Two new species of montane, torrent-dwelling toads of the genus Ansonia from Fraser's Hill and Sungai Lembing, Pahang, West Malaysia are described based on morphological and color pattern characteristics. The new species from Sungai Lembing most closely resembles A. leptopus of Borneo but differs from it in numerous aspects of its mandibular asperites, degree of toe webbing, presence of warts at the angle of the jaw, size of tubercles around the tympanum, having an inner metatarsal tubercle, lacking rows of tubercles on the back, having paired vocal slits, and having a light dorsal spot between the scapulae. The new species from Fraser's Hill most closely resembles A. malayana but differs from it in its greater degree of dorsal tuberculation, more webbing on the third and fifth toes and less webbing on the first and fourth toes, and various aspects of coloration. Finally, we express the importance of continuing to conduct montane surveys in remote areas as well as in those areas that are considered to be well-studied.