Stigmella castaneaefoliella is a moth of the family Nepticulidae. It is found in North America in Kentucky, Ohio, Virginia, Illinois, Pennsylvania, New Jersey, Massachusetts, Florida and Ontario. The wingspan is 4-4.5 mm. The larvae feed on Castanea species, including Castanea dentata. They mine the leaves of their host plant. The larvae form very long, much contorted, linear mines with a fine central line of frass. The larva is bright green, the cocoon is ochraceous.