The purpose of the present study is to establish the prevalence of intestinal parasites in a protectedpopulation of Ateles belzebuth chamek. Fecal samples were collected from 34 individuals in three social groups from one population at the Cocha Cashu Biological Station in Manu National Park, Peru. The samples were fixed in formalin (10%, 60 ºC) and analyzed by the Direct method and the Ritchie test for helminths. For protozoans, the samples were preserved in polyvinyl alcohol fixative (PVA) and were smeared and then stained with Tricrómica de Gomori. Laboratory analysis revealed that 76,4% (26/34) sampled individuals had parasites. Results included the identification of larvae or eggs of Strongyloides, Trichuris, Trypanoxyuris, strongyloid type, and one trematode of the Dicrocoeliidae, but not one species of protozoan.