Nyctimystes sauroni is a species of tree frog and an endemic to Papua New Guinea[2] Scientifically, it is in the subfamily Pelodryadinae.

It is Scientists know it solely from the Kikori Integrate Conservation and Development Project area.

The species epithet sauroni refers to the red and black mottled eye of The Lord of the Rings character Sauron.

[4] Scientists currently disagree about whether this frog is best placed in the genus Litoria or Nyctimystes.

[3][5] This frog has red-and-black eyes and nuptial pads on its front feet.