The rough-bellied day gecko (Cnemaspis tropidogaster) is a species of day geckos found in the Western Ghats of India and Sri Lanka. Its distribution in the southern Western Ghats is patchy and relatively uncommon. It is active during the day. It has a distinct head, elongated snout, and keeled ventral scales; Its dark-brown dorsal side has transverse arrangement of light and dark variegations. It is pale brown/cream on its underside with spiny tubercles on its sides. Males have two to four preanal and three to six femoral pores.