St Martin's stands immediately adjacent to the Cloth Hall on the Grote Markt, and like the hall it was reduced to ruins in the First World War and entirely rebuilt during the interwar period. The current building faithfully follows the 13th-century Gothic original, with a single tower, flying buttresses, and the austere Flemish Gothic proportions that distinguish the church from French models.
Inside, the most notable features are the original choir stalls that survived the war — removed and stored before the bombardment — and the tomb of Cornelius Jansen, the bishop of Ypres who gave his name to Jansenism, the Catholic theological movement that caused decades of controversy in France and Belgium in the 17th century. The church also contains a relic of Ypres' pre-war history in the form of some original stonework preserved in the rebuilt walls. Entry is free; the church is open most days.