Protungulatum ('first ungulate') is an extinct genus of eutherian mammals within extinct family Protungulatidae,[2] and is possibly one of the earliest known placental mammals in the fossil record, that lived in North America from the Late Cretaceous to early Paleocene.

[6][3][7] Fossils of this genus were first found in the Bug Creek Anthills in northeastern Montana.

This genus was initially assigned to the family Arctocyonidae,[11] in order Condylarthra,[12][13] (a group of archaic "ungulates", that is now known to be polyphyletic).

[14][3][15][16] However, a number of studies consider it to be a placental mammal and stem relative to true ungulates in clade Pan-Euungulata,[17][18][19][20][7][21][22][10] based on anatomy of inner ear.

[17][20] Apo-Chiroptera †"Wyonycteris" microtis †Eosoricodontidae †Acmeodon †Gelastops Ferae Euungulata (sensu stricto) †Protungulatum coombsi †Protungulatum gorgun †Protungulatum donnae †Protungulatum mckeeveri †Protungulatum sloani †Protungulatum sp.