Robert's river garfish (Zenarchopterus robertsi) is a species of viviparous halfbeak endemic to Papua New Guinea where it is only known from the area around Kokoda.

The Robert's river garfish is known to be found in a freshwater environment within a pelagic depth range.

[3][4][5] The Robert's river garfish can reach the maximum length of 13 centimeters or about 5.11 inches as an unsexed male.

[2][4] The distribution of the Robert's river garfish includes the areas of Kokoda in southeastern Papua New Guinea.

[2][4][6] The Robert's river garfish serves as no threat to humans and they are considered to be harmless.