Castanopsis oligoneura is a tree in the family Fagaceae. The specific epithet is from the Greek meaning 'few nerves', referring to the leaf venation.
Description Castanopsis oligoneura grows as a tree up to tall with a trunk diameter of up to . The brownish bark is smooth to lenticellate. The coriaceous leaves measure up to long. Its roundish nuts measure up to long.
Distribution and habitat Castanopsis oligoneura is endemic to Borneo. Its habitat is lowland dipterocarp forests up to elevation.
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