The New Guinea Quoll is widespread throughout much of New Guinea (Indonesia and Papua New Guinea), but has a patchy distribution across its range. It has a wide elevational range (sea level to 3,600 m), most often occurring 1,000-1,300 m asl; it is absent from the south-western lowlands (Flannery 1995). It is not certain if the species occurs in the Vogelkop region of Papua, although the map is drawn to include that area. The New Guinea Quoll is also found on Yapen Island.