Automobiles Grégoire was a French car manufacturer, established in 1902, that operated for about twenty years in the early 20th century. The company was the creation of Pierre Joseph Grégoire (1876 - 1962). After World War I, Grégoire introduced its first car with an overhead-valve engine. Although the engine was only 2.3 litre, the car could reach up to mph (km/h). The manufacture of this model was expensive, and it had disappointing financial results. In 1923, Grégoire only produced engines for the Bignan company. Grégoire closed its factory down in 1924.