Castanopsis megacarpa is a tree in the family Fagaceae. The specific epithet is from the Greek meaning 'large fruit'.
Description Castanopsis megacarpa grows as a tree up to tall with a trunk diameter of up to . The grey bark is smooth or slightly fissured. The coriaceous leaves measure up to long. Its roundish or ellipsoid nuts measure up to long.
Distribution and habitat Castanopsis megacarpa grows naturally in Borneo, Peninsular Malaysia and Singapore, and Peninsular Thailand. Its habitat is dipterocarp, kerangas or lower montane forests up to elevation.
Uses The wood is locally used in making domestic items.
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