The Phayre's leaf monkey (Trachypithecus phayrei), also known as Phayre's langur, is a species of lutung native to Southeast Asia including India, Bangladesh, Myanmar, Thailand, Laos, Vietnam and China. It is listed as Endangered on the IUCN Red List and is threatened by hunting and loss of habitat.The species epithet commemorates Arthur Purves Phayre. It is mostly arboreal and feeds on leaves of a large number of tree species. In Tripura, India, it mainly feeds on leaves of Albizia procera, Albizzia lebbek and A. stipulata, Melocanna bambusoides, Macaranga denticulata, Callicarpa arborea, Dillenia pentagyna, Litsea sp., Mikania scandens, Gmelina arborea, Artocarpus chaplasha, Syzygium fruticosum, Ficus racemosa, Ficus hispida, Ficus indica, and F. fistulosa. The three accepted subspecies of this lutung are: