Piliocolobus semlikiensis is a red colobus reported from forests in the Democratic Republic of the Congo. Known observations come from terra firma and swamp forests and river margins.
It has a red tuft on the crown and a dark face, with red hair on the throat, cheek whiskers, and sides of the head. Its back and legs are grayish orange.
The IUCN account says all known observations are from forest habitats: terra firma, swamp forest, and river margins. It also reports that the animals live in groups.
An extinction-risk assessment has not been added yet.