Kalundborg is a Danish city with a population of 16,486, the main town of the municipality of the same name and the site of its municipal council. It is situated on the northwestern coast of the largest Danish island, Zealand, on the opposite, eastern side of which lies the capital Copenhagen, 110 km (68 mi) away.

Kalundborg Municipality is a kommune in the Region Sjælland on the west coast of the island of Zealand in Denmark. The municipality covers an area of 604 km2 (233 sq mi), and has a total population of 48,602. Its mayor is Martin Damm, a member of Venstre. The main town and the site of its municipal council is the city of Kalundborg.