The white-headed langur (Trachypithecus leucocephalus ) is a critically endangered species of langur endemic to Guangxi, China.
This species is blackish in color with white crown, cheeks, and neck (in contrast to the similar T. poliocephalus, which has a golden crown, cheeks, and neck).
This species has a very small range in the province of Guangxi in southernmost China, where it is known from a few scattered populations. The Zuo River separates this species from Francois' langur, which is found to the north.
This species is considered critically endangered on the IUCN Red List. It is thought to have a population of no more than 600 individuals with roughly 250 mature individuals. None of the subpopulations of this species have more than 25 individuals. The main threat to this species is poaching and to a lesser extent habitat destruction. In addition, Francois' langurs have been released within the species' range and they have been known to hybridize with the white-headed langur, which may be genetically detrimental to it.