The Mountain Reedbuck averages 75 centimetres at the shoulder, and weighs around 30 kilogrammes. It has a grey coat with a white underbelly and reddish-brown head and shoulders. The male has ridged horns of around 35 centimetres, which curve forwards.
The Mountain Reedbuck lives in thick mountainous forest, where it eats grasses and leaves. It forms herds of around five individuals, including a single mature male. Adolescent males are forced out of their herds and form small bachelor herds. In the dry season, the Mountain Reedbuck sometimes forms herds of up to thirty individuals. They are diurnal, but inactive during the heat of the day.