Église Saint-Cast de Saint-Cast-le-Guildo, Gothic Revival church in Saint-Cast-le-Guildo, France

The église Saint-Cast de Saint-Cast-le-Guildo is a Gothic Revival granite church in the town center of Saint-Cast-le-Guildo, in Brittany, France. It follows a cross-shaped plan with a central nave, two side aisles, five bays, and a tower topped by a spire.

Built in 1897-1899 to plans by architect Ernest Le Guerranic (1831-1915), the church was blessed in 1899 and consecrated on 21 August 1932. It replaced an earlier church near the presbytery that had become too small and dilapidated; that old building was demolished in 1913. The earlier church had once depended on the monks of Saint-Jacut.

A stained glass window in the north transept shows the 1758 Battle of Saint-Cast, with Breton troops near a mill and a figure of the Virgin in a chariot surrounded by angels. Inscriptions along the scene let visitors follow the story without any prior knowledge of the event.

Sunday mass is celebrated at 10:30, and the church is open to visitors during the week. The entrance is through the projecting portal at the base of the tower, where two hanging flower baskets flank the doorway. The building stands in the town centre, with the granite exterior and slate roof visible from the surrounding streets.

A high-relief escutcheon on the exterior showing the lords of Val is listed as a historic monument on its own. The three bells inside the tower each carry a personal name and inscriptions recording the details of their blessing ceremony.