The northern common cuscus (Phalanger orientalis), also known as the grey 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, south-east and central Moluccas, the Solomons and Timor, where it is believed to have been introduced in prehistoric times. It was formerly considered conspecific with the allopatric P. intercastellanus and P. mimicus.