Nostra Signora de Regnos Altos, Religious museum in Bosa, Italy.

Nostra Signora de Regnos Altos is a chapel located inside Serravalle Castle with a rectangular layout and wooden roof. The building serves as both an active worship space with regular services and a museum for visitors to explore.

The chapel was built as a palatine structure between the 12th and 13th centuries. In the 14th century, Giovanni d'Arborea commissioned frescoes that decorated its interior walls.

The frescoes were uncovered in 1972 during restoration and date from a cycle painted between 1317 and 1370, commissioned around 1338–1340 by Giovanni d'Arborea. On the left wall visitors can pick out the Adoration of the Magi and a Last Supper with the apostles named in sequence, while the counter-facade shows Saint Martin and the beggar and Saint George killing the dragon. Sixteenth-century graffiti, including a naval battle between three men in Iberian dress, cut into the painted surface.

The chapel stands within the walls of Serravalle Castle on the hill above Bosa, reached on foot along the climb up to the castle; the entrance was moved to the side facing the parade ground. The single rectangular room with a wooden truss roof and semicircular apse is small, and the 1972 frescoes on the side walls and counter-facade are best seen in daylight.

The 1847 find was a Virgo lactans, a wooden figure of the Virgin nursing the infant Jesus, retrieved from the castle ruins by a boy. The image was judged miraculous, and the chapel took the title Sos Regnos Altos, "the high kingdoms", for its position above Bosa.