The brown-mantled tamarin (Saguinus fuscicollis), also known as the saddleback tamarin or the Andean saddle-back tamarin, is a species of tamarin from South America. It is found in Bolivia, Brazil, Colombia, Ecuador, and Peru. The brown-mantled tamarin is sympatric with the pygmy marmoset, sharing the same habitat in South American counties, and will often raid the gum holes of this species. Brown-mantled tamarins occupy an extensive area of northern Amazonia.