Phrynobatrachus rillingi, new large puddle frog in which males are more than 30 mm in snout-vent-length, is described from the montane areas of the Nyambene Hills, Meru County in Kenya. Some of the key morphological characters include; having extensive pedal webbing, breeding males with nuptial pads or swollen thumbs and femoral glands. The new species is only known from museum specimens that are more than 50 years old, and there is need for fieldwork and more phylogenetic work.