St. Florian's Church, Baroque filial church in Upper Square, Ljubljana, Slovenia.

St. Florian's Church stands on Gornji trg (Upper Square) in Ljubljana's old town, not on Prešernov trg. Built from 1672, it was extended with chapels in 1698 and 1737 into a Baroque church on a Latin-cross plan. Jože Plečnik's 1933–34 remodelling moved the main entrance to a corner staircase at the former side door, above which is a large Marian fresco by Janez Potočnik.

The church was completed in 1696 as a filial church for the local community. When the Jesuit order returned to Slovenia in 1870, this building became a center for their activities and eventually gained recognition as a monument of national significance.

The church's Slovene name, Šentflorjanska cerkev, comes from Saint Florian, to whom it was dedicated after the 1660 fire that destroyed the Stari trg and Gornji trg squares. Its 1639 Marian image by Tomaž Kundišek, linked to a healing in 1694, made it a pilgrimage destination. Since 1870 it has been a centre of Jesuit activity.

The church stands on Gornji trg, not Prešernov trg, at the point where the street Ulica na Grad climbs toward the castle hill. Plečnik moved the main entrance to the former side door, reached by a redesigned corner staircase, so visitors enter from the side rather than the old portal.

The statue of St. John Nepomuk in the former main portal's niche was carved in 1727 by Francesco Robba for a bridge chapel over the Sava at Črnuče, and Plečnik later had it moved here. A portrait sculpture of a citizen of Roman Emona is set into the wall above the terrace.