Église Saint-Jean de Thiers, church located in Puy-de-Dôme, in France

Église Saint-Jean de Thiers is a Flamboyant Gothic church, the only one in Thiers predominantly Gothic, with a square light-gray stone bell tower topped by a cross and two tall arched openings. Its rough masonry facade has two tall arched windows with dark grilles, and a lower section with a small round window stands left of the tower. The church rises behind its cemetery on a rocky promontory above the Vallée des Usines.

The church stands at the centre of Thiers' second urban nucleus, founded in the 11th century; its oldest traces are Romanesque, with a small Romanesque vault still recorded west of the nave. It was rebuilt in Flamboyant Gothic in the 15th century, then absorbed into the city walls during the Wars of Religion, when it also served as a gate. Listed as a monument historique on 27 October 1986, it closed that October and reopened for guided tours in September 2020.

The name Saint-Jean du Passet comes from "pas", a narrow passage or difficult crossing in a valley, referring to the promontory over the Vallée des Usines. The church gave its name to the surrounding district, its cemetery and a former fortified gate. In 1622 the White Penitents of the Blessed Sacrament settled here, adding a sacristy, a deliberation room and a gallery in the western part.

The church stands on a rocky promontory south of Thiers' medieval centre, within the fifth fortified enclosure, above the Vallée des Usines. It is reached on foot through the Saint-Jean district and its cemetery. Since reopening in September 2020 it can be entered only during guided tours and temporary exhibitions, so check access before climbing up.

The bell tower's underground area was converted into an ossuary in the late 18th century, holding bones moved from the decommissioned Saint-Genès burial ground. The church reopened in September 2020 for the European Heritage Days, drawing 535 visitors to fully booked guided tours.