Église Saint-Martin de L'Isle-Adam, Gothic church in L'Isle-Adam, France.

The Église Saint-Martin is a Renaissance church built between 1487 and 1567, with a cruciform plan and a west facade on rue Saint-Lazare. Its light beige stone walls are topped by dark slate roofs, and a tall tower with an open columned lantern rises on the right. The facade has a large rose window with stone tracery above a recessed arched portal with a wooden door, while a smaller spire with a cross stands to the left. Inside, pale stone piers carry pointed arches and ribbed vaults over a central nave and side aisles; the rounded apse holds tall stained glass windows behind a white altar with a carved retable, and a dark wooden pulpit with a canopy is mounted high on a pier.

Begun in 1487 under Louis de Villiers, bishop of Beauvais, with funding from inhabitants, the church was first consecrated on 20 July 1499 while still unfinished. From 1537 Constable Anne de Montmorency entrusted its completion to architect Jean Bullant; the north aisle was finished in 1567 with a 300-livre advance from prior Pierre Massin, and Odet de Coligny consecrated it on 1 October 1567. A fire on 25 December 1661 damaged it, and the upper bell-tower storey was not rebuilt.

The church keeps the memory of its dead: between 1610 and 1776, 800 laypeople and 22 priests were buried inside, their epitaphs cut into the floor slabs without any tombstone. The furniture was gathered in the 19th century by abbé Jean-Baptiste Grimot, parish priest from 1848 to 1885; a bust of him stands in the garden around the church.

The church stands in the town centre, just south of the town hall, with its west facade on rue Saint-Lazare and the Grande-Rue running along its north side. A small garden shared with the presbytery, the Henri-Senlecq museum and the town hall's social office surrounds the building, so visitors can walk all the way around it. In the garden are a bust of Abbé Grimot, a column with a statuette of Saint Barbara, an element of the west portal replaced during a restoration, and Gothic colonnettes set into a stone block.

The small garden around the church holds a bust of Abbé Grimot, who restored the building from 1848 to 1885, along with a column bearing a statuette of Saint Barbara and a section of the old west portal replaced during restoration. Gothic colonnettes are gathered in a stone blocking among these vestiges.