Evangelical-Lutheran Church in Württemberg
Calw was originally part of the Roman Catholic Diocese of Speyer. From 1534, in Calw as in the rest of the Duchy of Württemberg, the Reformation took force. In 1555, Calw became the seat of a deanery, which still exists today. The Deanery of Calw encompasses 43 congregations of the Evangelical-Lutheran Church in Württemberg. In the town of Calw there is the greater congregation of Calw, comprising the town-centre congregation (Calw Stadtkirche), the Bergkirche congregation of Wimberg/Alzenberg, and the Versöhnungskirche congregation of Heumaden, of which the last two came into existence only after the arrival of "Heimatvertriebene" after World War II. There are also congregations in the villages of Altburg, Hirsau, Holzbronn und Stammheim.