The Olive marsh snake (Natriciteres olivacea) is a species of snake of the family Colubridae.
This species is widely distributed throughout western and southern Africa, from Sudan in the north, south to Mozambique and westward to Guinea and Senegal (Spawls et al. 2002, Branch 1998, Razzetti and Msuya 2002)
This species occurs from sea level to an altitude of over 2,200 m (Spawls et al. 2002).