Constructions d’Automobiles Ageron et Cie was a French automobile manufacturer based in Lyons, active from 1908 to 1910. The company specialized in the production of conventional automobiles, primarily powered by a 10/12 horsepower four-cylinder engine.

A notable feature of Ageron's vehicles was their chain drive system, which was a common technology of the era. Additionally, the company introduced an innovative compressed air starting system designed by M. Ageron. It is believed that only a limited number of chassis were produced, primarily to showcase this unique starting mechanism.

Despite its brief existence, Ageron contributed to the early automotive landscape in France during the early 20th century.