The Mountain serpent eagle (Spilornis kinabaluensis), also known as the Kinabalu serpent eagle, is a species of bird of prey that is found in northern Borneo. It is found at altitudes of 1,000–4,100 metres (3,300–13,500 ft) in forest, especially where it becomes stunted. Where their range overlaps, the crested serpent eagle generally occurs at lower altitudes. The mountain serpent eagle is darker than the Bornean subspecies of the crested serpent eagle.