Daeodon is an extinct genus of entelodont even-toed ungulates that inhabited North America about 29 to 15.97 million years ago during the latest Oligocene and earliest Miocene.

[3] This classification persisted until the description of "Elotherium" calkinsi in 1905,[4] a very similar and much more complete animal from the same rocks, which was promptly assigned as a species of Dynohyus by Peterson (1909).

[6] However, the existence of distinct specimens of Archaeotherium showing characters reminiscent of those present in both Paraentelodon and Daeodon raises the possibility of both genera actually descending from a North American common ancestor.

[6] That same year, an obscure entelodont, Boochoerus humerosum, was also synonymized to Daeodon by Foss and Fremd (1998) and, albeit its status as a distinct species was retained, they note that the differences could still be attributed to individual or population variation or sexual dimorphism.

[5][6] It also had a relatively lightly constructed neck for the size of its head, whose weight was mostly supported by muscles and tendons attached to the tall spines of the thoracic vertebrae, similar to those of modern-day bison and white rhinoceros.

[16] It adapted to the grassland with a more cursorial body plan than more basal entelodonts like Archaeotherium, losing their dewclaws entirely, proximally fused metacarpals, and similar shoulder musculature to bison.

The rhinos suffered massive periodic die-offs in the dry season, but Daeodon fossils are rare, which suggests they were neither social animals nor especially attracted to carrion.

If dimorphic, the function of the expanded jugals was likely for display, supporting large preorbital glands similar to those forest hogs possessed for chemical communication.