Frederik's Church (Danish: Frederiks Kirke), popularly known as The Marble Church (Marmorkirken) for its rococo architecture, is an Evangelical Lutheran church in Copenhagen, Denmark. The church forms the focal point of the Frederiksstaden district; it is located due west of Amalienborg Palace.
The Evangelical-Lutheran Church in Denmark or National Church (Danish: Folkekirken lit. 'the People's Church', or unofficially den danske folkekirke, 'the Danish People's Church'; Greenlandic: Ilagiit lit. 'the Congregation'), sometimes called the Church of Denmark, is the established, state-supported church in Denmark. The supreme secular authority of the church is composed of the reigning monarch and Denmark's Parliament, the Folketing. As of 2025, 70.7% of the population of Denmark are members, though membership is voluntary.
Christianity was introduced to Denmark in the 9th century by Ansgar, Archbishop of Hamburg-Bremen. In the 10th century, King Harald Bluetooth became Christian and began organizing the church, and by the 11th century, the country was fully Christianized. Since the Reformation in Denmark, the church has been Lutheran, while retaining much of its high church pre-Reformation liturgical traditions.