Rhinesuchus (meaning "rasp crocodile" for the ridged surface texture on its skull bones) is a large temnospondyl.

Remains of the genus are known from the Permian of the South African Karoo Basin's Tapinocephalus and Cistecephalus assemblage zones, both belonging to the Beaufort Group.

The skull of Rhinesuchus had a flat triangular shape with blunt snout similar to some of the other large temnospondyls, and had a palate filled with small sharp teeth, suggesting that it hunted fish.

The name Rhinesuchus comes from Greek ῥίνη (rhinē) "file, rasp" plus σούχος (soukhos) "crocodile" for the skull surface texture: "The upper cranial bones are ornamented by a rather fine reticulation of sharp ridges".

[2] Counts of lines of arrested growth (LAG) indicate that like many amphibians, Rhinesuchus grew seasonally and was able to live more than 30 years.