The Oenpelli python, known in binomial nomenclature as Morelia oenpelliensis or Simalia oenpelliensis, is a large python species endemic to the sandstone massif area of the western Arnhem Land region in the Northern Territory of Australia. No subspecies are recognised. Like all pythons, it is a non-venomous constrictor. It has been called the rarest python in the world. Two notable characteristics of the species are the unusually large size of its eggs and its ability to change colour.