Hammermøllen was a set of water mills at Hellebæk in Denmark, used to power the Kronborg weapons factory. The first mill on the site was built in 1576, but it was only linked to weapons production from 1601, when the gun foundry was built nearby. It then produced weapons until 1870, peaking in the 18th century, when the factory employed 200 men and produced 6000 guns a year.