Ouvrage Chesnois, also known as Ouvrage Chênois, is a gros ouvrage of the Maginot Line, located in the Fortified Sector of Montmédy, facing Belgium. The ouvrage lies between the towns of and Thonne-le-Thil. It possesses six combat blocks. It is located between gros ouvrage Thonnelle and petit ouvrvage La Ferté. The position was sabotaged and abandoned by French forces that were ordered to retreat from the exposed position in June 1940 during the Battle of France. The ouvrage is now abandoned and sealed.