Carpathichthys ("Carpathian fish") is an extinct genus of prehistoric slickhead fish from the Oligocene. It contains a single species, C. polonicus, from the Menilite Formation in the Carpathian Flysch Belt of Poland, in what was formerly the Paratethys Sea.^[1][2]

It is one of the very few known fossil slickheads, a group of ray-finned fishes that are assumed to have ancient origins, but have almost no presence in the geological record, likely due to their preference for deep-water habitats.^[3] The only other known fossil slickhead is an indeterminate member of Bathyprion from the same formation, indicating that it was likely deposited in an abyssal habitat.^[2][4]Carpathichthys appears to be closely related to the extant genus Rouleina.^[2]

• Prehistoric fish
• List of prehistoric bony fish

• Bony fish in the online Sepkoski Database