Dimacrodon is an extinct genus of non-mammalian synapsid from the latest Early Permian San Angelo Formation of Texas.

It is distinguished by toothless, possibly beaked jaw tips, large lower canines and a thin bony crest on top of its head.

[2] Unusually, the front of the jaw is toothless and has a rough bone texture, possibly supporting a beak like in dicynodonts, with no pre-canine teeth.

[2] Olson and Beerbower tentatively assigned Dimacrodon to Therapsida in 1953 (along with other unusual synapsids from the San Angelo Formation) due to its therapsid-like teeth and general resemblance to various therapsids.

[1] Olson later provided a more definitive classification in 1962 when he assigned it to Anomodontia, specifically to the infraorder Venyukovioidea, and erected its own monogeneric family, the Dimacrodontidae.

[6][7] In the upper San Angelo Formation, Dimacrodon co-existed with and was found alongside the abundant giant herbivorous caseid Cotylorhynchus, along with the captorhinid Rothianiscus and similarly enigmatic synapsid Tappenosaurus.

The upper San Angelo Formation has been interpreted as a near-shore terrestrial environment, cut by numerous channels and experiencing periods of flooding, during which the bones of Dimacrodon were likely deposited.