Theodorskirche, Gothic church in Kleinbasel, Switzerland.

Theodorskirche is a Gothic church in the Wettstein quarter of Kleinbasel, Basel. After the 1356 Basel earthquake, only its north tower was rebuilt, so the church today has a single tower. It is used by a Protestant Reformed congregation.

The church was first mentioned in a document in 1084 and belonged to the monastery of St. Alban at the start of the 12th century. The Basel earthquake of 1356 severely damaged it: both towers partially collapsed and only the north tower was rebuilt. Graves from the 8th century were found inside the church in 1947.

The church is dedicated to Saint Theodore, a name documented for the mother church by 1255, when the daughter chapel St. Niklaus was built near the Rhine bridge. In 1984, a skeleton excavated in a former poor cemetery beside the church became known as Theo der Pfeifenraucher (Theo the Pipe Smoker). The building remains in use by a Protestant Reformed congregation.

The church is easily accessible and centrally located in the Kleinbasel quarter, walkable from the city center. Visitors should keep in mind that active services and community events may affect access, so it is worth checking opening times before your visit.

Archaeological digs between 1984 and 1993 uncovered multiple graves from the 11th century beneath the church floor. These findings reveal that the grounds served as a burial site for local residents over many generations.