The northern common cuscus (Phalanger orientalis), also known as the gray cuscus, is a species of marsupial in the family Phalangeridae native to northern New Guinea and adjacent smaller islands, but is now also found in the Bismarck Archipelago, southeast and central Moluccas, the Solomons, and Timor, where it is believed to have been introduced in prehistoric times from New Guinea.

The northern common cuscus normally inhabits disturbed habitats.

[2] While living in the arboreal environments, hunters in the area believe that the tree hollows are the preferred den site of the cuscus.

[7] Local villagers reported that the northern common cuscus can be found in any substantially forested areas from coastal monsoon rainforest and gallery forest to the remnant montane rainforest.

[4] Generally, its niche is thought to be that of a nocturnal arboreal folivore with frugivorous tendencies.