Lesson's saddle-back tamarin (Leontocebus fuscus) is a species of saddle-back tamarin, a type of small monkey from South America.

[2][3] Genetic analysis showed it to be more closely related to the black-mantled tamarin than to the brown-mantled tamarin.

[3] Its type locality is in Colombia, in Plaines de Mocoa, Putumayo, between the Rio Putumayo and Rio Caqueta.

[3] The IUCN rates it as least concern from a conservation standpoint.

This New World monkey-related article is a stub.