The nominate subspecies of the gray-cheeked mangabey is recorded from Cameroon’s Atlantic coast to central Uganda. It mainly eats fruit, along with leaves, flowers, and animal matter.
The nominate subspecies has gray fur, sometimes with a pale fawn tone on the mantle. Its crown hair is long and shaggy; the short cheek hair mixes whitish and black hairs.
The nominate subspecies inhabits dense evergreen and swamp forests. Fruit is its main food, supplemented by leaves, flowers, and animal matter.
An extinction-risk assessment has not been added yet.