Mart Stam (August 5, 1899 – February 21, 1986) was a Dutch architect, urban planner, and furniture designer. Stam was extraordinarily well-connected, and his career intersects with important moments in the history of 20th-century European architecture, including chair design at the Bauhaus, the Weissenhof Estate, the Van Nelle Factory, an important modernist landmark building in Rotterdam, buildings for Ernst May's New Frankfurt housing project then to Russia with the idealistic May Brigade, to postwar reconstruction in Germany.