Santa Maria del Regno is a Romanesque church in Ardara, province of Sassari, Sardinia, Italy.
The church, together with the annexed castle of which ruins remain today, was built in the 11th century by Giorgia, daughter of the Giudice of Torres, as a Palace Chapel.
The church was built in dark basalt stone by Pisan workers (the island in the Middle Ages was under strong influence from the maritime Republic of Pisa).
The whole exterior of the edifice is characterized by false columns (lesenes) and Lombard bands; on the right are the remains of the square bell tower, which is missing the upper part.
In the middle, within a niche, is the wooden statue of Nostra Signora del Regno, a "Madonna with Child" wearing royal symbols.