Sphenofontis is an extinct genus of sphenodontian reptile known from the Late Jurassic of Germany, with a single known species, S. velserae.

It is known from a single nearly complete and articulated sub-adult specimen (SNSB-BSPG 1993 XVIII 4), found in the late Kimmeridgian aged Torleite Formation in Brunn quarry in Bavaria, Southern Germany.

[1] Sphenofontis does not display any evident specialization in its dentition, which was therefore most likely adapted to a generalist carnivorous/insectivorous diet comparable with that of the extant Sphenodon.

The overall cranial and postcranial morphology lacks any clear adaptation towards an aquatic or semiaquatic mode of life, thus indicating that Sphenofontis lived in the terrestrial ecosystems of the islands.

[2] In this environment, the crocodylomorphs Alligatorium, Dakosaurus and Cricosaurus, the small theropod Sciurumimus, the turtle Eurysternum and a lot of fishes lived with Sphenofontis.