Hose's langur (Presbytis hosei) is a species of primate in the family Cercopithecidae endemic to the island of Borneo, including Brunei, Kalimantan (Indonesia), and East Malaysia.

[2] It was first identified in Kutai National Park and Sangkulirang Peninsula, East Kalimantan, Indonesia, in 1985.

[5][6] In 1996, Hose's langurs of East Kalimantan, Indonesia, were among the most common primates in the area.

[7] The sudden drop in population arises from the rising demand for its bezoar stones and to prevent crop raiding, and the rapid deforestation and removal of the primate's habitat.

Densities of Hose's langurs positively correlate with tree height, height of the first bough, tree diameter, and canopy cover, and negatively with vegetation cover at low and ground level.