Cleithrolepis is an extinct genus of ray-finned fish from the Triassic. The genus grew to about 30 centimetres (12 in) long. It had a weak lower jaw with teeth only at the tip. Cleithrolepis lived in rivers, billabongs and lakes in the large braided river system that deposited the Hawkesbury Sandstone in what is now New South Wales, with fossils found in shale lenses within the sandstone.