Xanthophyllum obscurum is a tree in the family Polygalaceae. The specific epithet ' is from the Latin meaning 'dark', referring to the dark colour of the dried flowers and fruits.
Xanthophyllum obscurum grows up to tall with a trunk diameter of up to . The smooth bark is pale and brown-grey. The flowers are white or purple. The edible, round fruits are brown or blackish and measure up to in diameter.
Xanthophyllum obscurum grows naturally in southern Thailand and western Malesia. Its habitat is lowland mixed dipterocarp and lower montane forests from sea-level to altitude.