The patroness of Masone is Our Lady of the Assumption, celebrated on 15 August. The parish church of Cristo Re e Nostra Signora Assunta, opened for worship in 1927, with three naves in Baroque style, is the third-largest church in the diocese of Acqui after the cathedral and the parish of Ovada; it holds the diocese's first bell concert (the fourth in Liguria), made up of eleven bells in B2 major, ten of which were cast in 1959.
The old parish church of Nostra Signora Assunta, today the oratory of the Nativity of Mary, was built between 1580 and 1584 by the feudal lord Lazzaro Grimaldi Cebà, Doge of the Republic of Genoa, and suffered serious structural damage during the destruction of the local castle; it is today the seat of the Archconfraternity of the Nativity of Mary and Saint Charles. In the hamlet of Cappelletta stands instead the sanctuary of Nostra Signora del Santissimo Nome di Maria, whose main feast is celebrated the Sunday after 8 September, with an evocative Saturday procession carrying artistic crucifixes.
