The Mount Oku rat (Lamottemys okuensis) is a species of rodent in the family Muridae.

The dorsal fur is glossy and soft, dark brownish-black tinged with russet, with no stripe along the spine.

[3] This rat is endemic to Cameroon in West Africa where it is only known from the forested slopes of Mount Oku at altitudes of between 2,100 and 3,000 m (6,890 and 9,843 ft) in areas with thorn-bushes, dense undergrowth and rough vegetation.

One female captured in the dry season (January) contained a single developing embryo, so litter sizes may be low.

[3] This rat has a limited range, its total area of occupancy being about 500 km2 (193 sq mi), with all the population being located on the forested slopes of Mount Oku.