Gonystylus calophyllus is a tree in the family Thymelaeaceae. The specific epithet calophyllus means 'beautiful leaves'.
Gonystylus calophyllus grows as a small tree up to 9m (30feet) tall. The twigs are dark brown.
Gonystylus calophyllus is endemic to Borneo, where it is known only from Sarawak. Its habitat is lowland mixed dipterocarp forest. It is threatened by lowland deforestation.