The giant naked-tailed rat (Uromys anak) is a species of rodent in the family Muridae.

It is known as abben in the Kalam language of Papua New Guinea.

Its fur is typically short and rough, varying in colour from grey to various shades of brown and black, with its underside being white or grey.

Its tail is longer than its body and is uniformly black, with the basal part densely covered with reddish hairs.

The species has been known to eat karuka nuts (Pandanus julianettii),[3] and growers will put platforms or other obstacles on the trunks of the trees to keep the pests out.