黑叶猴(Trachypithecus francoisi)是猴科乌叶猴属的一种。

身体长约50～60厘米，头小，尾巴较身体长，细长的四肢；头顶有直立的毛冠，体背毛比腹面的毛长而密，臀疣较大；全身黑色有光泽，耳基至两颊有白毛，手足均为黑色。

François' langur (Trachypithecus francoisi), also referred to as Francois' leaf monkey, Tonkin leaf monkey, or white side-burned black langur is a species of lutung and the type species of its species group. It is the least studied of the species belonging to the Colobinae subfamily.