Castanopsis evansii is a tree in the family Fagaceae. It is named for J. H. Evans, a governor of Puerto Princesa in the Philippines.
Castanopsis evansii grows as a tree up to tall with a trunk diameter of up to . The greyish bark is smooth, sometimes flaky. The coriaceous leaves measure up to long. Its ovoid nuts measure up to long.
Castanopsis evansii grows naturally in Borneo and the Philippines. Its habitat is dipterocarp forests up to elevation.