Xanthophyllum korthalsianum is a tree in the family Polygalaceae. It is named for the Dutch botanist Pieter Willem Korthals.
Xanthophyllum korthalsianum grows up to tall with a trunk diameter of up to . The inflorescences are branched and may be much longer than the leaves.
Xanthophyllum korthalsianum is a rare species, growing naturally in Sumatra and Borneo. Its habitat is ridge forest at around altitude.