Leptomys paulus is a small rodent belonging to the family Muridae endemic to New Guinea.

It can weigh up to 52 g. Its thick and soft fur is dark reddish brown on dorsal parts, yellowish on its sides and grayish white on the ventral parts.

There is a hairless strip of skin that extends from the middle of the shoulders towards the forehead.

It has long whiskers (60 mm) and white cheeks with a darker colour around the eyes.

[2] The species has been observed in the tropical low-montane regions of eastern New Guinea, between 1,240 and 1,540 m.[2] Data related to Leptomys paulus at Wikispecies