Arctocyonians are a clade of Ferungulata mammals whose stratigraphic range runs from the Early Paleocene to the Early Eocene epoch. While some classify arctocyonians as stem-artiodactyls, others have classified the group as members of Ferae. There are three families classified in the order: Arctocyonidae, Oxyclaenidae, and Quettacyonidae.