Castanopsis psilophylla is a tree in the family Fagaceae. The specific epithet psilophylla means 'smooth leaves'.
Castanopsis psilophylla grows as a tree up to tall with a trunk diameter of up to . The brown bark is smooth or with fine fissures. The coriaceous leaves measure up to long. Its ovoid nuts measure up to long and are considered edible.
Castanopsis psilophylla grows naturally in Borneo and the Philippines. Its habitat is hill dipterocarp forests up to elevation.