The summit rat (Rattus baluensis) is a species of rodent in the family Muridae.

[5] With current predictions of Global warming, the suitable habitat for Rattus baluensis is expected to shift around 500 m upwards.

[5] Genetic analysis situate its origin in a local population of Rattus tiomanicus from northern Borneo at around 300-400 thousand years ago.

[3] The summit rat has a mutualistic relationship with a species of giant pitcher plant, Nepenthes rajah.

Like the treeshrew Tupaia montana, it defecates into the plant's traps while visiting them to feed on sweet, fruity secretions from glands on the pitcher lids.