Castelpetroso is a municipality in the Province of Isernia in the Italian region Molise, located about 25 km west of Campobasso and about 10 km south-east of Isernia.

Maria Santissima Addolorata is the nickname with which Catholics venerate Maria following the apparitions that, in 1888, two peasant women at Castelpetroso, in the province of Isernia . Following this episode Carlo Acquaderni promoted, together with bishop Palmieri, a fundraiser for the construction of a sanctuary, which was designed by the engineer Francesco Gualandi of Bologna. The first stone was laid on September 28, 1890, while the consecration and inauguration took place on September 21, 1975.

Map: Castelpetroso
Map: Castelpetroso