The gray tree rat (Lenothrix canus) is a species of rodent in the family Muridae.

The gray tree rat was first described by the American zoologist Gerrit Smith Miller Jr. as Lenothrix canus in 1903.

Molecular data suggests that it is closely related to the white-bellied rats Niviventer, but is widely diverged from Maxomys, and its phylogenetic affinities are unclear.

It has many primitive morphological, cranial and dental features and may have diverged from the core murine lineage at an early stage.

[4] L. canus is a common species, tolerant of disturbance to its habitat and able to live in secondary forest and rubber plantations.