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.