Église de la Sainte-Trinité de Choisy-au-Bac, Gothic church in Choisy-au-Bac, France

The Église de la Sainte-Trinité de Choisy-au-Bac is a church blending Romanesque and Gothic styles located in a small French village. The building features a strong tower with multiple bays that distribute space throughout the structure.

The church began construction in the early 12th century with a Romanesque nave that was later expanded with a transept and facade. These building phases reflect the transition from Romanesque to Gothic design during the medieval period.

The parish church is dedicated to the Holy Trinity, and its founder is unknown; the older basilica of Saint-Étienne, linked to the Merovingian royal palace, was abandoned during the French Revolution. Sunday Mass is still celebrated here at 9:30, and the church belongs to the parish of the Seize Bienheureuses Carmélites de Compiègne.

The church stands on rue de l'Aigle, facing the town hall, with a parvis that doubles as a car park. The chevet can only be seen from the south, while the north side and the rest are enclosed in private property. Sunday Mass is celebrated at 9:30 a.m.

The bell tower is the most authentic part of the building, spared the neo-Gothic remodelling of 1853–1885. It is the only tower in the region with so many openings on its belfry stage: three tall pointed arches framed by columns, as seen on the south face.