The first mention of the existence of the Church of Saint-Martin de Nonancourt is a 12th-century charter, but the original building probably dates back to the 7th or 8th century. The bell tower that now occupies the middle of the façade dates from the reconstructions of 1204. During the Hundred Years' War, the church was largely destroyed, like many buildings in the region. The side aisles, nave, and choir were rebuilt in the 16th century. The Chapel of the Virgin, also known as the Chapel of the Rosary, was also added.
The Church of Saint-Martin contains numerous works of art, some of which are listed: neo-Gothic and Renaissance furnishings, including the centerpiece, the pulpit, a veritable wooden lacework; a variety of statuary, a 16th-century organ case and finally an enigmatic fresco discovered during recent works in 2001. The stained-glass windows of the church constitute a truly remarkable collection, both in terms of their number (26 in total) and their quality. The lower windows of the nave are the oldest pieces, dating from the 1500s, while the upper windows date from the 1520s and 1530s.