Jean, chevalier du Teil de Beaumont (7 July 1738 – 25 April 1820), seigneur d'Ancy, was a French soldier in the Ancien Régime, Revolutionary and Imperial armies and theoretician of the use of artillery (the Gribeauval system).

The son of the artillery officer François du Teil (1704–1758), knight of the order of Saint-Louis, and of Marguerite de Chambaran (died 1758), he became an artillery officer himself at a very young age.

Disdaining this last posting, he left it as soon as possible to go to command the artillery in the Alps, and the representatives of the people chose as his replacement then Brigadier General Napoleon Bonaparte, who gained his first successes in this role.

Discharged from the army as an aristocrat, he was only recalled to the ranks under the Consulate, when he was put in command of the place de Lille, then that of Metz.

He was made a commander of the Légion d’Honneur then a knight of the order of Saint Louis.