Chitwan National Park (CNP) is situated in the south-central subtropical lowlands of the inner Terai of Nepal. From 2002 to 2008, I collected snakes in areas bordering the CNP. I also received preserved specimens and photographs of snakes from some residents in the area. I recorded 26 species belonging to 20 genera. Of the 26 species, 12 were nonvenomous species, five were mildly venomous (four back-fanged), and nine were venomous (eight front-fanged). Oligodon kheriensis was previously known from two specimens only; from Kheri Division, Uttar Pradesh, India and Mahendranagar, western Nepal. This record extends the known range of this rare species about 350 km east of its type locality.