Nycticebus borneanus is a slow loris of central and southern Borneo, in Indonesian Kalimantan. EAZA material records an observation in dipterocarp forest in a protected forest area and describes its dark facial markings.
It has a dark mask around the eyes. The upper eye patch is rounded and diffuse, its ears are furred, and its coat is long and fluffy.
An observation in Bukit Batikap Protected Forest, Kalimantan, records the species in dipterocarp forest.
An extinction-risk assessment has not been added yet.