Frederiksborg Castle is a palatial complex in Hillerød, Denmark. It was built as a royal residence for King Christian IV of Denmark-Norway in the early 17th century, replacing an older castle acquired by Frederick II and becoming the largest Renaissance residence in Scandinavia. On three islets in the Slotssøen, it is adjoined by a large formal garden in the Baroque style.

Hillerød is a Danish town with a population of 36,043 located in the centre of North Zealand approximately 30 km to the north of Copenhagen, Denmark. Hillerød is the administrative centre of Hillerød Municipality and also the administrative seat of Region Hovedstaden, one of the five regions in Denmark. It is most known for its large Renaissance castle, Frederiksborg Castle, now home to the Museum of National History. Hillerød station is the terminus of one of the radials of the S-train network as well as several local railway lines. The town is surrounded by the former royal forests of Gribskov to the north and Store Dyrehave to the south.