Villar San Costanzo is a comune (municipality) in the Province of Cuneo in the Italian region Piedmont, located about 70 kilometres (43 mi) southwest of Turin and about 15 kilometres (9 mi) northwest of Cuneo.

[3] Sights to see in Villar San Costanzo include the natural reserve known as Ciciu del Villar; the Abbey built in early 700 AD; and the very ancient church of San Costanzo al Monte, a stunning example of Romanesque-Gothic architecture dating back to the 12th century.

The town takes its name from Saint Constantius, a soldier of the Theban Legion, who is said to have been beheaded at the spot now occupied by the sanctuary of San Costanzo al Monte.

[4] The local geologic formation known as Ciciu del Villar, which are columns formed by natural erosion, was connected with Constantius' legend: the stones are said to be the Roman soldiers sent to kill him, who were miraculously petrified before they could harm the saint.

[4] Villar San Costanzo borders the following municipalities: Busca, Dronero and Roccabruna.