Pellacalyx cristatus is a tree in the family Rhizophoraceae. The specific epithet cristatus means 'crested', referring to the .
Pellacalyx cristatus grows up to tall, with a stem diameter of . The smooth bark is brown to yellow. The leaves are ovate to oblong and measure up to long.
Pellacalyx cristatus is endemic to Borneo. Its habitat is in hilly areas, to elevations of .