St. Gallen Cathedral, Abbey cathedral in St. Gallen, Switzerland

St. Gallen Cathedral is a late-Baroque church in St. Gallen, Switzerland, built from 1755 to 1766. Its east facade is flanked by two 68-metre towers with clock faces and green copper onion domes; the pale nave has a red tiled roof and tall arched windows. Inside, a rotunda joins the nave and choir, with ceiling frescoes framed by pale green and pink stucco.

The present church was begun in 1755 under Prince-Abbot Cölestin Gugger von Staudach, with the nave and rotunda built by Peter Thumb from plans by Gabriel Loser and Johann Caspar Bagnato; the foundation stone was laid in 1756 and the church consecrated in 1760. The choir was added from 1760 under Johann Michael Beer von Bildstein, and the towers were finished in 1766. Ceiling paintings are by Joseph Wannenmacher, and the interior was restored to its original state in 1962–67.

The church is the cathedral of the Diocese of St. Gallen, established in 1847, and also serves as the parish church of the cathedral parish. Its full dedication is to Saints Gallus and Otmar: Gall, the Irish monk who built his hermitage here in 612, and Otmar, the first abbot of the monastery from 719. The double choir stalls with reliefs from the life of Saint Benedict were carved by Joseph Anton Feuchtmayer.

The building opens its doors during the day for visitors who wish to explore the interior and reach the gallery. Guided tours provide insight into the architecture and explain details of the stucco work in the choir and altar area.

The south altar holds a bell that Saint Gall is said to have brought from Ireland, one of the three oldest surviving bells in Europe. The nine bells hang split between the towers: seven smaller ones in the south tower, the two bourdon bells in the north, and two more in the tower lanterns.