Kungliga borgen, Royal pavilion on Ladugårdsgärdet, Stockholm, Sweden

Kungliga borgen is a prefabricated, transportable building on a hill at Ladugårdsgärdet in Stockholm, designed by Fredrik Blom and built in 1818–22 for Karl XIV Johan. It has a flat roof and characteristic Empire details, and was assembled from modules made in Stockholm. A 1982 replica stands on the site after a 1977 fire.

Karl XIV Johan had Borgen built between 1818 and 1822 on a hill west of Drottningberget, designed by Fredrik Blom as the king's resting place during military exercises on Ladugårdsgärdet. It burned to the ground in 1977; because the old interior was removed for renovation at the time, it survived and was reinstalled in an exact copy erected in 1982.

Borgen takes its name from the castle-like look Fredrik Blom gave the building. On the king's name day a supper was held for the public and a tent was raised on the flat roof. A painting by Fredric Westin from 1838 shows Karl XIV Johan on a white horse with Borgen behind him. Today the building is rented out for parties and as a restaurant.

The building stands on a hill by Greve von Essens väg on Ladugårdsgärdet, west of Drottningberget. It is owned by Kungliga Djurgårdsförvaltningen and rented out as a restaurant and party venue, so access depends on bookings and events rather than regular opening hours.

The building is one of Fredrik Blom's prefabricated, movable houses: it was built in modules in Stockholm, then transported up and assembled on the hilltop. The same method was used for nearby Rosendal Palace, completed in 1826. The original interior had been removed for renovation before the 1977 fire, so it could be reinstalled after the 1982 reconstruction.