The St. Charles's Church (German: Karlskirche) is a church situated on the south side of Karlsplatz, Vienna. It is located on the edge of the 1st district, 200 metres outside the Ringstraße. It is one of the most outstanding baroque church structures, and boasts a dome in the form of an elongated ellipsoid.
Ever since Karlsplatz was restored as an ensemble in the late 1980s, the Karlskirche has garnered fame due to its dome and its two flanking columns of bas-reliefs, as well as its role as an architectural counterweight to the buildings of the Musikverein and of the Vienna University of Technology.
The church is cared for by a religious order and has long been the parish church as well as the seat of the Catholic student ministry of the Vienna University of Technology.