970s the church has hosted the annual Florianimesse of the Mödling district fire brigade youth, as St. Florian is the patron saint of firefighters. The church succeeded the Alte Pfarrkirche Matzleinsdorf, known as the "Rauchfangkehrerkirche". From 2005 to 2016 it also housed the Jugendkirche Wien, a project of the Catholic Youth of the Archdiocese of Vienna.

The church stands slightly set back from Wiedner Hauptstrasse at number 99, with its right long side on Laurenzgasse in Hungelbrunn. The entrance to the right aisle was rebuilt in 2007/08. Access is tied to services of the parish community St. Florian, so check times before visiting.

The claim that the Pietà on the church forecourt is the renovated Mariensäule of the Favoritner Räderkreuz-Richtstätte Reder is refuted: old photographs show differences in the figures that no restoration can explain. The coloured glass windows of the 1960s are by Giselbert Hoke.