The southern white-cheeked gibbon lives in forests of central Laos and Vietnam. It stays in the canopy, and its diet changes with the seasons.
Adult males have black fur and white cheek patches that extend around the mouth. Females can be difficult to distinguish from females of related gibbons.
It is reported to eat more fruit in the wet season and more young leaves in the dry season. The balance of foods changes with the season.
An extinction-risk assessment has not been added yet.