Coordinates: 59°26′9.32″N 24°44′33.92″E / 59.4359222°N 24.7427556°E
St. Nicholas' Church (Estonian: Niguliste kirik) is a medieval former church in Tallinn, Estonia. It was dedicated to Saint Nicholas, the patron of the fishermen and sailors. Originally built in the 13th century, it was partially destroyed in Soviet Bombing of Tallinn in World War II. It has since been restored and today houses a branch of the Art Museum of Estonia, focusing mainly on ecclesiastical art from the Middle Ages onward. The former church is also used as a concert hall.
The church was founded and built around 1230–1275 by Westphalian merchants, who came from Gotland in the 13th century. While the city was still unfortified, the church had heavy bars for closing the entrances, loopholes and hiding places for refugees. When the fortifications around Tallinn were finished in the 14th century (the town wall enclosed the church and the settlement in 1310), the St. Nicholas' Church lost its defensive function and became a typical medieval parish church. There are only a few parts of the original church that have been preserved through the present.
In 1405–1420 St. Nicholas' church obtained its current appearance, when the central aisle received a clerestory above the side aisles in the form known in architecture as a basilica. In 1515 the tower was built higher and covered with late-Gothic spire. In late 17th century the tower was strengthened and secured. The spire was replaced with a Baroque spire with airy galleries, which was raised higher stage by stage through several centuries. The tower is now 105 metres (344.5 ft) high.