The Uganda mangabey (Lophocebus ugandae) is a species of Old World monkey found only in Uganda. This crested mangabey was previously thought to be just be a population of the grey-cheeked mangabey (L. albigena). Colin Groves upgraded the Ugandan population into the new species L. ugandae on February 16, 2007. This species is dramatically smaller than the grey-cheeked mangabey, with a shorter skull and smaller face.