Stadtkirche St. Dionys, Gothic church building in Esslingen am Neckar, Germany

Stadtkirche St. Dionys is a Gothic church on the south side of Esslingen's market square. Its north tower, raised to 59 metres, and its south tower, 55.5 metres, stand at different heights; the taller central octagonal spire rises above a squared stone tower with narrow arched windows. The long red-brown roof and tall pointed-arch windows with tracery face the square, and a small green-roofed structure sits at the base of the central tower.

A St. Vitalis church stood here around 700, and its successor of the late 9th century was the largest stone church in inner Swabia at the time. After King Frederick II gave the parish to Speyer Cathedral in 1213, the Gothic St. Dionys was built: the choir was replaced in 1297, the nave extended westward around 1300, and the towers raised to 59 and 55.5 metres by about 1320.

The choir's seven windows keep an almost intact set of early 14th-century stained glass, the only such ensemble in Germany never altered by 19th-century restoration. Five windows hold the original panels, arranged in four columns and fourteen rows; the animal cycle survives in only six of its original 24 pieces. In 1942 the glass was removed for safekeeping and remounted after the war in an order proposed by Hans Wentzel, completed in 1953 with fifteen modern pieces by Adolf Saile.

The church stands on the south side of Esslingen's market square, next to the Catholic Münster St. Paul and the Frauenkirche, so the three can be seen on one walk. Inside, the building axis visibly bends where the 1297 choir was added, and the flat wooden ceiling and tall pointed-arch windows shape the nave.

The church keeps an almost intact set of early 14th-century stained glass, the only such ensemble in Germany never altered by 19th-century restoration or cleaning. Five choir windows still hold mostly original panels; in 1942 the glass was removed for safekeeping and remounted after the war in an order proposed by Hans Wentzel, with fifteen modern pieces by Adolf Saile added by 1953.