Largny-sur-Automne is a commune in the Aisne department in Hauts-de-France in northern France.
The garden of Les Charmettes, dedicated to the philosopher Jean-Jacques Rousseau, was created by Auguste Castellant from 1891. The garden and the buildings and statues in it have been a listed monument since 2008.
The village church was built in the 12th and 13th centuries.