The Stellantis Poissy plant is a car plant belonging to Stellantis located in Poissy, Yvelines, France. It is dedicated to the manufacturer's Platform 1 cars, which are cars in the subcompact class, with an annual output of approximately 200,000 cars. Together with the R&D Centres at Carrières-sous-Poissy and at Vélizy, it is one of three major establishments that the company runs in the department.
The Poissy plant was commissioned by Ford France in 1937 and opened in 1940 a few weeks before the German invasion. When, in 1954, Ford sold their business to Simca, the Poissy plant was included in the deal. Less than ten years later Simca closed their existing plant at Nanterre, leaving Poissy as their only significant auto-production facility. Ownership passed again in 1963, this time to Chrysler who in that year acquired a controlling interest in Simca.
In 1978 Peugeot acquired Chrysler's European business. Former Simca models were rebadged as Talbots and continued to be produced at the Poissy plant during the early 1980s. However, the mid-range hatchback that had been designed to sustain the Talbot brand was rebadged ahead of its 1985 launch as the Peugeot 309. That is the name under which it was sold, and since that time the plant has concentrated on the production of small Citroën and Peugeot badged models.