Leptomys paulus is a small rodent recorded in the mountains of southeastern New Guinea. It has a long tail and long, very soft dark tawny-brown fur on its back.
The back and rump are dark tawny brown, while the sides, thighs, and upper arms are buffy. The dorsal coat is long and described as very soft and silky.
The species account says it inhabits forests and identifies its collection sites with tropical lower montane rainforest.
An extinction-risk assessment has not been added yet.