Eophis is an early genus of stem-snake (clade Ophidia)[1] containing one species, Eophis underwoodi, from the Middle Jurassic (Bathonian) from the Forest Marble Formation of United Kingdom.

It is known from a fragmentary dentary from Kirtlington Quarry.

The placement of Eophis as a stem snake was re-affirmed by subsequent analyses.

[2] Cladogram based in the phylogenetic analysis by Caldwell et al. (2015):[1] Portugalophis Parviraptor Eophis Unnamed sp.

Diablophis Dinilysia Madtsoiidae Najash Coniophis Serpentes (Modern snakes)