Oloplotosus is a genus of eeltail catfishes endemic to the island of New Guinea.

[2] Otoplotosus species grow to about 15.0–20.0 centimetres (5.9–7.9 in) SL.

[3][4][5] O. luteus occurs mostly from moderate to fast-flowing, gravel-boulder bottom creeks in mountainous tributaries of the Ok Tedi River.

[3] O. mariae occurs in clear, rocky streams in deeper pools, usually in hilly or mountainous terrain.

[4] O. torobo is known only from the type locality; specimens were captured in 1983 from shallow water with a soft, muddy bottom and abundant aquatic vegetation.