Xanthophyllum montanum is a tree in the family Polygalaceae. The specific epithet Latin: [[:wikt:montanus|montanum]] is from the Latin meaning 'mountainous', referring to the tree's habitat.
Xanthophyllum montanum grows up to 30m (100feet) tall with a trunk diameter of up to 30cm (10inches). The smooth bark is orange-yellowish to green. The flowers are yellowish brown when dry. The round fruits are yellowish to greenish brown and measure up to 11NaN1 in diameter.
Xanthophyllum montanum is endemic to Borneo and known only from Mount Kinabalu in Malaysia's Sabah state. Its habitat is lower montane rain forest from 900m (3,000feet) to 1600m (5,200feet) elevation.