Elonichthys is an extinct genus of prehistoric freshwater ray-finned fish known from the late Paleozoic.

[1][2] The genus sensu stricto contains three species known from the latest Carboniferous to the earliest Permian of freshwater ecosystems of Europe, but as a former wastebasket taxon, it contains many more dubiously-classified species from the Carboniferous and Permian of Europe, Greenland, South Africa, and North America.

[2][3] The following are species within Elonichthys sensu stricto:[2][3][4] The following are more dubious species that were formerly classified into this genus.

However, the majority have been found to no longer even be members of Elonichthyidae.

This article about a prehistoric ray-finned fish is a stub.