Prosthennops is a genus of extinct peccaries that lived in North and Central America between the middle Miocene and lower Pliocene (around 15-5 million years ago).

It possessed a robust skull, with a depressed and elongated snout (but to a lesser extent than other extinct peccaries such as Mylohyus).

[3] Prosthennops is found in a 12-million-year-old stratum of the lagerstätten Ashfall Fossil Beds, predating the ash layer.

A number of species, including P. condoni, P. kernensis, P. niobrarensis, P. rex, P. xiphodonticus, P. ziegleri, and P. haroldcooki, have been ascribed to the genus Prosthennops in much of the western United States (but also in Alabama and Mexico).

It was then Edwin Colbert, in 1935, who recognised in these teeth a typical representative of the taiassuids, and thus re-attributed the fossils to the genus Prosthennops.