Chionobathyscus dewitti is a species of marine ray-finned fish belonging to the family Channichthyidae, the crocodile icefishes.

Chionobathyscus was first described as a genus in 1978 by the ichthyologists Anatoly Petrovich Andriyashev and Alexei Vladimovich Neyelov[1] when they were describing the only species in this genus Chionobathyscus dewitti, the type of which had been collected in the Eastern Antarctic Ocean at 67°31'S, 33°05'W.

[2] The genus name is a compound of chionos which means "snow", although in this case this is alluding to the relationship of this taxon with the genus Chionodraco, and bathyscus which means "inhabitant of the deep", a reference to the depths at which this species is found.

The specific name honours the American ichthyologist, marine biologist and oceanographer Hugh Hamilton DeWitt in recognition of his work on Antarctic fishes.

[5] Chionobathyscus dewitti is found in the Southern Ocean and is probably circum-Antarctic on the continental shelf and slope.