Castanopsis fulva is a tree in the beech family Fagaceae. The specific epithet ' is from the Latin meaning 'tawny', referring to the indumentum.
Castanopsis fulva grows as a tree up to tall with a trunk diameter of up to . The bark is smooth or fissured. The coriaceous leaves measure up to long. Its ovoid or conical nuts measure up to long.
Castanopsis fulva grows naturally in Borneo, Peninsular Malaysia and Sumatra. Its habitat is hill dipterocarp and kerangas forests up to altitude.