The Blue-masked Leafbird is a small bird of humid montane forest in the foothills of Sumatra. Males show violet-blue and deep indigo markings, while females have bright blue markings on the face and throat.
The plumage is green. Males have a violet-blue malar band, deep indigo face and ear-coverts, dark brown to blackish-brown chin and throat, and an orange breast edged yellow. Females have bright blue on the forehead, lores, ear-coverts, chin, and throat.
Its diet includes fruit, seeds, and arthropods. The account describes it as probably resident, not as a confirmed year-round resident.
An extinction-risk assessment has not been added yet.