The Hatinh langur (Trachypithecus hatinhensis)[3] is a highly threatened Old World monkey found in limestone forests in Vietnam, primarily in the Quảng Bình Province.

A recent survey discovered a small population living in the Quảng Trị Province.

The local Van Kieu minority refer to this monkey as the 'Con Cung', which roughly translates as "black, cliff-dwelling monkey with a long tail".

[4] It resembles the closely related François' langur (T. francoisi), but its white cheek-stripes typically extend behind the ears onto the nape (there are significant individual variations, however), and the overall black colour is non-glossy and has a brownish tinge.

[6] It has often been considered a subspecies of the François' langur, but was elevated to a full species by Bradon-Jones in 1995,[7] and this was followed by Groves, 2005.