Infernovenator is a genus of Carboniferous lysorophian recumbirostran from the Mazon Creek lagerstätte in Illinois, U.S.

[1] The holotype, now reposited at the Field Museum, was previously described by Godfrey (1997) as an aïstopod, Phlegethontia longissama.

The genus name is given for the Latin infernum ("hell") to refer to the fossorial habitats of the taxon and venator ("hunter").

Features shared with the lysorophian Brachydectes and not with other recumbirostrans include: (1) postorbital absent and cheek emargination present; (2) bar-like tabular-squamosal complex; and (3) short and robust dentary.

Below is the strict consensus topology recovered from the maximum parsimony analysis of Mann et al. (2019):[citation needed] Seymouria Limnoscelis Ophiacodon Dimetrodon Petrolacosaurus Captorhinus Opisthodontosaurus Nannaroter Micraroter Pelodosotis Huskerpeton Cardiocephalus Rhynchonkos Aletrimyti Dvellecanus Brachydectes Infernovenator Quasicaecilia Batropetes Carrolla