Andean saddle-back tamarin

The Andean saddle-back tamarin (Leontocebus leucogenys) is a species of saddle-back tamarin, a type of small monkey from South America. The Andean saddle-back tamarin was formerly considered to be a subspecies of the brown-mantled tamarin, L. fuscicollis. It is closely related to Illiger's saddle-back tamarin. It is endemic to Peru and its type locality is in the Department of Huanuco, Peru.

The Andean saddle-back tamarin has a head and body length of between 205 mm and 230 mm with a tail length between 305 mm and 330 mm long. It weighs between 350 g and 400 g.

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