Engelsberg Ironworks is a well-preserved ironworks with intact buildings and industrial equipment dating from the eighteenth and nineteenth centuries. It is an ironworks in Engelsberg, a village in Fagersta Municipality in Västmanland, Sweden. It was constructed in 1681 and developed into one of the world's most modern ironworks in the period 1700-1800. The site comprises the mansion and park, works offices, workers' homes, and industrial buildings. Engelsberg is the only ironworks in Sweden that still preserves the buildings and most of the technical equipment.