Aarau city church, Protestant church in Aarau, Switzerland.

Aarau city church is a late Gothic three-aisled basilica built 1471–1478 in the mendicant order style, with white-plastered walls under a long saddle roof. The stepped side aisles leave the clerestory of the central nave free, and the ridge runs to a three-sided choir. The tower from the previous church was kept and divided into six storeys by string courses; its top shows Baroque elements.

Construction of the present church began in 1471 under master builder Sebastian Gisel of Laufen, who kept the tower of the previous church, built in 1426/1427, and incorporated it into the new building. The stone blocks came mainly from the demolished Gösgen castle and were shipped down the Aare by barge. Work finished in 1478, and in July 1479 the auxiliary bishop of Konstanz consecrated the church to the Virgin Mary. The Reformation of 1528 destroyed the twelve altars and the images inside.

The church is used by the Reformed parish of Aarau and also by the Christian Catholic parish, which has held services here since 1876. The name Aarau city church distinguishes it from the town's other churches. On the church square stands the Gerechtigkeitsbrunnen (Fountain of Justice).

The church is centrally located in Aarau and easily accessible on foot. Visitors should check opening hours in advance and can observe the Gothic features from inside or join regular Protestant services.

The six choir windows are by Felix Hoffmann: three made 1940–1943 and installed in 1948, three more added in 1953. They form a Biblia pauperum of Old and New Testament scenes; the east-facing ones use darker tones against morning glare, the south choir wall ones lighter colours. Roland Guignard added eight side-aisle windows in 1968–1970 depicting the Lord's Prayer.