Prieuré de Saint-Symphorien, Former priory with Romanesque bell tower in Bonnieux, France.

Prieuré de Saint-Symphorien is a former priory whose 12th-century bell tower rises from a wooded hillside above the Aigue Brun valley. The square tower is built of rubble stone framed by dressed-stone corner chains, with paired arched openings on two levels beneath a small projecting ledge, and a pyramidal tiled roof. A lower stone building with a shallow sloped roof extends to its right.

The priory was founded between 960 and 976 under the authority of Saint-Victor Abbey in Marseille. Throughout the 11th and 12th centuries, it served as both a religious center and shelter for travelers on pilgrim routes.

The church was first called Saint-Pierre, then Saint-Pierre et Saint-Symphorien, before taking the name Saint-Symphorien. A stone reused above the door of the building carried an inscription naming four founders, Rostang, Teutbert, Ailald and Pons, and stating that Pons ministered in the church; the stone disappeared in early 1962.

The priory is private property and cannot be visited inside; the 12th-century bell tower is seen from a distance, rising from the wooded hillside. It stands above the old Marseille-to-Apt road in the Aigue Brun valley, near the junction of the D943 and D113. The church is listed as a monument historique since 1949, the bell tower since 1921.

The bell tower's paired arched openings are divided by a single small column, and the whole structure is built of rubble masonry framed by dressed-stone corner chains. The tower stands alone among the trees; the church beside it is private property and not open to visitors.