Kabenau River (also Gabina or St. Augustin River) is a river in Madang Province, Papua New Guinea. It is located at about {{coord|5.466667|S|145.85|E}}. It was discovered in 1887 by geologist C. Schneider and explored in 1888 by Hugo Zöller. It flows westward and empties near Rimba to the Astrolabe Bay.