Calw (ˈkalf; previously pronounced ˈkalp and sometimes spelled Kalb accordingly) is a town in the middle of Baden-Württemberg in the south of Germany, capital and largest town of the district Calw. It is located in the Northern Black Forest and is approximately south of Pforzheim and west of Stuttgart. It has the status of a große Kreisstadt.
Calw is located in the valley of the Nagold in the Northern Black Forest at an altitude between above sea level. The historic centre lies west of the river. The newer parts of town have developed on the surrounding slopes. The following streams also exist within the town: the Tälesbach, Ziegelbach, Wurstbrunnenbach, Schießbach, Schlittenbach und Schweinbach. In the northern part of the town, on the western slope of the Nagold valley is the cave known as the Bruderhöhle.
The following towns and communities (Gemeinden) border on the town of Calw (clockwise, from the north):